Pub Date : 2025-12-31DOI: 10.1016/j.jlumin.2025.121732
Shuai He , Shuang Zheng , Yubo Lin , Liangliang Zhang , Xuanli Wang , Xiaobo Yu , Qian Guan , Luomeng Chao , Jun Qiao , Yonghong Ma
Optical thermometry based on temperature-dependent luminescent parameters, such as the luminescent intensity ratio (LIR), offers non-contact operation and high resolution but often requires complex excitation systems. This study presents a broadband near-infrared (NIR)-emitting phosphor, Gd2.4Lu0.6Ga4AlO12 (GLGA): Cr3+, xYb3+, which can be directly excited by ambient light, thereby significantly simplifying the measurement setup by eliminating the need for an external light source. The material exhibits an emission spectrum covering 650–1050 nm and demonstrates remarkable temperature-dependent characteristics over the 303–483 K range. By leveraging energy transfer between Cr3+ and Yb3+ and their distinct thermal quenching behaviors, the LIR of Yb3+ to Cr3+ emission is established as a reliable temperature probe. A maximum relative sensitivity of 0.5 % K−1 is achieved at 423 K for the sample with x = 0.20. Practical applicability is verified using phosphor-embedded silicone elastomers, which enable accurate temperature sensing under various ambient light conditions (sunlight, cloudy day, and indoor lighting). This work confirms the great potential of visible-light-excited NIR-emitting materials in ambient-light-activated fluorescence thermometry.
{"title":"Fluorescence thermometry utilizing ambient light via energy transfer progression","authors":"Shuai He , Shuang Zheng , Yubo Lin , Liangliang Zhang , Xuanli Wang , Xiaobo Yu , Qian Guan , Luomeng Chao , Jun Qiao , Yonghong Ma","doi":"10.1016/j.jlumin.2025.121732","DOIUrl":"10.1016/j.jlumin.2025.121732","url":null,"abstract":"<div><div>Optical thermometry based on temperature-dependent luminescent parameters, such as the luminescent intensity ratio (LIR), offers non-contact operation and high resolution but often requires complex excitation systems. This study presents a broadband near-infrared (NIR)-emitting phosphor, Gd<sub>2.4</sub>Lu<sub>0.6</sub>Ga<sub>4</sub>AlO<sub>12</sub> (GLGA): Cr<sup>3+</sup>, xYb<sup>3+</sup>, which can be directly excited by ambient light, thereby significantly simplifying the measurement setup by eliminating the need for an external light source. The material exhibits an emission spectrum covering 650–1050 nm and demonstrates remarkable temperature-dependent characteristics over the 303–483 K range. By leveraging energy transfer between Cr<sup>3+</sup> and Yb<sup>3+</sup> and their distinct thermal quenching behaviors, the LIR of Yb<sup>3+</sup> to Cr<sup>3+</sup> emission is established as a reliable temperature probe. A maximum relative sensitivity of 0.5 % K<sup>−1</sup> is achieved at 423 K for the sample with x = 0.20. Practical applicability is verified using phosphor-embedded silicone elastomers, which enable accurate temperature sensing under various ambient light conditions (sunlight, cloudy day, and indoor lighting). This work confirms the great potential of visible-light-excited NIR-emitting materials in ambient-light-activated fluorescence thermometry.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121732"},"PeriodicalIF":3.6,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145877041","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 : 2025-12-31DOI: 10.1016/j.jlumin.2025.121733
Arindam Halder
We present a cladding-pumped (at 445 nm) Dysprosium (Dy)-doped germano-alumino-silicate fibre (DGAF) laser operating at 583 nm, producing 148 mW of output power with 3.24 % slope efficiency. The DGAFs with 125 μm cladding, 8–10 μm core, and ∼0.13 NA were fabricated in-house using modified chemical vapour deposition process with solution doping technique (MCVD-SD). The fabrication steps, Dy3+ absorption and emission spectra, emission lime times; laser cavity design, laser performances, and photodarkening effect (PD) for DGAFs were discussed. The impact of PD on the 583 nm laser output, laser threshold and efficiency were studied. The influence of different glass modifiers like as magnesium (Mg), yttrium (Y), cerium (Ce), on the PD behavior of the 583 nm laser in DGAFs was investigated. A significant change in background attenuation at 630 nm was observed between pristine and post-PD conditions, ranging from below 50 dB/km to above 100 dB/km. This change was attributed to PD which is believed to be the primary factor affecting the generation a good-quality yellow laser using Dy doped silica fibre. This research will be beneficial for the development of future yellow lasers using Dy-doped silica fibre.
{"title":"583 nm laser using Dy-doped silica fibre: Study of fibre fabrication, absorption and emission spectra, yellow laser, photodarkening and related spectral changes","authors":"Arindam Halder","doi":"10.1016/j.jlumin.2025.121733","DOIUrl":"10.1016/j.jlumin.2025.121733","url":null,"abstract":"<div><div>We present a cladding-pumped (at 445 nm) Dysprosium (Dy)-doped germano-alumino-silicate fibre (DGAF) laser operating at 583 nm, producing 148 mW of output power with 3.24 % slope efficiency. The DGAFs with 125 μm cladding, 8–10 μm core, and ∼0.13 NA were fabricated in-house using modified chemical vapour deposition process with solution doping technique (MCVD-SD). The fabrication steps, Dy<sup>3+</sup> absorption and emission spectra, emission lime times; laser cavity design, laser performances, and photodarkening effect (PD) for DGAFs were discussed. The impact of PD on the 583 nm laser output, laser threshold and efficiency were studied. The influence of different glass modifiers like as magnesium (Mg), yttrium (Y), cerium (Ce), on the PD behavior of the 583 nm laser in DGAFs was investigated. A significant change in background attenuation at 630 nm was observed between pristine and post-PD conditions, ranging from below 50 dB/km to above 100 dB/km. This change was attributed to PD which is believed to be the primary factor affecting the generation a good-quality yellow laser using Dy doped silica fibre. This research will be beneficial for the development of future yellow lasers using Dy-doped silica fibre.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121733"},"PeriodicalIF":3.6,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145877042","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 : 2025-12-30DOI: 10.1016/j.jlumin.2025.121727
Javier Fernández-Martínez , Nikolaos Kyvelos , Herko P. van der Meulen , Guillermo López-Polín , David Hernández-Pinilla , Pablo Ares , Christos Tserkezis , Mariola O. Ramírez , Luisa E. Bausá
Two-dimensional transition metal dichalcogenides host strongly bound excitonic quasiparticles whose optical response can be tailored by external perturbations. Strain gradients, in particular, provide a powerful route to control exciton-to-trion conversion with nanometric precision, opening opportunities for excitonic circuitry. Here, we probe nanometrically localized strain fields in monolayer MoS2 transferred onto a linear chain of Ag nanoparticles on LiNbO3 substrates. The nanoparticle chain induces one-dimensional nanoscale strain gradients in the monolayer while its plasmonic resonance remains spectrally detuned from the MoS2 excitonic transitions, ensuring that the observed response arises purely from strain-induced effects. Room temperature spatially resolved photoluminescence shows strain-driven modifications of the excitonic response, consistent with the predicted strain distribution. However, at cryogenic temperatures, the trion-to-exciton emission ratio increases significantly, by around an order of magnitude, near the Ag nanoparticle chain. This indicates a highly efficient, nanometrically localized exciton-to-trion conversion mainly driven by the enhanced strain gradients and the increased funneling efficiency at cryogenic temperatures, where the relative role of drift, and hence funneling efficiency, increases. The results provide direct experimental evidence of the effects of nanoscale, strain-driven trion manipulation at low temperature, achieved without the need for electric gates or advanced lithographic patterning, and underscores nanometer-wide wrinkles formed by the nanoparticle chain as a scalable and versatile strain-engineered platform for reconfigurable excitonic devices and quantum optoelectronics.
{"title":"Enhanced exciton-to-trion conversion in monolayer MoS2 via nanometrically localized strain at cryogenic temperature","authors":"Javier Fernández-Martínez , Nikolaos Kyvelos , Herko P. van der Meulen , Guillermo López-Polín , David Hernández-Pinilla , Pablo Ares , Christos Tserkezis , Mariola O. Ramírez , Luisa E. Bausá","doi":"10.1016/j.jlumin.2025.121727","DOIUrl":"10.1016/j.jlumin.2025.121727","url":null,"abstract":"<div><div>Two-dimensional transition metal dichalcogenides host strongly bound excitonic quasiparticles whose optical response can be tailored by external perturbations. Strain gradients, in particular, provide a powerful route to control exciton-to-trion conversion with nanometric precision, opening opportunities for excitonic circuitry. Here, we probe nanometrically localized strain fields in monolayer MoS<sub>2</sub> transferred onto a linear chain of Ag nanoparticles on LiNbO<sub>3</sub> substrates. The nanoparticle chain induces one-dimensional nanoscale strain gradients in the monolayer while its plasmonic resonance remains spectrally detuned from the MoS<sub>2</sub> excitonic transitions, ensuring that the observed response arises purely from strain-induced effects. Room temperature spatially resolved photoluminescence shows strain-driven modifications of the excitonic response, consistent with the predicted strain distribution. However, at cryogenic temperatures, the trion-to-exciton emission ratio increases significantly, by around an order of magnitude, near the Ag nanoparticle chain. This indicates a highly efficient, nanometrically localized exciton-to-trion conversion mainly driven by the enhanced strain gradients and the increased funneling efficiency at cryogenic temperatures, where the relative role of drift, and hence funneling efficiency, increases. The results provide direct experimental evidence of the effects of nanoscale, strain-driven trion manipulation at low temperature, achieved without the need for electric gates or advanced lithographic patterning, and underscores nanometer-wide wrinkles formed by the nanoparticle chain as a scalable and versatile strain-engineered platform for reconfigurable excitonic devices and quantum optoelectronics.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121727"},"PeriodicalIF":3.6,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035079","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}
The synthesis of carbon dots via a green route using natural precursor exhibits unique properties, making them a promising candidate for various applications. In this work, we utilized hill galgal juice for synthesizing carbon dots using a cost-effective one-step hydrothermal-assisted green method. We examined the crystal phase and optical properties of the synthesized sample using various techniques, including X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), Raman spectroscopy, UV–Vis spectroscopy, and photoluminescence spectroscopy. The resulting carbon dots exhibited an increased interlayer spacing of about 4.02 Å and a wide optical bandgap of ∼3.2 eV, which can be attributed to the oxygen-containing groups bonded to their surfaces. Interestingly, it was found that when subjected to ultraviolet light, the carbon dots exhibited strong, bright bluish-green fluorescence and exhibited high photoluminescence. Additionally, we fabricated an ultraviolet sensor at room temperature using the as-synthesized sample, achieving a sensing response of 9 % without employing any complex steps. Moreover, the quantum yield of synthesized carbon dots was found to be 22 %.
{"title":"Eco-friendly carbon dots synthesized from galgal juice for ultraviolet detection","authors":"Srijan Pushkarna , Jyoti Prakash , Kapil Sood , Praveen Malik , Mamta Shandilya , Shivani Dhall","doi":"10.1016/j.jlumin.2025.121730","DOIUrl":"10.1016/j.jlumin.2025.121730","url":null,"abstract":"<div><div>The synthesis of carbon dots via a green route using natural precursor exhibits unique properties, making them a promising candidate for various applications. In this work, we utilized hill galgal juice for synthesizing carbon dots using a cost-effective one-step hydrothermal-assisted green method. We examined the crystal phase and optical properties of the synthesized sample using various techniques, including X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), Raman spectroscopy, UV–Vis spectroscopy, and photoluminescence spectroscopy. The resulting carbon dots exhibited an increased interlayer spacing of about 4.02 Å and a wide optical bandgap of ∼3.2 eV, which can be attributed to the oxygen-containing groups bonded to their surfaces. Interestingly, it was found that when subjected to ultraviolet light, the carbon dots exhibited strong, bright bluish-green fluorescence and exhibited high photoluminescence. Additionally, we fabricated an ultraviolet sensor at room temperature using the as-synthesized sample, achieving a sensing response of 9 % without employing any complex steps. Moreover, the quantum yield of synthesized carbon dots was found to be 22 %.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121730"},"PeriodicalIF":3.6,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883739","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 : 2025-12-30DOI: 10.1016/j.jlumin.2025.121731
Chou-Yi Hsu , Ghaleb A. Oriquat , Rekha M M , Subhashree Ray , Jayshree Nellore , Vimal Arora , Ibrahim K. Alsulami , Zaid H. Mahmoud
Brain chemistry, also known as neurochemistry, refers to the study of the chemical substances and processes within the nervous system, particularly the brain, that influence its function and behavior. These chemicals, including neurotransmitters (NTs) and neuromodulators, play a vital role in communication between neurons and ultimately control everything from movement and thought to emotions and bodily functions. Understanding the specific functions of chemical messengers in brain communication requires highly precise tools capable of measuring the concentration and release patterns of neurotransmitters and neuromodulators. Optical (bio)sensors are emerging as powerful tools for monitoring brain chemistry with high spatial and temporal resolution, offering unprecedented insights into brain function and disease. Here we present a comprehensive review of nano optical biosensors that can be helpful for brain neurochemical monitoring through sensitive detection of NTs and neuromodulators.
{"title":"Optical-based sensors for monitoring of brain chemistry biomarkers","authors":"Chou-Yi Hsu , Ghaleb A. Oriquat , Rekha M M , Subhashree Ray , Jayshree Nellore , Vimal Arora , Ibrahim K. Alsulami , Zaid H. Mahmoud","doi":"10.1016/j.jlumin.2025.121731","DOIUrl":"10.1016/j.jlumin.2025.121731","url":null,"abstract":"<div><div>Brain chemistry, also known as neurochemistry, refers to the study of the chemical substances and processes within the nervous system, particularly the brain, that influence its function and behavior. These chemicals, including neurotransmitters (NTs) and neuromodulators, play a vital role in communication between neurons and ultimately control everything from movement and thought to emotions and bodily functions. Understanding the specific functions of chemical messengers in brain communication requires highly precise tools capable of measuring the concentration and release patterns of neurotransmitters and neuromodulators. Optical (bio)sensors are emerging as powerful tools for monitoring brain chemistry with high spatial and temporal resolution, offering unprecedented insights into brain function and disease. Here we present a comprehensive review of nano optical biosensors that can be helpful for brain neurochemical monitoring through sensitive detection of NTs and neuromodulators.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121731"},"PeriodicalIF":3.6,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883740","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 : 2025-12-28DOI: 10.1016/j.jlumin.2025.121729
Chunyue Yu, Hang Yin, Jie Guo, Ying Shi
Metal-free organic thermally activated delayed fluorescence (TADF) materials hold significant promise for optoelectronic applications. Remarkably, Fu et al. achieved simultaneous regulation of the photoluminescence quantum yields (PLQY) of the chromophores by fluorine substitution, with HPI2C-F and HPI2C-3F showing significantly higher PLQY than HPI2C, while HPI2C-2F shows a slight decrease in comparison to HPI2C [Adv. Opt. Mater. 12, 2303025 (2024)]. However, several unresolved questions regarding the mechanism of simultaneous PLQY regulation require further theoretical investigations. Specifically, what are the key factors that contribute to the significant differences in PLQY across the HPI2C derivatives? Which excited state is crucial in improving the efficiency of triplet exciton utilization? What is the interaction mechanism between excited-state intramolecular proton transfer (ESIPT) and TADF? Herein, the TADF mechanisms of HPI2C-F, HPI2C-2F, and HPI2C-3F molecules are systematically investigated using the optimally tuned range-separated density functional theory. We verify the key role of the T2 state in the TADF process that involves the Keto∗ state of the fluoro-substituted HPI2C derivatives. Moreover, we reveal that the energy inversion of singlet and triplet excited states (negative ΔEST) facilitates reverse intersystem crossing (RISC), resulting in significantly enhanced delayed fluorescence and ultimately improved PLQY for HPI2C-F and HPI2C-3F. Meanwhile, the STEOM-DLPNO-CCSD method and double-hybrid density functional theory were employed to confirm the reliability of the optimally tuned range-separated functionals in calculating the TADF mechanisms of the fluoro-substituted HPI2C derivatives. This investigation not only provides deep insights into the efficient TADF mechanisms, but also demonstrates the accuracy and effectiveness of optimally tuned range-separated functionals in predicting the luminescent properties of metal-free organic TADF materials.
{"title":"Optimally tuned range-separated functionals unravel efficient TADF mechanisms in HPI2C derivatives","authors":"Chunyue Yu, Hang Yin, Jie Guo, Ying Shi","doi":"10.1016/j.jlumin.2025.121729","DOIUrl":"10.1016/j.jlumin.2025.121729","url":null,"abstract":"<div><div>Metal-free organic thermally activated delayed fluorescence (TADF) materials hold significant promise for optoelectronic applications. Remarkably, Fu et al. achieved simultaneous regulation of the photoluminescence quantum yields (PLQY) of the chromophores by fluorine substitution, with HPI2C-F and HPI2C-3F showing significantly higher PLQY than HPI2C, while HPI2C-2F shows a slight decrease in comparison to HPI2C [Adv. Opt. Mater. 12, 2303025 (2024)]. However, several unresolved questions regarding the mechanism of simultaneous PLQY regulation require further theoretical investigations. Specifically, what are the key factors that contribute to the significant differences in PLQY across the HPI2C derivatives? Which excited state is crucial in improving the efficiency of triplet exciton utilization? What is the interaction mechanism between excited-state intramolecular proton transfer (ESIPT) and TADF? Herein, the TADF mechanisms of HPI2C-F, HPI2C-2F, and HPI2C-3F molecules are systematically investigated using the optimally tuned range-separated density functional theory. We verify the key role of the T<sub>2</sub> state in the TADF process that involves the Keto∗ state of the fluoro-substituted HPI2C derivatives. Moreover, we reveal that the energy inversion of singlet and triplet excited states (negative ΔE<sub>ST</sub>) facilitates reverse intersystem crossing (RISC), resulting in significantly enhanced delayed fluorescence and ultimately improved PLQY for HPI2C-F and HPI2C-3F. Meanwhile, the STEOM-DLPNO-CCSD method and double-hybrid density functional theory were employed to confirm the reliability of the optimally tuned range-separated functionals in calculating the TADF mechanisms of the fluoro-substituted HPI2C derivatives. This investigation not only provides deep insights into the efficient TADF mechanisms, but also demonstrates the accuracy and effectiveness of optimally tuned range-separated functionals in predicting the luminescent properties of metal-free organic TADF materials.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"291 ","pages":"Article 121729"},"PeriodicalIF":3.6,"publicationDate":"2025-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881423","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 : 2025-12-27DOI: 10.1016/j.jlumin.2025.121728
Jiaan Gao, Yifu Zhang, Xiaonan Wang, Siqi Wang, Hui Li
This study employs density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations to investigate the excited-state intramolecular proton transfer (ESIPT) behaviors of HBOB and its hydrazine derivative HBON in n-heptane, with a particular emphasis on their modulation by external electric fields (EEFs). Both molecules possess multiple hydrogen-bond donors and acceptors, enabling two distinct ESIPT pathways, categorized as imine-type (Channel 1) and hydrazone-type (Channel 2) derivatives. Boltzmann analysis shows that both the imine-type and hydrazone-type tautomers are accessible, enabling two parallel proton-transfer pathways upon photoexcitation. In the absence of EEFs, both molecular systems are capable of undergoing Dual-Channel ESIPT. Consequently, Channel 2 is kinetically favored in HBOB, while HBON shows a modest thermodynamic stabilization of the Channel 1 Keto∗ species. Moreover, Channel 2 exhibits a barrierless ESIPT for HBOB-7 and HBON-3, with HBOB-7 initiating proton transfer earlier. This intrinsic energetic asymmetry explains why EEFs selectively enhance different pathways in the two systems. Theoretical results confirm that, upon application of EEFs, a negative EEF facilitates proton transfer in the reactant molecules HBOB-1 and HBOB-7, while a positive EEF promotes proton transfer along Channel 1 and Channel 2 in the product molecules HBON-1 and HBON-3. These findings provide valuable insights into the EEF-regulated ESIPT mechanisms and underscore the potential of external electric fields as precise and versatile tools for tailoring excited-state behaviors in hydrogen-bonded systems.
{"title":"Tunable dual ESIPT pathways directed by external electric fields: A TDDFT exploration of HBOB/HBON systems","authors":"Jiaan Gao, Yifu Zhang, Xiaonan Wang, Siqi Wang, Hui Li","doi":"10.1016/j.jlumin.2025.121728","DOIUrl":"10.1016/j.jlumin.2025.121728","url":null,"abstract":"<div><div>This study employs density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations to investigate the excited-state intramolecular proton transfer (ESIPT) behaviors of HBOB and its hydrazine derivative HBON in n-heptane, with a particular emphasis on their modulation by external electric fields (EEFs). Both molecules possess multiple hydrogen-bond donors and acceptors, enabling two distinct ESIPT pathways, categorized as imine-type (Channel 1) and hydrazone-type (Channel 2) derivatives. Boltzmann analysis shows that both the imine-type and hydrazone-type tautomers are accessible, enabling two parallel proton-transfer pathways upon photoexcitation. In the absence of EEFs, both molecular systems are capable of undergoing Dual-Channel ESIPT. Consequently, Channel 2 is kinetically favored in HBOB, while HBON shows a modest thermodynamic stabilization of the Channel 1 Keto∗ species. Moreover, Channel 2 exhibits a barrierless ESIPT for HBOB-7 and HBON-3, with HBOB-7 initiating proton transfer earlier. This intrinsic energetic asymmetry explains why EEFs selectively enhance different pathways in the two systems. Theoretical results confirm that, upon application of EEFs, a negative EEF facilitates proton transfer in the reactant molecules HBOB-1 and HBOB-7, while a positive EEF promotes proton transfer along Channel 1 and Channel 2 in the product molecules HBON-1 and HBON-3. These findings provide valuable insights into the EEF-regulated ESIPT mechanisms and underscore the potential of external electric fields as precise and versatile tools for tailoring excited-state behaviors in hydrogen-bonded systems.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"291 ","pages":"Article 121728"},"PeriodicalIF":3.6,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881424","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}
The Tb: 24BaO-4Y2O3-72B2O3 (BYB) glasses containing 0.1–10 mol% Tb were successfully prepared by the melt-quenching technique. The photoluminescence (PL) and thermally stimulated luminescence (TSL) properties were systematically investigated. In the PL and TSL spectra, Tb: BYB glasses exhibited emission bands attributable to the 4f-4f transitions of Tb3+ ions. The lowest detectable dose, estimated from the TSL dose response function of the 5 mol% Tb: BYB glass, was 0.1 mGy. Furthermore, the 5 mol% Tb: BYB glass achieved a spatial resolution of 8.00 LP/mm under X-ray irradiation at a dose of 3 Gy.
{"title":"Photoluminescence and thermally stimulated luminescence properties of Tb-doped 24BaO-4Y2O3-72B2O3 glasses","authors":"Haruaki Ezawa, Keita Miyajima, Akihiro Nishikawa, Takumi Kato, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida","doi":"10.1016/j.jlumin.2025.121724","DOIUrl":"10.1016/j.jlumin.2025.121724","url":null,"abstract":"<div><div>The Tb: 24BaO-4Y<sub>2</sub>O<sub>3</sub>-72B<sub>2</sub>O<sub>3</sub> (BYB) glasses containing 0.1–10 mol% Tb were successfully prepared by the melt-quenching technique. The photoluminescence (PL) and thermally stimulated luminescence (TSL) properties were systematically investigated. In the PL and TSL spectra, Tb: BYB glasses exhibited emission bands attributable to the 4f-4f transitions of Tb<sup>3+</sup> ions. The lowest detectable dose, estimated from the TSL dose response function of the 5 mol% Tb: BYB glass, was 0.1 mGy. Furthermore, the 5 mol% Tb: BYB glass achieved a spatial resolution of 8.00 LP/mm under X-ray irradiation at a dose of 3 Gy.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"292 ","pages":"Article 121724"},"PeriodicalIF":3.6,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883738","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 : 2025-12-24DOI: 10.1016/j.jlumin.2025.121725
Linlin Li , Lingxuan Kong , Jingying Chen , Zhi Zhu , Xu Tang , Xuan Wei , Hongyue Wu
Optical temperature measurement is crucial in various fields, driving the development of fluorescent thermometer materials that are highly sensitive, environmentally friendly, and cost-effective. This paper investigates a temperature sensitive phosphor material based on CaWO4: Tb3+, which achieves ultra-low doping concentration temperature measurement by co-doping Li+ as a charge compensator. A series of CaWO4: Tb3+ phosphors were synthesized using the high-temperature solid-phase method, and their structures and luminescent properties were studied. XRD Rietveld refinement shows that the introduction of Li+ leads to a slight reduction in lattice volume, effectively alleviating the lattice distortion caused by Tb3+ doping. The photoluminescence spectra show that the introduction of Li+ significantly enhances the luminescence intensity of Tb3+, as Li+ reduces lattice defects and improves luminous efficiency. More importantly, by optimizing the doping concentration, CaWO4: 0.0005Tb3+, 0.0005Li+ phosphor was successfully prepared, and high-sensitivity temperature measurement was achieved. The phosphors exhibits excellent fluorescence intensity ratio and chromaticity variation in the temperature range of 293–473 K, with absolute and relative sensitivity reaching 0.21 K−1 at 473 K and 2.2 % K−1 at 473 K, respectively, making it an ideal material for ultra-low doping concentration optical temperature measurement.
{"title":"Charge compensation boosts luminous efficiency to achieve ultra-low doped optical thermometer CaWO4: Tb3+ phosphors","authors":"Linlin Li , Lingxuan Kong , Jingying Chen , Zhi Zhu , Xu Tang , Xuan Wei , Hongyue Wu","doi":"10.1016/j.jlumin.2025.121725","DOIUrl":"10.1016/j.jlumin.2025.121725","url":null,"abstract":"<div><div>Optical temperature measurement is crucial in various fields, driving the development of fluorescent thermometer materials that are highly sensitive, environmentally friendly, and cost-effective. This paper investigates a temperature sensitive phosphor material based on CaWO<sub>4</sub>: Tb<sup>3+</sup>, which achieves ultra-low doping concentration temperature measurement by co-doping Li<sup>+</sup> as a charge compensator. A series of CaWO<sub>4</sub>: Tb<sup>3+</sup> phosphors were synthesized using the high-temperature solid-phase method, and their structures and luminescent properties were studied. XRD Rietveld refinement shows that the introduction of Li<sup>+</sup> leads to a slight reduction in lattice volume, effectively alleviating the lattice distortion caused by Tb<sup>3+</sup> doping. The photoluminescence spectra show that the introduction of Li<sup>+</sup> significantly enhances the luminescence intensity of Tb<sup>3+</sup>, as Li<sup>+</sup> reduces lattice defects and improves luminous efficiency. More importantly, by optimizing the doping concentration, CaWO<sub>4</sub>: 0.0005Tb<sup>3+</sup>, 0.0005Li<sup>+</sup> phosphor was successfully prepared, and high-sensitivity temperature measurement was achieved. The phosphors exhibits excellent fluorescence intensity ratio and chromaticity variation in the temperature range of 293–473 K, with absolute and relative sensitivity reaching 0.21 K<sup>−1</sup> at 473 K and 2.2 % K<sup>−1</sup> at 473 K, respectively, making it an ideal material for ultra-low doping concentration optical temperature measurement.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"291 ","pages":"Article 121725"},"PeriodicalIF":3.6,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145838657","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}
In this paper, Cs2NaRECl6 (RE = Yb0.9Er0.1, Tb, Eu) microncrystals (MCs) were synthesized via a facile solvent-thermal method with the ethanol-water mixture (95.6∶4.4, m/m) as solvent. The prepared MCs were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). Photoluminescence (PL) properties of prepared MCs were measured and possible luminescent processes were given.
{"title":"Solvent-thermal synthesis and photoluminescence properties of rare-earth based double perovskite Cs2NaRECl6 (RE = Yb0.9Er0.1, Tb, Eu) microcrystals","authors":"Ruifei Qin, Lina Liu, Chunjuan Tang, Guanglei Guo, Kexin Wang, Jia Liu, Feng Shan","doi":"10.1016/j.jlumin.2025.121722","DOIUrl":"10.1016/j.jlumin.2025.121722","url":null,"abstract":"<div><div>In this paper, Cs<sub>2</sub>NaRECl<sub>6</sub> (RE = Yb<sub>0.9</sub>Er<sub>0.1</sub>, Tb, Eu) microncrystals (MCs) were synthesized via a facile solvent-thermal method with the ethanol-water mixture (95.6∶4.4, m/m) as solvent. The prepared MCs were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). Photoluminescence (PL) properties of prepared MCs were measured and possible luminescent processes were given.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"291 ","pages":"Article 121722"},"PeriodicalIF":3.6,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145838654","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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