JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Jie Yang,Jiujun Zhu,Laihui Luo,Wei Xie,Weiping Li,Peng Du
To settle the thermal quenching and dissatisfied sensitivity of luminescent materials, a series of Tm 3+ /Yb 3+ /Sc 3+ -tridoped Lu 2 W 3 O 12 upconverting microparticles was synthesized through sol-gel method. In-situ X-ray diffraction results reveal that the resultant samples have good negative thermal expansion (NTE) properties, which can be improved by Sc 3+ doping. Upon 980 nm excitation, the final products can emit brightness upconverison (UC) emissions and their intensities can be enhanced by Yb 3+ and Sc 3+ doping. Moreover, the temperature-dependent UC emission spectra suggest that the designed compounds possess anti-thermal quenching luminescence. Specially, these UC emissions from 1 G 4 , 3 F 2,3 and 3 H 4 levels show different responses to temperature, allowing their feasibilities in optical thermometry. Via utilizing the fluorescence intensity ratio technique to analyze the temperature-associated UC emissions from non-thermally coupled levels (non-TCLs), one knows that maximum absolute and relative sensitivities of developed upconverting microparticles are 0.124 K –1 and 3.105%/K, respectively, while those of the resultant upconverting microparticles are 4.895×10 –5 K –1 and 1.774%/K, respectively, when the TCLs are used. Our findings verify that the utilization of NTE effect is an efficient route to induce the anti-thermal quenching UC luminescence, and the thermometric properties of luminescent materials can also be regulated by selecting proper sensing strategy, spatial mode and doping content.
研究领域:
材料科学
·
光学物理
·
固态物理
·
测温技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Junwei Zhang,Hui Lin,Shuo Zhu,Yuetong Zhen,Ruijin Hong,Zhaoxia Han,Dawei Zhang
The rapid advancement of high-power solid-state lighting highlights the importance of developing phosphor ceramics with high resistance to thermal quenching of its luminescence. Herein, a series of Eu 2+ co-doping MgAl 2 O 4 : Mn 2+ phosphor ceramics were synthesized by spark plasma sintering. The significant green light enhancement at 516 nm is attributed to Eu 2+ -Mn 2+ energy transfer. The introduction of Eu 2+ increases the concentration of electron trap levels and improve the luminescence intensity at 423 K from 80% to 110%, compared with the counterparts at room temperature. The strong correlation between trap levels and oxygen vacancies was demonstrated by the X-ray photoelectron spectroscopy and electron paramagnetic resonance analysis. Finally, the application demonstration of the optimized sample was explored through its integration with a 400 nm LED chip. This study proposes a strategy of leveraging trap levels to induce anti-thermal quenching behavior, providing some insights for the development of highly thermally stable phosphor ceramics.
研究领域:
材料科学
·
发光材料
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固态照明
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陶瓷学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 42
·15201-15211
·
IF 7.393
Wanggui Ye,Chaoyang Ma,Yanbin Li,Chong Zhao,Yuzhen Wang,Chuandong Zuo,Zicheng Wen,Yingkui Li,Xuanyi Yuan,Yongge Cao
The thermal quenching of phosphors seems to be inevitable, which severely limits their applications related to high temperature. Therefore, the development of thermally stable phosphors and the exploration of anti-thermal quenching mechanism is still a pivotal need. Herein, an internal self-regulation anti-thermal quenching strategy has been proposed to develop Pr3+-activated GdNbO4 red phosphor, whose loss of red emission intensity can be compensated at the expense of blue emission during the heating process. The integrated photoluminescence intensity of GdNbO4:x%Pr3+ (x = 0.1–2.5) is maintained or even continuously enhanced from 300 K to 620 K based on the metal-to-metal charge transfer between Pr3+ ions and Nb5+ ions. For the GdNbO4:0.1%Pr3+ sample, the integrated intensity of its red emission remarkably reaches 290% at 540 K compared to that at 300 K. As expected, the opposite temperature response of Pr3+ 3P0 → 3H4 and 1D2 → 3H4 indicates that GdNbO4:0.1%Pr3+ has advantage in optical thermometry based on MMCT (Sr = 0.7% K−1 at 430 K and Sa = 18% K−1 at 620 K). Our work could open a new gateway to design phosphors with anti-thermal quenching performance for high-temperature applications and develop high-performance optical temperature sensing in Pr3+-activated oxide phosphors.
研究领域:
材料科学
·
光学
·
温度传感
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Chen Tianhong,Yan Dongpeng
Long persistent luminescence (LPL) has gained considerable attention for the applications in decoration, emergency signage, information encryption and biomedicine. However, recently developed LPL materials – encompassing inorganics, organics and inorganic-organic hybrids – often display monochromatic afterglow with limited functionality. Furthermore, triplet exciton-based phosphors are prone to thermal quenching, significantly restricting their high emission efficiency. Here, we show a straightforward wet-chemistry approach for fabricating multimode LPL materials by introducing both anion (Br − ) and cation (Sn 2+ ) doping into hexagonal CsCdCl 3 all-inorganic perovskites. This process involves establishing new trapping centers from [CdCl 6-n Br n ] 4− and/or [Sn 2-n Cd n Cl 9 ] 5− linker units, disrupting the local symmetry in the host framework. These halide perovskites demonstrate afterglow duration time ( > 2,000 s), nearly full-color coverage, high photoluminescence quantum yield ( ~ 84.47%), and the anti-thermal quenching temperature up to 377 K. Particularly, CsCdCl 3 : x %Br display temperature-dependent LPL and time-valve controllable time-dependent luminescence, while CsCdCl 3 : x %Sn exhibit forward and reverse excitation-dependent Janus-type luminescence. Combining both experimental and computational studies, this finding not only introduces a local-symmetry breaking strategy for simultaneously enhancing afterglow lifetime and efficiency, but also provides new insights into the multimode LPL materials with dynamic tunability for applications in luminescence, photonics, high-security anti-counterfeiting and information storage.
研究领域:
材料科学
·
光电技术
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光子学
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纳米技术
✓ 已验证
DOI
高影响因子
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