Taking inspiration from multiple luminescence sources, Cr3+-doped Na-β"-Al2O3 fluorescent powder was synthesized through high-temperature solid-state method. The results show that Cr enters the Na-β"-Al2O3 lattice in the form of trivalent ions and occupies the Al3+ lattice within a limited concentration range. Phosphors are composed of submicrometer flake particles with good dispersion, and the concentration difference has little effect on the morphology and size of the particles. It is worth mentioning that by controlling the multisite occupation of Cr3+ in the matrix, spectral regulation can be realized in the near-infrared region, that is, the increase of Cr3+ concentration helps to broaden the emission peak at 709 nm (x = 0.13). Furthermore, the results of the energy transfer analysis show that there is energy transfer between Cr3+. More importantly, the band gap energy level provided by oxygen vacancies in the matrix leads to excellent thermal quenching resistance of the fluorescent powder between 378 and 428 K, and the luminescence intensity of the material can still maintain 60 % of that at room temperature when the temperature rises to 428 K. The phosphors with good microscopic morphology and thermal stability have application value in biological imaging, food safety detection, and other fields.
{"title":"Multisite occupation mechanism and near-infrared luminescence characteristics of Cr3+ ions in Na-β\"-Al2O3","authors":"Kenan Xu, Jing Wang, Zhongxiang Shi, Yanhua Sun, Xu Sun, Kexu Qian","doi":"10.1016/j.jlumin.2024.120986","DOIUrl":"10.1016/j.jlumin.2024.120986","url":null,"abstract":"<div><div>Taking inspiration from multiple luminescence sources, Cr<sup>3+</sup>-doped Na-β\"-Al<sub>2</sub>O<sub>3</sub> fluorescent powder was synthesized through high-temperature solid-state method. The results show that Cr enters the Na-β\"-Al<sub>2</sub>O<sub>3</sub> lattice in the form of trivalent ions and occupies the Al<sup>3+</sup> lattice within a limited concentration range. Phosphors are composed of submicrometer flake particles with good dispersion, and the concentration difference has little effect on the morphology and size of the particles. It is worth mentioning that by controlling the multisite occupation of Cr<sup>3+</sup> in the matrix, spectral regulation can be realized in the near-infrared region, that is, the increase of Cr<sup>3+</sup> concentration helps to broaden the emission peak at 709 nm (<em>x</em> = 0.13). Furthermore, the results of the energy transfer analysis show that there is energy transfer between Cr<sup>3+</sup>. More importantly, the band gap energy level provided by oxygen vacancies in the matrix leads to excellent thermal quenching resistance of the fluorescent powder between 378 and 428 K, and the luminescence intensity of the material can still maintain 60 % of that at room temperature when the temperature rises to 428 K. The phosphors with good microscopic morphology and thermal stability have application value in biological imaging, food safety detection, and other fields.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120986"},"PeriodicalIF":3.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660188","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 : 2024-11-09DOI: 10.1016/j.jlumin.2024.120981
Amos Vincent Ntarisa , Sudipta Saha , Nguyen Duy Quang , W. Cheewasukhanont , Faizan Anjum , N. Intachai , Y. Ruangtaweep , H.J. Kim , S. Kothan , J. Kaewkhao
The Ce3+ doped barium-zinc-gadolinium-phosphate glass samples with composition 20BaCO3-10ZnO-8Gd2O3-(62- )P2O5- CeBr3 (where , and 0.75 mol.%) were fabricated by employing melt-quenching traditional method. The PXRD studies were performed to verify the amorphous form of the fabricated glasses. FE-SEM was utilised to check the particle size and shape of prepared samples. The measurements of EDS were employed to find out the elements available in the glasses. Wideband emission was observed in the 300–400 nm range in the obtained spectra under X-ray and UV–VIS excitations, revealing a 5d-4f transition of Ce3+-ions. The detected excitation bands found broad for prepared glasses include 4f electronic energy level transitions belonging to Gd3+ and the 5d electronic energy levels belonging to the Ce3+ excitation energy band situated at 308 nm. The scintillation property was investigated with α-particles and -rays excitations using 241Am and 137Cs, 22Na radiation sources, respectively. The lifetime of the prepared glass samples was studied under 286 nm UV excitation and found 28.94 ± 0.12 ns as a short component and 166.47 ± 23.44 ns long component with 85 % and 15 % contributions, respectively for PBZG-0.25Ce glass sample.
{"title":"Investigation of radiation-induced luminescence properties of high-density barium phosphate glasses doped with Ce3+","authors":"Amos Vincent Ntarisa , Sudipta Saha , Nguyen Duy Quang , W. Cheewasukhanont , Faizan Anjum , N. Intachai , Y. Ruangtaweep , H.J. Kim , S. Kothan , J. Kaewkhao","doi":"10.1016/j.jlumin.2024.120981","DOIUrl":"10.1016/j.jlumin.2024.120981","url":null,"abstract":"<div><div>The Ce<sup>3+</sup> doped barium-zinc-gadolinium-phosphate glass samples with composition 20BaCO<sub>3</sub>-10ZnO-8Gd<sub>2</sub>O<sub>3</sub>-(62- <span><math><mrow><mi>x</mi></mrow></math></span>)P<sub>2</sub>O<sub>5</sub>-<span><math><mrow><mi>x</mi></mrow></math></span> CeBr<sub>3</sub> (where <span><math><mrow><mi>x</mi><mo>=</mo><mn>0.15</mn><mo>,</mo><mn>0.25</mn><mo>,</mo><mn>0.5</mn></mrow></math></span>, and 0.75 mol.%) were fabricated by employing melt-quenching traditional method. The PXRD studies were performed to verify the amorphous form of the fabricated glasses. FE-SEM was utilised to check the particle size and shape of prepared samples. The measurements of EDS were employed to find out the elements available in the glasses. Wideband emission was observed in the 300–400 nm range in the obtained spectra under X-ray and UV–VIS excitations, revealing a 5d-4f transition of Ce<sup>3+</sup>-ions. The detected excitation bands found broad for prepared glasses include 4f electronic energy level transitions belonging to Gd<sup>3+</sup> and the 5d electronic energy levels belonging to the Ce<sup>3+</sup> excitation energy band situated at 308 nm. The scintillation property was investigated with α-particles and <span><math><mrow><mi>γ</mi></mrow></math></span>-rays excitations using <sup>241</sup>Am and <sup>137</sup>Cs, <sup>22</sup>Na radiation sources, respectively. The lifetime of the prepared glass samples was studied under 286 nm UV excitation and found 28.94 ± 0.12 ns as a short component and 166.47 ± 23.44 ns long component with 85 % and 15 % contributions, respectively for PBZG-0.25Ce glass sample.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120981"},"PeriodicalIF":3.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660174","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 : 2024-11-09DOI: 10.1016/j.jlumin.2024.120980
Haowei Tan, Yoshiki Iso, Tetsuhiko Isobe
Small-molecule dyes with longer wavelength and higher photoluminescence quantum yield (PLQY) in water have attracted increasing attention due to their bright potential in fluorescence analysis technologies. Here, a red-emitting fluorescent dye of 1,2,4-triaminobenzene (TriAB) was modified with 3-aminopropyltriethoxysilane (APTES) to avoid contact with water molecules and to suppress fluorescence quenching due to O-H vibrations in water. The formation of a silica-like structure from hydrolytically polycondensed APTES was confirmed by X-ray diffractometry and Fourier-transform infrared absorption spectroscopy. Modification of TriAB with hydrolytically polycondensed APTES induced orange emission in the powder state, although TriAB powder did not exhibit any fluorescence before modification. The PLQY of APTES-modified TriAB in water was 11.1 %, which was higher than that of TriAB in water, 4.5 %. These results confirmed that the APTES derived silica-like matrix shielded TriAB from both water and intermolecular interactions with other TriAB molecules, overcoming fluorescence quenching.
{"title":"Photoluminescence enhancement of 1,2,4-triaminobenzene molecules by modification with hydrolytically polycondensed 3-aminopropyltriethoxysilane","authors":"Haowei Tan, Yoshiki Iso, Tetsuhiko Isobe","doi":"10.1016/j.jlumin.2024.120980","DOIUrl":"10.1016/j.jlumin.2024.120980","url":null,"abstract":"<div><div>Small-molecule dyes with longer wavelength and higher photoluminescence quantum yield (PLQY) in water have attracted increasing attention due to their bright potential in fluorescence analysis technologies. Here, a red-emitting fluorescent dye of 1,2,4-triaminobenzene (TriAB) was modified with 3-aminopropyltriethoxysilane (APTES) to avoid contact with water molecules and to suppress fluorescence quenching due to O-H vibrations in water. The formation of a silica-like structure from hydrolytically polycondensed APTES was confirmed by X-ray diffractometry and Fourier-transform infrared absorption spectroscopy. Modification of TriAB with hydrolytically polycondensed APTES induced orange emission in the powder state, although TriAB powder did not exhibit any fluorescence before modification. The PLQY of APTES-modified TriAB in water was 11.1 %, which was higher than that of TriAB in water, 4.5 %. These results confirmed that the APTES derived silica-like matrix shielded TriAB from both water and intermolecular interactions with other TriAB molecules, overcoming fluorescence quenching.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120980"},"PeriodicalIF":3.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-09DOI: 10.1016/j.jlumin.2024.120982
Akshay Kodiyawala, Arindam Mondal, Suban K. Sahoo, Subrata Dutta
To address the limitations of existing NIR-fluorescent probes that only detect either SO₂ or HSA individually, we have developed a NIR-fluorescent probe (AHN) capable of detecting both SO₂ and HSA independently and concurrently in PBS buffer (pH 7.4, 10 mM). AHN detects HSO₃⁻/SO₃2⁻ via nucleophilic addition to a carbon-carbon double bond and HSA via binding to a hydrophobic pocket of HSA. The probe emits distinct fluorescence signals to differentiate between SO₂ (λem = 488 nm) and HSA (λem = 720 nm). It also distinguishes between nucleophilic attacks by HSO₃⁻/SO₃2⁻ on free AHN probe (λem = 488 nm) and HSA-bound AHN (λem = 465 nm). The detection limits for SO₂ and HSA are 124 nM and 20.5 nM, respectively, and a detection limit of 22.4 nM for SO₂ in the presence of HSA. Drug competition studies reveal that AHN specifically targets the site-I of the HSA protein. The probe also successfully detects HSA in artificial urine and HSO₃⁻ in real samples, such as water, sugar, non-alcoholic wine, and biscuits. Furthermore, HSO3− can be detected by using simple cotton wool or filter paper.
{"title":"A dual channel NIR-fluorescence probe for simultaneous and independent sensing of SO2 and HSA","authors":"Akshay Kodiyawala, Arindam Mondal, Suban K. Sahoo, Subrata Dutta","doi":"10.1016/j.jlumin.2024.120982","DOIUrl":"10.1016/j.jlumin.2024.120982","url":null,"abstract":"<div><div>To address the limitations of existing NIR-fluorescent probes that only detect either SO₂ or HSA individually, we have developed a NIR-fluorescent probe (AHN) capable of detecting both SO₂ and HSA independently and concurrently in PBS buffer (pH 7.4, 10 mM). AHN detects HSO₃⁻/SO₃<sup>2</sup>⁻ via nucleophilic addition to a carbon-carbon double bond and HSA via binding to a hydrophobic pocket of HSA. The probe emits distinct fluorescence signals to differentiate between SO₂ (λ<sub>em</sub> = 488 nm) and HSA (λ<sub>em</sub> = 720 nm). It also distinguishes between nucleophilic attacks by HSO₃⁻/SO₃<sup>2</sup>⁻ on free AHN probe (λ<sub>em</sub> = 488 nm) and HSA-bound AHN (λ<sub>em</sub> = 465 nm). The detection limits for SO₂ and HSA are 124 nM and 20.5 nM, respectively, and a detection limit of 22.4 nM for SO₂ in the presence of HSA. Drug competition studies reveal that AHN specifically targets the site-I of the HSA protein. The probe also successfully detects HSA in artificial urine and HSO₃⁻ in real samples, such as water, sugar, non-alcoholic wine, and biscuits. Furthermore, HSO<sub>3</sub><sup>−</sup> can be detected by using simple cotton wool or filter paper.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120982"},"PeriodicalIF":3.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660190","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 : 2024-11-08DOI: 10.1016/j.jlumin.2024.120970
Yurii Kazarinov , Jens W. Tomm , Andrey Prokhorov , Roman Minikayev , Jaroslaw Z. Domagala , Jevgenijs Gabrusenoks , Anatoli I. Popov , Ilias Shcherbakov , S. Orel , Karina Lamonova
We have done the rigorous characterizing of the Mn-doped MgAl2O4 (Mn = 0, 0.02, 0.04, 0.1 wt%) single crystals and the comprehensive analysis of their optical properties theoretically supported by the Modified Crystal Field Theory to obtain the most complete picture, to date, of the diverse absorption and luminescence behavior of MgAl2O4:Mn spinels. The study has focused on exploring the formation and coexistence of multivalent states of Mn and identifying the conditions needed for activating luminescence channels. We found that Mn takes the charge state +2, +3 and + 4 and occupies both tetrahedral and octahedral positions. Six luminescence channels related to Mn ions were identified for the first time. Two channels activate the luminescence at 520 nm: intra-atomic transitions in tetrahedral coordinated Mn2+ ions under VIS-excitation and a recombination Mn3+→Mn2+→Mn3+ process involving Mn3+ in tetrahedral positions under X-ray. Mn3+ in tetrahedrons and octahedrons activate luminescence channels at 733 and 926 nm under UV-C and VIS excitations. Two distinct processes involving Mn3+ and Mn4+ ions in octahedrons result in the luminescence at 651 nm. The first is an intra-atomic transition in the Mn4+ occurring under VIS-excitation. The second appears through a charge transfer Mn3+→Mn4+→Mn3+ in the octahedrons under UV-B-excitation.
{"title":"Unusual manganese luminescence channels in low doped MgAl2O4","authors":"Yurii Kazarinov , Jens W. Tomm , Andrey Prokhorov , Roman Minikayev , Jaroslaw Z. Domagala , Jevgenijs Gabrusenoks , Anatoli I. Popov , Ilias Shcherbakov , S. Orel , Karina Lamonova","doi":"10.1016/j.jlumin.2024.120970","DOIUrl":"10.1016/j.jlumin.2024.120970","url":null,"abstract":"<div><div>We have done the rigorous characterizing of the Mn-doped MgAl<sub>2</sub>O<sub>4</sub> (Mn = 0, 0.02, 0.04, 0.1 wt%) single crystals and the comprehensive analysis of their optical properties theoretically supported by the Modified Crystal Field Theory to obtain the most complete picture, to date, of the diverse absorption and luminescence behavior of MgAl<sub>2</sub>O<sub>4</sub>:Mn spinels. The study has focused on exploring the formation and coexistence of multivalent states of Mn and identifying the conditions needed for activating luminescence channels. We found that Mn takes the charge state +2, +3 and + 4 and occupies both tetrahedral and octahedral positions. Six luminescence channels related to Mn ions were identified for the first time. Two channels activate the luminescence at 520 nm: intra-atomic transitions in tetrahedral coordinated Mn<sup>2+</sup> ions under VIS-excitation and a recombination Mn<sup>3+</sup>→Mn<sup>2+</sup>→Mn<sup>3+</sup> process involving Mn<sup>3+</sup> in tetrahedral positions under X-ray. Mn<sup>3+</sup> in tetrahedrons and octahedrons activate luminescence channels at 733 and 926 nm under UV-C and VIS excitations. Two distinct processes involving Mn<sup>3+</sup> and Mn<sup>4+</sup> ions in octahedrons result in the luminescence at 651 nm. The first is an intra-atomic transition in the Mn<sup>4+</sup> occurring under VIS-excitation. The second appears through a charge transfer Mn<sup>3+</sup>→Mn<sup>4+</sup>→Mn<sup>3+</sup> in the octahedrons under UV-B-excitation.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120970"},"PeriodicalIF":3.3,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660230","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 : 2024-11-07DOI: 10.1016/j.jlumin.2024.120976
Hui Zhang , Zhenyang Wang , Zhixing Chen , Xingyue Zhang , Yuanming Zhou , Fei Mei
The two-dimensional transition metal carbide MXenes, often designated by Ti3C2Tx, have garnered significant interest on account of their distinctive optoelectronic characteristics. In this paper, PEDOT:PSS/Ti3C2Tx composite hole transport layer (HTLs) was prepared by adding the MXenes material Ti3C2Tx into PEDOT:PSS, and quasi-two-dimensional perovskite light-emitting diodes (PeLEDs) were fabricated and investigated. While the addition concentration of Ti3C2Tx was 0.25 mg/mL, the optimal device shows the maximum luminance of 6250 cd/m2, and the current efficiency of 6.17 cd/A, which is 133 % and 112 % higher than the reference device without Ti3C2Tx, respectively. It is indicated that the additive incorporation of Ti3C2Tx in PEDOT:PSS can improve the efficiency of hole injection and conductivity of hole transport layer, and passivate the defects of perovskite film, thus enhancing the optoelectronic performance of PeLEDs. The findings of this study indicate that the PEDOT:PSS/Ti3C2Tx composite HTLs has considerable potential for application in PeLEDs.
{"title":"Impact of PEDOT:PSS/Ti3C2Tx composite hole transport layer on the performance of perovskite light emitting diodes","authors":"Hui Zhang , Zhenyang Wang , Zhixing Chen , Xingyue Zhang , Yuanming Zhou , Fei Mei","doi":"10.1016/j.jlumin.2024.120976","DOIUrl":"10.1016/j.jlumin.2024.120976","url":null,"abstract":"<div><div>The two-dimensional transition metal carbide MXenes, often designated by Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>, have garnered significant interest on account of their distinctive optoelectronic characteristics. In this paper, PEDOT:PSS/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> composite hole transport layer (HTLs) was prepared by adding the MXenes material Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> into PEDOT:PSS, and quasi-two-dimensional perovskite light-emitting diodes (PeLEDs) were fabricated and investigated. While the addition concentration of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> was 0.25 mg/mL, the optimal device shows the maximum luminance of 6250 cd/m<sup>2</sup>, and the current efficiency of 6.17 cd/A, which is 133 % and 112 % higher than the reference device without Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>, respectively. It is indicated that the additive incorporation of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> in PEDOT:PSS can improve the efficiency of hole injection and conductivity of hole transport layer, and passivate the defects of perovskite film, thus enhancing the optoelectronic performance of PeLEDs. The findings of this study indicate that the PEDOT:PSS/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> composite HTLs has considerable potential for application in PeLEDs.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120976"},"PeriodicalIF":3.3,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660189","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 : 2024-11-06DOI: 10.1016/j.jlumin.2024.120973
Haoyu Ma , Xiaoling Niu , Wenlong Qu , Yongliang Liu , Zhen Feng , Shengbo Zhu
Aggregation induced emission luminogens (AIEgens) as one of the optimal alternatives for designing stimuli-responsive fluorophores for real-life applications have sparked much current interest in smart materials design. Herein, the “Star molecules” in AIEgens of α-cyanostilbene and Tetraphenylethylene (TPE) derivatives were constructed into one molecular, namely DC-TPE-tBu and DC-TPE-CN. Both compounds exhibited significant AIE properties. Moreover, the two compounds could change their luminescent colors and intensities under the stimulation of external mechanical force and UV light, showing excellent mechanochromic luminescent (MCL) and remarkable photo-responsive behaviors, respectively. The stimuli responsive mechanisms were investigated by powder X-Ray diffractometer (PXRD) spectra and density functional theory calculations (DFT). The MLC behaviors were associated with the crystalline-to-amorphous transitions after mechanical grinding. These remarkable features make them suitable for the application of mechano/photo-sensors. The studies provide a useful strategy for developing AIE-active functional materials.
{"title":"AIE-active fluorescence emitters containing tetraphenylethylene and α-cyanostilbene with mechanochromism and photo-responsive behaviors","authors":"Haoyu Ma , Xiaoling Niu , Wenlong Qu , Yongliang Liu , Zhen Feng , Shengbo Zhu","doi":"10.1016/j.jlumin.2024.120973","DOIUrl":"10.1016/j.jlumin.2024.120973","url":null,"abstract":"<div><div>Aggregation induced emission luminogens (AIEgens) as one of the optimal alternatives for designing stimuli-responsive fluorophores for real-life applications have sparked much current interest in smart materials design. Herein, the “Star molecules” in AIEgens of α-cyanostilbene and Tetraphenylethylene (TPE) derivatives were constructed into one molecular, namely DC-TPE-tBu and DC-TPE-CN. Both compounds exhibited significant AIE properties. Moreover, the two compounds could change their luminescent colors and intensities under the stimulation of external mechanical force and UV light, showing excellent mechanochromic luminescent (MCL) and remarkable photo-responsive behaviors, respectively. The stimuli responsive mechanisms were investigated by powder X-Ray diffractometer (PXRD) spectra and density functional theory calculations (DFT). The MLC behaviors were associated with the crystalline-to-amorphous transitions after mechanical grinding. These remarkable features make them suitable for the application of mechano/photo-sensors. The studies provide a useful strategy for developing AIE-active functional materials.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120973"},"PeriodicalIF":3.3,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660185","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, the novel BaY2(MoO4)4:xSm3+ phosphors with strong red emission and high thermal stabilization were prepared by a conventional method of high temperature solid state reaction in air atmosphere. Morphology, phase purity, element distribution, UV–Vis–NIR diffuse reflectance spectroscopy (DRS), and luminescence properties were investigated in detail. The crystal structure of the BaY2(MoO4)4 host was refined with the aid of the Rietveld refinement method by the GSAS program. The electronic band structure and phonon dispersion were performed using plane-wave density functional theory (DFT). The prepared BaY2(MoO4)4:Sm3+ phosphor exhibits excellent red emission under near-ultraviolet excitation. Strong red emission intensity and high thermal stability suggest potential application in backlighting or phosphor-covered white light-emitting diodes (pc-LEDs).
{"title":"Theoretical and experimental investigation of BaY2(MoO4)4:xSm3+ phosphors","authors":"Weiguang Ran, Zicheng Zhang, Fukai Wang, Huixin Jiang, Yue Shao, Xiaoli Ma, Jiayi Geng, Tingjiang Yan","doi":"10.1016/j.jlumin.2024.120968","DOIUrl":"10.1016/j.jlumin.2024.120968","url":null,"abstract":"<div><div>In this paper, the novel BaY<sub>2</sub>(MoO<sub>4</sub>)<sub>4</sub>:xSm<sup>3+</sup> phosphors with strong red emission and high thermal stabilization were prepared by a conventional method of high temperature solid state reaction in air atmosphere. Morphology, phase purity, element distribution, UV–Vis–NIR diffuse reflectance spectroscopy (DRS), and luminescence properties were investigated in detail. The crystal structure of the BaY<sub>2</sub>(MoO<sub>4</sub>)<sub>4</sub> host was refined with the aid of the Rietveld refinement method by the GSAS program. The electronic band structure and phonon dispersion were performed using plane-wave density functional theory (DFT). The prepared BaY<sub>2</sub>(MoO<sub>4</sub>)<sub>4</sub>:Sm<sup>3+</sup> phosphor exhibits excellent red emission under near-ultraviolet excitation. Strong red emission intensity and high thermal stability suggest potential application in backlighting or phosphor-covered white light-emitting diodes (pc-LEDs).</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120968"},"PeriodicalIF":3.3,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660231","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 : 2024-11-05DOI: 10.1016/j.jlumin.2024.120978
Bungala Chinna Jamalaiah
The structural and luminescence properties of Tm3+ doped CaF2 based oxyfluoroborosilicate glasses and glass ceramics were discussed. The critical glass ceramic (BSTm1.0GC2) nature was obtained through different heat treatment processes as 450 °C for 1 h and the concentration of Tm3+ ions was optimized as 1.0 mol% for efficient emission. The spectroscopic and laser characteristic parameters were evaluated applying the standard Judd-Ofelt theory. The emission of blue light through 1D2 → 3F4 transition was studied by exciting at 360 nm UV wavelength. Upon 808 nm laser excitation, the glasses and glass ceramics produce 1.46 μm emission through 3H4 → 3F4 transition. The effective bandwidth (114.99 nm), stimulated emission cross-section (14.30 × 10−21 cm2), gain bandwidth (1644.74 × 10−28 cm3), figure of merit (10.21 × 10−24 cm2s) and the quantum yield (76 %) of 3H4 → 3F4 transition made the BSTm1.0GC2 suitable as gain medium for 1.46 μm NIR fiber laser applications.
{"title":"Tm3+ doped CaF2 based oxyfluroborosilicate glasses and glass ceramics for visible and NIR lasers","authors":"Bungala Chinna Jamalaiah","doi":"10.1016/j.jlumin.2024.120978","DOIUrl":"10.1016/j.jlumin.2024.120978","url":null,"abstract":"<div><div>The structural and luminescence properties of Tm<sup>3+</sup> doped CaF<sub>2</sub> based oxyfluoroborosilicate glasses and glass ceramics were discussed. The critical glass ceramic (BSTm1.0GC2) nature was obtained through different heat treatment processes as 450 °C for 1 h and the concentration of Tm<sup>3+</sup> ions was optimized as 1.0 mol% for efficient emission. The spectroscopic and laser characteristic parameters were evaluated applying the standard Judd-Ofelt theory. The emission of blue light through <sup>1</sup>D<sub>2</sub> → <sup>3</sup>F<sub>4</sub> transition was studied by exciting at 360 nm UV wavelength. Upon 808 nm laser excitation, the glasses and glass ceramics produce 1.46 μm emission through <sup>3</sup>H<sub>4</sub> → <sup>3</sup>F<sub>4</sub> transition. The effective bandwidth (114.99 nm), stimulated emission cross-section (14.30 × 10<sup>−21</sup> cm<sup>2</sup>), gain bandwidth (1644.74 × 10<sup>−28</sup> cm<sup>3</sup>), figure of merit (10.21 × 10<sup>−24</sup> cm<sup>2</sup>s) and the quantum yield (76 %) of <sup>3</sup>H<sub>4</sub> → <sup>3</sup>F<sub>4</sub> transition made the BSTm1.0GC2 suitable as gain medium for 1.46 μm NIR fiber laser applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120978"},"PeriodicalIF":3.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660184","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 : 2024-11-05DOI: 10.1016/j.jlumin.2024.120979
Ho Kim Dan , L.T. Ha , Nguyen Dinh Trung , Nguyen Minh Tam , Vu Thi Kim Lien , Nguyen Le Thai , Dacheng Zhou , Jianbei Qiu
In this paper, we investigate and report the effects of alkali ions A+ (A+ = Li+, Na+, K+) on the optical properties, bandwidth flatness (BFN), gain coefficient (G(λ)) for the near-infrared (NIR) emission spectra of Er3+-doped SiO2–ZnO–La2O3 (SZL) zinc silicate glass. With the change in the composition of A+ ions in the order from not containing any A+ ions → Li+ → Na+ → K+ → containing all three A+ ions including Li+, Na+, and K+, the direct and indirect bandgap (DBG and IBG), the absorption cross-section (σabs(λ)), the emission cross-section (σems(λ)), and the G(λ) parameters of Er3+-doped SZL glasses were determined to increase gradually. NIR emission intensities of Er3+-doped at 4I13/2 → 4I15/2 transition under excitations of both 808 and 980 nm LD all were significantly increased with the composition of A+ ions varies in order from not containing A+ ions → Li+ → Na+ → K+ → containing all three A+ ions. The reasons for the influence of A+ ions on the UC and NIR emission intensities of Er3+-doped in SZL glass are investigated and discussed. In addition, upconversion (UC) emission spectra of Er3+-doped, CIE 1931(x; y) coordinates and color region for UC emission spectra of Er3+-doped SZL glasses with different compositions of A+ ions under excitation of 980 nm laser diode (LD) are also determined.
{"title":"Effects of alkali ions on the optical properties, bandwidth flatness, and gain coefficient of near-infrared emission spectra of Er3+-doped zinc silicate glass","authors":"Ho Kim Dan , L.T. Ha , Nguyen Dinh Trung , Nguyen Minh Tam , Vu Thi Kim Lien , Nguyen Le Thai , Dacheng Zhou , Jianbei Qiu","doi":"10.1016/j.jlumin.2024.120979","DOIUrl":"10.1016/j.jlumin.2024.120979","url":null,"abstract":"<div><div>In this paper, we investigate and report the effects of alkali ions A<sup>+</sup> (A<sup>+</sup> = Li<sup>+</sup>, Na<sup>+</sup>, K<sup>+</sup>) on the optical properties, bandwidth flatness (BFN), gain coefficient (G(<em>λ</em>)) for the near-infrared (NIR) emission spectra of Er<sup>3+</sup>-doped SiO<sub>2</sub>–ZnO–La<sub>2</sub>O<sub>3</sub> (SZL) zinc silicate glass. With the change in the composition of A<sup>+</sup> ions in the order from not containing any A<sup>+</sup> ions → Li<sup>+</sup> → Na<sup>+</sup> → K<sup>+</sup> → containing all three A<sup>+</sup> ions including Li<sup>+</sup>, Na<sup>+</sup>, and K<sup>+</sup>, the direct and indirect bandgap (DBG and IBG), the absorption cross-section (σ<sub>abs</sub>(<em>λ</em>)), the emission cross-section (σ<sub>ems</sub>(<em>λ</em>)), and the G(<em>λ</em>) parameters of Er<sup>3+</sup>-doped SZL glasses were determined to increase gradually. NIR emission intensities of Er<sup>3+</sup>-doped at <sup>4</sup>I<sub>13/2</sub> → <sup>4</sup>I<sub>15/2</sub> transition under excitations of both 808 and 980 nm LD all were significantly increased with the composition of A<sup>+</sup> ions varies in order from not containing A<sup>+</sup> ions → Li<sup>+</sup> → Na<sup>+</sup> → K<sup>+</sup> → containing all three A<sup>+</sup> ions. The reasons for the influence of A<sup>+</sup> ions on the UC and NIR emission intensities of Er<sup>3+</sup>-doped in SZL glass are investigated and discussed. In addition, upconversion (UC) emission spectra of Er<sup>3+</sup>-doped, CIE 1931(x; y) coordinates and color region for UC emission spectra of Er<sup>3+</sup>-doped SZL glasses with different compositions of A<sup>+</sup> ions under excitation of 980 nm laser diode (LD) are also determined.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"277 ","pages":"Article 120979"},"PeriodicalIF":3.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660186","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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