Pub Date : 2025-04-23DOI: 10.1016/j.jlumin.2025.121275
Zixin Pan , Sisi Liang , Zihao Wang , Wendong Nie , Chenyang Zhan , Le Liu , Jinhao Chang , Fulin Lin , Haomiao Zhu
Currently, near-infrared (NIR) phosphors have been applied in many emerging fields, therefore, there is an urgent need to investigate the high-efficiency broadband NIR phosphors with different emission wavelengths to meet the demands of widespread applications. However, the bottleneck of relatively low photoluminescence quantum yield (PL QY) has significantly constrained the performance of NIR phosphors. Herein, an efficient Na0.6Al0.8Nb1.2(PO4)3:Cr3+ (NANP:Cr3+) phosphor with 815 nm NIR emission was successfully synthesized. Moreover, the achieved external PL QY is up to 53.9 % under 460 nm blue-light excitation by the proper introduction of Yb3+. A NIR phosphor-converted light-emitting diode (NIR pc-LED) is fabricated by using the NANP:Cr3+,Yb3+ phosphor and a 460 nm blue diode chip. The photoelectric conversion efficiency is 28.8 % at 10 mA drive current. Furthermore, we demonstrate a new application using the encapsulated NIR pc-LED. Thanks to the excellent penetration ability of NIR light, so that demonstrating better performance in an environment where human vision is poor. The NIR pc-LED was successfully used as the lighting source for penetration in smoke and water mist, and the imaging ability suggests that the NIR phosphors can be used in the field of transportation and fire protection.
{"title":"Broadband NIR phosphor with high external quantum yield and application of smoke penetration imaging","authors":"Zixin Pan , Sisi Liang , Zihao Wang , Wendong Nie , Chenyang Zhan , Le Liu , Jinhao Chang , Fulin Lin , Haomiao Zhu","doi":"10.1016/j.jlumin.2025.121275","DOIUrl":"10.1016/j.jlumin.2025.121275","url":null,"abstract":"<div><div>Currently, near-infrared (NIR) phosphors have been applied in many emerging fields, therefore, there is an urgent need to investigate the high-efficiency broadband NIR phosphors with different emission wavelengths to meet the demands of widespread applications. However, the bottleneck of relatively low photoluminescence quantum yield (PL QY) has significantly constrained the performance of NIR phosphors. Herein, an efficient Na<sub>0.6</sub>Al<sub>0.8</sub>Nb<sub>1.2</sub>(PO<sub>4</sub>)<sub>3</sub>:Cr<sup>3+</sup> (NANP:Cr<sup>3+</sup>) phosphor with 815 nm NIR emission was successfully synthesized. Moreover, the achieved external PL QY is up to 53.9 % under 460 nm blue-light excitation by the proper introduction of Yb<sup>3+</sup>. A NIR phosphor-converted light-emitting diode (NIR pc-LED) is fabricated by using the NANP:Cr<sup>3+</sup>,Yb<sup>3+</sup> phosphor and a 460 nm blue diode chip. The photoelectric conversion efficiency is 28.8 % at 10 mA drive current. Furthermore, we demonstrate a new application using the encapsulated NIR pc-LED. Thanks to the excellent penetration ability of NIR light, so that demonstrating better performance in an environment where human vision is poor. The NIR pc-LED was successfully used as the lighting source for penetration in smoke and water mist, and the imaging ability suggests that the NIR phosphors can be used in the field of transportation and fire protection.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121275"},"PeriodicalIF":3.3,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-23DOI: 10.1016/j.jlumin.2025.121263
Y. Tuncer Arslanlar , K. Bulcar , S. Akça-Özalp , Abeer S. Altowyan , Jabir Hakami , U.H. Kaynar , M. Topaksu , N. Can
This study systematically explores the thermoluminescence (TL) properties of Sm3+-doped LaCa4O(BO3)3 (LaCOB) phosphors, with emphasis on the effects of doping concentration, beta irradiation dose, and heating rate. The LaCOB host matrix, composed of borate-based compounds, is recognized for its thermal stability and efficient energy transfer characteristics. TL measurements conducted at a heating rate of 2 °C/s revealed three well-defined glow peaks at ∼81, 138, and 298 °C, respectively. The most favorable TL intensity was obtained at a doping concentration of 0.5 wt%, beyond which concentration quenching effects became prominent. Dose-response analyses exhibited both linear and super-linear trends, indicating potential for broad-range dosimetric applications. A notable increase in the integrated TL glow curve area with increasing heating rate was observed, suggesting a suppression of non-radiative pathways, possibly due to efficient charge carrier trapping and recombination mechanisms. The material also demonstrated remarkable reusability and thermal stability across repeated irradiation–readout cycles, reinforcing its potential for reliable radiation dosimetry. Kinetic analyses conducted via Glow Curve Deconvolution (GCD) yielded activation energies in the range of 0.85–1.82 eV, confirming the presence of multiple trapping centers with stable thermal behavior.
{"title":"Energy trap dynamics and thermoluminescent behaviour of Sm3+-doped LaCa4O(BO3)3 under variable conditions","authors":"Y. Tuncer Arslanlar , K. Bulcar , S. Akça-Özalp , Abeer S. Altowyan , Jabir Hakami , U.H. Kaynar , M. Topaksu , N. Can","doi":"10.1016/j.jlumin.2025.121263","DOIUrl":"10.1016/j.jlumin.2025.121263","url":null,"abstract":"<div><div>This study systematically explores the thermoluminescence (TL) properties of Sm<sup>3+</sup>-doped LaCa<sub>4</sub>O(BO<sub>3</sub>)<sub>3</sub> (LaCOB) phosphors, with emphasis on the effects of doping concentration, beta irradiation dose, and heating rate. The LaCOB host matrix, composed of borate-based compounds, is recognized for its thermal stability and efficient energy transfer characteristics. TL measurements conducted at a heating rate of 2 °C/s revealed three well-defined glow peaks at ∼81, 138, and 298 °C, respectively. The most favorable TL intensity was obtained at a doping concentration of 0.5 wt%, beyond which concentration quenching effects became prominent. Dose-response analyses exhibited both linear and super-linear trends, indicating potential for broad-range dosimetric applications. A notable increase in the integrated TL glow curve area with increasing heating rate was observed, suggesting a suppression of non-radiative pathways, possibly due to efficient charge carrier trapping and recombination mechanisms. The material also demonstrated remarkable reusability and thermal stability across repeated irradiation–readout cycles, reinforcing its potential for reliable radiation dosimetry. Kinetic analyses conducted via Glow Curve Deconvolution (GCD) yielded activation energies in the range of 0.85–1.82 eV, confirming the presence of multiple trapping centers with stable thermal behavior.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121263"},"PeriodicalIF":3.3,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-22DOI: 10.1016/j.jlumin.2025.121272
Jianjun Fang , Yiquan Wang , Guoliang Chen , Jianzhong Fan , Lili Lin , Chuan-Kui Wang , Kai Zhang
Multiple resonance (MR) type thermally activated delayed fluorescence (TADF) molecules are attracting attention for their narrowband emission, high luminescence efficiency, and high exciton utilization rate. Designing and studying these molecules has become an important direction for developing organic electroluminescent devices. Despite the significant potential in practical applications, developing long-wavelength emitting MR-TADF molecules remains a major challenge. This paper employs quantum mechanics/molecular mechanics (QM/MM) methods and the thermal vibration correlation function (TVCF) theory to study the luminescent properties of two MR-TADF molecules, asymmetric donor BNIP-tBuCz and symmetric donor BNDIP, in doped thin films. The calculations reveal that both molecules, while maintaining MR characteristics, possess small HOMO and LUMO energy gaps, enabling long-wavelength emission. Compared to BNIP-tBuCz, BNDIP has a slightly higher degree of conjugation and a greater proportion of π-π∗ transitions. Additionally, the transition dipole moment density and transition dipole moment in BNDIP are significantly enhanced, increasing the radiative rate. Both BNIP-tBuCz and BNDIP maintain similar porosity in thin films; however, BNIP-tBuCz is more sensitive to the aggregated environment. Stronger intermolecular interactions in BNDIP effectively suppress out-of-plane methyl wagging vibrations in low-frequency modes and C=C stretching vibrations in high-frequency modes, reducing reorganization energy and inhibiting the loss of non-radiative energy in the excited state. Furthermore, BNDIP's smaller energy gap between T1 and S1 (ΔEST) and its reorganization energy facilitate a faster reverse intersystem crossing rate (kRISC). Energy transfer characteristics are also studied using the semi-empirical Marcus theory. The calculated energy transfer rates of singlet and triplet states in BNIP-tBuCz are greater than those in BNDIP, due to the larger Gibbs free energy and exciton coupling in BNIP-tBuCz. The calculations reveal the relationship between the molecular structure and luminescent performance of these two novel MR-TADF materials, providing a theoretical basis for designing and developing highly efficient, long-wavelength MR-TADF devices.
{"title":"Theoretical perspective for carbazole fusion effect on multiple resonance thermally activated delayed fluorescent properties","authors":"Jianjun Fang , Yiquan Wang , Guoliang Chen , Jianzhong Fan , Lili Lin , Chuan-Kui Wang , Kai Zhang","doi":"10.1016/j.jlumin.2025.121272","DOIUrl":"10.1016/j.jlumin.2025.121272","url":null,"abstract":"<div><div>Multiple resonance (MR) type thermally activated delayed fluorescence (TADF) molecules are attracting attention for their narrowband emission, high luminescence efficiency, and high exciton utilization rate. Designing and studying these molecules has become an important direction for developing organic electroluminescent devices. Despite the significant potential in practical applications, developing long-wavelength emitting MR-TADF molecules remains a major challenge. This paper employs quantum mechanics/molecular mechanics (QM/MM) methods and the thermal vibration correlation function (TVCF) theory to study the luminescent properties of two MR-TADF molecules, asymmetric donor BNIP-tBuCz and symmetric donor BNDIP, in doped thin films. The calculations reveal that both molecules, while maintaining MR characteristics, possess small HOMO and LUMO energy gaps, enabling long-wavelength emission. Compared to BNIP-tBuCz, BNDIP has a slightly higher degree of conjugation and a greater proportion of π-π∗ transitions. Additionally, the transition dipole moment density and transition dipole moment in BNDIP are significantly enhanced, increasing the radiative rate. Both BNIP-tBuCz and BNDIP maintain similar porosity in thin films; however, BNIP-tBuCz is more sensitive to the aggregated environment. Stronger intermolecular interactions in BNDIP effectively suppress out-of-plane methyl wagging vibrations in low-frequency modes and C=C stretching vibrations in high-frequency modes, reducing reorganization energy and inhibiting the loss of non-radiative energy in the excited state. Furthermore, BNDIP's smaller energy gap between T<sub>1</sub> and S<sub>1</sub> (ΔE<sub>ST</sub>) and its reorganization energy facilitate a faster reverse intersystem crossing rate (k<sub>RISC</sub>). Energy transfer characteristics are also studied using the semi-empirical Marcus theory. The calculated energy transfer rates of singlet and triplet states in BNIP-tBuCz are greater than those in BNDIP, due to the larger Gibbs free energy and exciton coupling in BNIP-tBuCz. The calculations reveal the relationship between the molecular structure and luminescent performance of these two novel MR-TADF materials, providing a theoretical basis for designing and developing highly efficient, long-wavelength MR-TADF devices.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121272"},"PeriodicalIF":3.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-22DOI: 10.1016/j.jlumin.2025.121271
Yulong Zhu , Chao Li , Jinhao Zang , Guangsong Zheng , Yang Nan , Xiaofan Xia , Zhichao Zhu , Guoqin Cao , Junhua Hu , Jinyang Zhu
Carbon dots (CDs) exhibit certain limitations in terms of afterglow emission intensity and water stability. Here, we present a strategy to enhance and stabilize the afterglow emission of CDs by sequentially modifying seed CDs with urea and 3-aminopropyltriethoxysilane. Compared to urea-modified CDs, the afterglow intensity of uCDs@SiO2 was significantly enhanced by 25-fold, with the afterglow brightness increasing from 5.51 to 50.93 cd/m2 under 5-W illumination. More importantly, after calcination at 200 °C, uCDs@SiO2 retain approximately 76 % of their initial afterglow emission intensity in water solution over an 8-h period. This retention is attributed to a dense SiO2 matrix that mitigates oxygen-related surface defects and restricts non-radiative decay pathways. Finally, leveraging this robust afterglow, we demonstrate time-delay light-emitting diodes that continue to glow after power-off, as well as an information-encryption method based on selective quenching.
{"title":"Enhanced afterglow performance of carbon dots via surface modification engineering","authors":"Yulong Zhu , Chao Li , Jinhao Zang , Guangsong Zheng , Yang Nan , Xiaofan Xia , Zhichao Zhu , Guoqin Cao , Junhua Hu , Jinyang Zhu","doi":"10.1016/j.jlumin.2025.121271","DOIUrl":"10.1016/j.jlumin.2025.121271","url":null,"abstract":"<div><div>Carbon dots (CDs) exhibit certain limitations in terms of afterglow emission intensity and water stability. Here, we present a strategy to enhance and stabilize the afterglow emission of CDs by sequentially modifying seed CDs with urea and 3-aminopropyltriethoxysilane. Compared to urea-modified CDs, the afterglow intensity of uCDs@SiO<sub>2</sub> was significantly enhanced by 25-fold, with the afterglow brightness increasing from 5.51 to 50.93 cd/m<sup>2</sup> under 5-W illumination. More importantly, after calcination at 200 °C, uCDs@SiO<sub>2</sub> retain approximately 76 % of their initial afterglow emission intensity in water solution over an 8-h period. This retention is attributed to a dense SiO<sub>2</sub> matrix that mitigates oxygen-related surface defects and restricts non-radiative decay pathways. Finally, leveraging this robust afterglow, we demonstrate time-delay light-emitting diodes that continue to glow after power-off, as well as an information-encryption method based on selective quenching.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121271"},"PeriodicalIF":3.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-22DOI: 10.1016/j.jlumin.2025.121274
Yuqi Lei , Mengxue Zhang , Mengkun Zhang , Huixin Yu , Wenhui Tan , Zelin Mu , Chenyi Wang , Kai Sheng , Mubiao Xie , Ruijin Yu
In this study, a novel type of phosphor, YNb2VO9:xEu3+ (where x takes on the values of 0.5, 1, 2, 5, 10, 20, 30, 40, and 50 mol%), was synthesized through the high-temperature solid-state method. The phase purity, particle morphology, and optical properties were studied in a systematic manner. The synthesized fluorescent materials displayed high phase purity and matched the target compounds very well. The excitation spectrum of YNb2VO9:Eu3+ showed an optimal excitation wavelength at 291 nm. Observations of the emission spectrum revealed four distinct peaks, with the most prominent peak appearing at 619 nm, corresponding to the 5D0→7F2 radiative transition of Eu3+ ions. The YNb2VO9:5 mol%Eu3+ specimen was found to exhibit the most optimal optical performance despite different doping concentrations. Nearest neighbor ion interactions cause the concentration quenching effect. Notably, within the temperature range of 300–480 K, the phosphors exhibit an abnormal thermal quenching behavior alongside a substantial activation energy barrier Ea = 0.63 eV. Simultaneously, the produced white light-emitting diode (w-LED) exhibited a commendable color rendering index (Ra = 88.1), satisfactory correlated color temperature (CCT = 4553 K), and CIE chromaticity coordinates (0.345, 0.361). Moreover, latent fingerprints (LFPs) images may be displayed by YNb2VO9:5 mol%Eu3+ phosphors. The high resolution and contrast of fingerprints facilitate the recognition of level I-III features. The above experimental findings indicated that YNb2VO9:Eu3+ phosphors possessed outstanding luminescence properties and extensive application prospects.
{"title":"The application of w-LEDs and latent fingerprint visualization with a newly developed reddish-orange YNb2VO9:Eu3+ phosphor","authors":"Yuqi Lei , Mengxue Zhang , Mengkun Zhang , Huixin Yu , Wenhui Tan , Zelin Mu , Chenyi Wang , Kai Sheng , Mubiao Xie , Ruijin Yu","doi":"10.1016/j.jlumin.2025.121274","DOIUrl":"10.1016/j.jlumin.2025.121274","url":null,"abstract":"<div><div>In this study, a novel type of phosphor, YNb<sub>2</sub>VO<sub>9</sub>:<em>x</em>Eu<sup>3+</sup> (where <em>x</em> takes on the values of 0.5, 1, 2, 5, 10, 20, 30, 40, and 50 mol%), was synthesized through the high-temperature solid-state method. The phase purity, particle morphology, and optical properties were studied in a systematic manner. The synthesized fluorescent materials displayed high phase purity and matched the target compounds very well. The excitation spectrum of YNb<sub>2</sub>VO<sub>9</sub>:Eu<sup>3+</sup> showed an optimal excitation wavelength at 291 nm. Observations of the emission spectrum revealed four distinct peaks, with the most prominent peak appearing at 619 nm, corresponding to the <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub> radiative transition of Eu<sup>3+</sup> ions. The YNb<sub>2</sub>VO<sub>9</sub>:5 mol%Eu<sup>3+</sup> specimen was found to exhibit the most optimal optical performance despite different doping concentrations. Nearest neighbor ion interactions cause the concentration quenching effect. Notably, within the temperature range of 300–480 K, the phosphors exhibit an abnormal thermal quenching behavior alongside a substantial activation energy barrier <em>E</em><sub>a</sub> = 0.63 eV. Simultaneously, the produced white light-emitting diode (w-LED) exhibited a commendable color rendering index (<em>R</em><sub>a</sub> = 88.1), satisfactory correlated color temperature (CCT = 4553 K), and CIE chromaticity coordinates (0.345, 0.361). Moreover, latent fingerprints (LFPs) images may be displayed by YNb<sub>2</sub>VO<sub>9</sub>:5 mol%Eu<sup>3+</sup> phosphors. The high resolution and contrast of fingerprints facilitate the recognition of level I-III features. The above experimental findings indicated that YNb<sub>2</sub>VO<sub>9</sub>:Eu<sup>3+</sup> phosphors possessed outstanding luminescence properties and extensive application prospects.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121274"},"PeriodicalIF":3.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-20DOI: 10.1016/j.jlumin.2025.121261
Guanghui Li , Shuchen Liu , Xiang Liu, Linwei Zhang, Yi Zhang, Hua Zou, Hongyu Lu, Jianhua Zhang
Transition metal as an activator is susceptible to influences of external environment, which make it sensitive to temperature and enable it to be used as a thermometer. However, its excitation spectra could hardly extend to near-infrared (NIR) region, which restricts its application in the field of biology. Additionally, ratiometric thermometry based on dual luminescent bands suffers from a low reliability due to the impacts of optical dispersion. To overcome the above challenges, single band ratiometric thermometry is adopted, which can render the thermometer immune to optical dispersion, resulting in a high reliability. Meanwhile, Mn5+ activated K2BaCa(PO4)2 (KBCP) phosphor is successfully synthesized, whose excitation and emission are in the NIR region. The influence of the excitation light fluctuations can be excluded by monitoring and screening the excitation intensity. Under 970 and 806 nm excitation, its temperature sensing behaviors are investigated in the range of 300–480 K. The maximum relative sensitivity is 1.69 % K−1 at 413 K under 806 nm excitation. These results indicate that KBCP:Mn5+ phosphor is an excellent NIR thermometer and can achieve highly reliable measurement.
{"title":"Single band ratiometric thermometry of K2BaCa(PO4)2:Mn5+ phosphor with near infrared excitation and emission","authors":"Guanghui Li , Shuchen Liu , Xiang Liu, Linwei Zhang, Yi Zhang, Hua Zou, Hongyu Lu, Jianhua Zhang","doi":"10.1016/j.jlumin.2025.121261","DOIUrl":"10.1016/j.jlumin.2025.121261","url":null,"abstract":"<div><div>Transition metal as an activator is susceptible to influences of external environment, which make it sensitive to temperature and enable it to be used as a thermometer. However, its excitation spectra could hardly extend to near-infrared (NIR) region, which restricts its application in the field of biology. Additionally, ratiometric thermometry based on dual luminescent bands suffers from a low reliability due to the impacts of optical dispersion. To overcome the above challenges, single band ratiometric thermometry is adopted, which can render the thermometer immune to optical dispersion, resulting in a high reliability. Meanwhile, Mn<sup>5+</sup> activated K<sub>2</sub>BaCa(PO<sub>4</sub>)<sub>2</sub> (KBCP) phosphor is successfully synthesized, whose excitation and emission are in the NIR region. The influence of the excitation light fluctuations can be excluded by monitoring and screening the excitation intensity. Under 970 and 806 nm excitation, its temperature sensing behaviors are investigated in the range of 300–480 K. The maximum relative sensitivity is 1.69 % K<sup>−1</sup> at 413 K under 806 nm excitation. These results indicate that KBCP:Mn<sup>5+</sup> phosphor is an excellent NIR thermometer and can achieve highly reliable measurement.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121261"},"PeriodicalIF":3.3,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143854672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-19DOI: 10.1016/j.jlumin.2025.121260
Feng Gu, Zhaomin Cao, Yingzheng Liu, Di Peng
Polymer–ceramic pressure-sensitive paints (PC-PSPs) enable time-resolved pressure-field measurements with high spatial resolution. Their porous binder, formed by a large proportion of ceramic particles and a small amount of polymer, facilitates oxygen diffusion, ensuring a rapid response. However, the low polymer concentration in PC-PSPs leads to severe dynamic self-quenching of luminescence, which is further complicated by the microenvironment heterogeneity induced by the high concentration of ceramic particles. While these factors significantly deteriorate the static sensing performance of PC-PSPs, the underlying mechanisms remain poorly understood. To address this gap, this paper introduces a photophysical model for the quenching mechanism in PC-PSPs, considering the dynamic self-quenching effect and microenvironment heterogeneity. The proposed model is verified based on experimental results of PC-PSPs with varying polymer-to-ceramic particle ratios. The effects of dynamic self-quenching and microenvironment heterogeneity on pressure sensitivity, response time, and photodegradation are analyzed based on theoretical analysis and experimental results. The findings can provide valuable reference for the design and optimization of PC-PSPs.
{"title":"Luminophore self-quenching and microenvironment heterogeneity in polymer–ceramic pressure-sensitive paints","authors":"Feng Gu, Zhaomin Cao, Yingzheng Liu, Di Peng","doi":"10.1016/j.jlumin.2025.121260","DOIUrl":"10.1016/j.jlumin.2025.121260","url":null,"abstract":"<div><div>Polymer–ceramic pressure-sensitive paints (PC-PSPs) enable time-resolved pressure-field measurements with high spatial resolution. Their porous binder, formed by a large proportion of ceramic particles and a small amount of polymer, facilitates oxygen diffusion, ensuring a rapid response. However, the low polymer concentration in PC-PSPs leads to severe dynamic self-quenching of luminescence, which is further complicated by the microenvironment heterogeneity induced by the high concentration of ceramic particles. While these factors significantly deteriorate the static sensing performance of PC-PSPs, the underlying mechanisms remain poorly understood. To address this gap, this paper introduces a photophysical model for the quenching mechanism in PC-PSPs, considering the dynamic self-quenching effect and microenvironment heterogeneity. The proposed model is verified based on experimental results of PC-PSPs with varying polymer-to-ceramic particle ratios. The effects of dynamic self-quenching and microenvironment heterogeneity on pressure sensitivity, response time, and photodegradation are analyzed based on theoretical analysis and experimental results. The findings can provide valuable reference for the design and optimization of PC-PSPs.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121260"},"PeriodicalIF":3.3,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-18DOI: 10.1016/j.jlumin.2025.121259
V. Skuratov , O. Korolik , M. Mamatova , J. O’Connell , N. Kirilkin , A. Dauletbekova , A. Akilbekov
The optically stimulated luminescence in MgAl2O4 single crystals associated with defects produced by high energy (670 MeV) Bi ions with electronic stopping power Se = 36.6 keV/nm has been studied. Such energy loss is almost five times higher than the threshold for latent track formation in spinel, about 7.5 keV/nm. High resolution transmission electron microscopy (HRTEM) examination has revealed that ion tracks in the sub-surface layer of irradiated specimens retain a crystalline structure. Photoluminescence (PL) spectra from the near surface region were recorded during excitation at 355 nm, 473 nm and 532 nm using a laser confocal microscopy technique. It was found that PL spectra were always composed of broad overlapping bands positioned over the entire spectral range from the excitation wavelengths till 850 nm. It is suggested that such spectral composition might be due to a high concentration of antisite defects with large variation of the Mg/Al ratio in the disordered regions surrounding ion track cores. PL measurements on 23 MeV Ne (Se = 3.5 keV/nm) ion irradiated spinel, when no latent tracks are formed, have produced similar spectra as those for Bi ions. This indicates the same nature of defect-related luminescent centers formed at significantly different levels of electronic stopping power – below and above the threshold for latent track formation. The conclusion and findings may provide new insights for interpreting the optical spectra in this material.
{"title":"Photoluminescence and structural characterization of MgAl2O4 irradiated with swift Bi ions","authors":"V. Skuratov , O. Korolik , M. Mamatova , J. O’Connell , N. Kirilkin , A. Dauletbekova , A. Akilbekov","doi":"10.1016/j.jlumin.2025.121259","DOIUrl":"10.1016/j.jlumin.2025.121259","url":null,"abstract":"<div><div>The optically stimulated luminescence in MgAl<sub>2</sub>O<sub>4</sub> single crystals associated with defects produced by high energy (670 MeV) Bi ions with electronic stopping power S<sub>e</sub> = 36.6 keV/nm has been studied. Such energy loss is almost five times higher than the threshold for latent track formation in spinel, about 7.5 keV/nm. High resolution transmission electron microscopy (HRTEM) examination has revealed that ion tracks in the sub-surface layer of irradiated specimens retain a crystalline structure. Photoluminescence (PL) spectra from the near surface region were recorded during excitation at 355 nm, 473 nm and 532 nm using a laser confocal microscopy technique. It was found that PL spectra were always composed of broad overlapping bands positioned over the entire spectral range from the excitation wavelengths till 850 nm. It is suggested that such spectral composition might be due to a high concentration of antisite defects with large variation of the Mg/Al ratio in the disordered regions surrounding ion track cores. PL measurements on 23 MeV Ne (S<sub>e</sub> = 3.5 keV/nm) ion irradiated spinel, when no latent tracks are formed, have produced similar spectra as those for Bi ions. This indicates the same nature of defect-related luminescent centers formed at significantly different levels of electronic stopping power – below and above the threshold for latent track formation. The conclusion and findings may provide new insights for interpreting the optical spectra in this material.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121259"},"PeriodicalIF":3.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143854670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-18DOI: 10.1016/j.jlumin.2025.121251
Weiqing Wu , Yurong Xu , Xinyi Lin , Fazheng Huang , Ya-Nan Feng , Lizhen Zhang , Yan Yu , Lingyun Li
Fluorescence intensity ratio (FIR)-based optical thermometry, recognized for high reliability and rapid response, has emerged as a promising non-contact temperature sensing technology. This study focuses on enhancing the performance of Er3+/Yb3+ co-doped scheelite-type single crystals (NaY(WO4)2 and NaGd(WO4)2) for wide-range optical temperature sensing. By employing a spontaneous nucleation method, we synthesized single crystals with optimized doping concentrations (1 % Er3+/60 % Yb3+ for NYW and 3 % Er3+/70 % Yb3+ for NGW), achieving intense green upconversion (UC) emissions at 530 nm (2H11/2 → 4I15/2) and 552 nm (4S3/2 → 4I15/2). The single crystals exhibited high Yb3+→Er3+ energy transfer efficiencies of 11.02 % (NYW: 1 % Er3+, 60 % Yb3+) and 20.65 % (NGW: 3 % Er3+, 70 % Yb3+), enabling robust UC luminescence even under harsh conditions (pH = 1/13, 72 h) and thermal shocks (800 °C, 8 cycles). Temperature-dependent FIR analysis of thermally coupled energy levels (2H11/2 and 4S3/2) revealed linear ln(FIR) vs. 1/T relationships, with maximum relative sensitivities of 1.18 % K−1 (NYW) and 1.12 % K−1 (NGW) in 298–578 K. A prototype sensor utilizing NGW: 3 %Er3+, 70 %Yb3+ single crystal demonstrated practical feasibility across 80–780 K, eliminating fiber-optic requirements due to high UC efficiency. These results highlight scheelite-type single crystals as superior candidates for precision optical thermometry in extreme environments.
{"title":"Ultra-stable Er3+/Yb3+ Co-doped scheelite single crystals for wide-range fiber-free optical thermometry","authors":"Weiqing Wu , Yurong Xu , Xinyi Lin , Fazheng Huang , Ya-Nan Feng , Lizhen Zhang , Yan Yu , Lingyun Li","doi":"10.1016/j.jlumin.2025.121251","DOIUrl":"10.1016/j.jlumin.2025.121251","url":null,"abstract":"<div><div>Fluorescence intensity ratio (FIR)-based optical thermometry, recognized for high reliability and rapid response, has emerged as a promising non-contact temperature sensing technology. This study focuses on enhancing the performance of Er<sup>3+</sup>/Yb<sup>3+</sup> co-doped scheelite-type single crystals (NaY(WO<sub>4</sub>)<sub>2</sub> and NaGd(WO<sub>4</sub>)<sub>2</sub>) for wide-range optical temperature sensing. By employing a spontaneous nucleation method, we synthesized single crystals with optimized doping concentrations (1 % Er<sup>3+</sup>/60 % Yb<sup>3+</sup> for NYW and 3 % Er<sup>3+</sup>/70 % Yb<sup>3+</sup> for NGW), achieving intense green upconversion (UC) emissions at 530 nm (<sup>2</sup>H<sub>11/2</sub> → <sup>4</sup>I<sub>15/2</sub>) and 552 nm (<sup>4</sup>S<sub>3/2</sub> → <sup>4</sup>I<sub>15/2</sub>). The single crystals exhibited high Yb<sup>3+</sup>→Er<sup>3+</sup> energy transfer efficiencies of 11.02 % (NYW: 1 % Er<sup>3+</sup>, 60 % Yb<sup>3+</sup>) and 20.65 % (NGW: 3 % Er<sup>3+</sup>, 70 % Yb<sup>3+</sup>), enabling robust UC luminescence even under harsh conditions (pH = 1/13, 72 h) and thermal shocks (800 °C, 8 cycles). Temperature-dependent FIR analysis of thermally coupled energy levels (<sup>2</sup>H<sub>11/2</sub> and <sup>4</sup>S<sub>3/2</sub>) revealed linear ln(FIR) vs. 1/T relationships, with maximum relative sensitivities of 1.18 % K<sup>−1</sup> (NYW) and 1.12 % K<sup>−1</sup> (NGW) in 298–578 K. A prototype sensor utilizing NGW: 3 %Er<sup>3+</sup>, 70 %Yb<sup>3+</sup> single crystal demonstrated practical feasibility across 80–780 K, eliminating fiber-optic requirements due to high UC efficiency. These results highlight scheelite-type single crystals as superior candidates for precision optical thermometry in extreme environments.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121251"},"PeriodicalIF":3.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143854671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A series of chromophores, PyOMe, dPyOMe, and dPyAN, was designed to explore the enhancement of emission properties by incorporating pyrene into tetraphenylethene (TPE)-based aggregation-induced emission (AIE) luminogens. Emission quantum yield (Φ) measurements revealed that in 90 % water fraction H2O/THF solutions, PyOMe exhibited a Φ of 0.27, whereas dPyOMe and dPyAN displayed higher values of 0.36 and 0.44, respectively. The introduction of pyrene contributed to enhanced emission intensities by suppressing intramolecular rotations and increasing the radiative transition. Low-temperature studies at 77 K showed significant hypsochromic shifts in emission wavelengths, indicating the difference in molecular interactions between frozen single chromophores and aggregated states. Solid-state fluorescence quantum yields were also evaluated, with dPyAN thin film achieving a Φ of 0.48. The findings suggest that pyrene-functionalized TPE-based luminogens have strong potential for use in optoelectronic devices.
{"title":"Amplifying emission strength via incorporating pyrenes in tetraphenylethene-based AIE-luminogens","authors":"Jun-Wei Xu, Yi-Ting Ou, Men-Hsin Hsieh, Tzu-Yun Tseng, Chih-Hsien Chen","doi":"10.1016/j.jlumin.2025.121257","DOIUrl":"10.1016/j.jlumin.2025.121257","url":null,"abstract":"<div><div>A series of chromophores, <strong>PyOMe</strong>, <strong>dPyOMe</strong>, and <strong>dPyAN</strong>, was designed to explore the enhancement of emission properties by incorporating pyrene into tetraphenylethene (TPE)-based aggregation-induced emission (AIE) luminogens. Emission quantum yield (Φ) measurements revealed that in 90 % water fraction H<sub>2</sub>O/THF solutions, <strong>PyOMe</strong> exhibited a Φ of 0.27, whereas <strong>dPyOMe</strong> and <strong>dPyAN</strong> displayed higher values of 0.36 and 0.44, respectively. The introduction of pyrene contributed to enhanced emission intensities by suppressing intramolecular rotations and increasing the radiative transition. Low-temperature studies at 77 K showed significant hypsochromic shifts in emission wavelengths, indicating the difference in molecular interactions between frozen single chromophores and aggregated states. Solid-state fluorescence quantum yields were also evaluated, with <strong>dPyAN</strong> thin film achieving a Φ of 0.48. The findings suggest that pyrene-functionalized TPE-based luminogens have strong potential for use in optoelectronic devices.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"283 ","pages":"Article 121257"},"PeriodicalIF":3.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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