JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Chenwei Xu,Chenxia Li,Degang Deng,Hua Yu,Le Wang,Changyu Shen,Xufeng Jing,Shiqing Xu
A series of new double perovskite structure CaLaMgTaO 6 : Bi 3+ , Eu 3+ phosphors were synthesized by high-temperature solid-phase method. The crystal structure, luminescence characteristics and temperature sensing performance have been systematically studied. The substitution rule of Bi 3+ in CLMT and its luminescence characteristics are described. The decay curve of Bi 3+ further proves the existence of an energy transfer from Bi 3+ to Eu 3+ . They have different thermal quenching behaviors, and their fluorescence intensity ratio (FIR) parameter has tremendous temperature sensing performance. Under 329 nm ultraviolet excitation, the emission peaks at 408 nm and 614 nm are used as the reference signal, the largest absolute sensitivity is 0.0127 K −1 at 573 K, and the maximum relative sensitivity is 1.33%K −1 at 483 K. This indicates that CaLaMgTaO 6 : Bi 3+ , Eu 3+ is a material with excellent temperature measurement performance and applicability in non-contact optical thermometers.
研究领域:
材料科学
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发光材料
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光学传感
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无机化学
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功能材料
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2016
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IF 2.183
Renping Cao,Xiangfeng Ceng,Jijun Huang,Hui Ao,Guotai Zheng,Xiaoguang Yu,Xinqin Zhang
A double perovskite Sr 2 ZnMoO 6 :Mn 4+ (SZM:Mn 4+ ) phosphor is synthesized by high-temperature solid-state reaction method in air. Emission band peaking at ∼705 nm of SZM:Mn 4+ phosphor in the range of 650–790 nm is attributed to the 2 E → 4 A 2 transition of Mn 4+ ion with activated different lattice vibration modes. Three excitation bands in the range of 210–610 nm are assigned to the O 2− → Mn 4+ charge transfer and the 4 A 2 → ( 4 T 1 , 2 T 2 , and 4 T 2 ) transition of Mn 4+ ion. The optimal Mn 4+ ion concentration is ∼0.8 mol% in SZM:Mn 4+ phosphor. Fluorescence lifetime of SZM:Mn 4+ phosphor decreases from ∼132 μs to 108 μs with increasing Mn 4+ ion concentration in the range of 0.2–1.0 mol%. Time-resolved spectra and fluorescence lifetime data indicate that luminescent center is caused by Mn 4+ ion. The luminous mechanism of SZM:Mn 4+ phosphor is explained by Tanabe-Sugano energy level diagram of Mn 4+ ion. The results are useful to understand the influences of the neighboring coordination environment around Mn 4+ and host crystal structure to the luminescence properties of Mn 4+ ion and develop other novel Mn 4+ -doped materials.
研究领域:
材料科学
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无机化学
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固体物理
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发光材料
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光电功能材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 51
·期 12
·16749-16757
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IF 5.1
Yihan Liu,Yingjie Mao,Zhichao Zhang,Kai Liu,Denghui Xu,Jun Zhou
Lead-free double perovskites (DPs), characterized by their low toxicity, broad emission spectra and excellent stability, have emerged as highly promising doped hosts with significant potential for visible light applications. However, achieving rich and distinctive multiple photoluminescent (PL) emission through doping with various lanthanide (Ln 3+ ) ions remains a formidable challenge. In this work, we explored the luminescent properties of Cs 2 KInCl 6 , which exhibits intrinsic broad self-trapped excitons (STEs) emission centered at 500 nm. By doping Ln 3+ ions (Dy 3+ , Sm 3+ , and Tb 3+ ) into Cs 2 KInCl 6 , multiple emission could be realized, along with energy transfer (ET) from the intrinsic STEs to Tb 3+ and Sm 3+ ions. Notably, the incorporation of Tb 3+ ions enhanced exciton-phonon coupling and lattice vibrations , resulting in strengthened STEs emission. Furthermore, tunable emission from green to yellow was achieved through multiple ET processes in Cs 2 KInCl 6 :Tb 3+ ,Sm 3+ by co-doping Tb 3+ and Sm 3+ . This work not only offers new insights into enhancing STEs emission in DPs, but also imparts Cs 2 KInCl 6 with tunable PL properties, which makes it a promising candidate for multicolor light-emitting devices.
研究领域:
材料科学
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光物理学
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无机化学
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发光材料
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半导体材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 50
·期 6
·9753-9761
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IF 5.2
Li Li,Haoliang Yang,Yongjie Wang,Faling Ling,Xianju Zhou,Guotao Xiang,Zhongmin Cao,Sha Jiang,Zhiyu Yang,Yongbin Hua
Novel Ca 2 ScNbO 6 (CSNO): Cr 3+ phosphors were synthesized through a solid-phase method. The crystal structures, luminescence performances, and applications were introduced in this work. The optimized doping concentration was found with a Cr 3+ concentration of 0.01 mol. Under the 336 nm excitation, the recorded photoluminescence spectrum in the range of 650–1300 nm indicated that the obtained sample can emit a broad near-infrared emission with a dominant peak of 858 nm while the full width at half maximum (FWHM) was determined to be 191 nm. To gain a deeper comprehension of the luminescent properties, the crystal field strength was investigated as Dq/B = 2.03, and the electron-phonon coupling for parameter S was calculated to be about 2.01. As for the potential application, utilizing the variable temperature decay lifetime technique, the relative sensitivity (S R ) was approximately 1.16% K −1 at 387 K, which can be promised for utilization in optical temperature measurement. On the other hand, a near-infrared phosphor-converted lighting-emitting diode ( Pc -LED) was fabricated for night vision. Eventually, the security ink based on the obtained sample was made for use in the anti-counterfeiting field.
研究领域:
材料科学
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光学工程
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无机化学
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功能材料
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生物医学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 28
·14162-14170
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IF 11.301
Zhihong Du,Keyun Li,Hailei Zhao,Xu Dong,Yang Zhang,Konrad Świerczek
Modified by Sm0.2Ce0.8O2−δ (SDC) nanoparticles (NPs), SmBaCo2O5+δ (SBCO) double perovskite oxide is evaluated as a promising cathode material for intermediate temperature solid oxide fuel cells. The SDC NPs are epitaxially grown on the surface of SBCO with (220) planes of SDC aligning smoothly to (020) or (100) planes of SBCO, forming a tight, coherent connection at the interface. The influence of this modification on thermal expansion, oxygen diffusion, electrical conductivity and electrochemical properties is investigated thoroughly in this work. The designed SBCO–SDC cathode material demonstrates a lower thermal expansion coefficient (TEC), ∼16.4 × 10−6 K−1, than that of the unmodified SBCO, ∼20.9 × 10−6 K−1. While SDC coating results in a decreased total electrical conductivity, it facilitates oxygen bulk diffusion and improves the surface exchange reaction kinetics. Coating with SDC NPs can accelerate the rate-determining process of dissociation of the absorbed molecular oxygen, especially at intermediate temperatures. Accordingly, the constructed symmetrical cell with the La0.8Sr0.2Ga0.8Mg0.2O3−δ (LSGM) electrolyte shows lower polarization resistance values, if the SBCO–SDC cathode is utilized. Also, the LSGM electrolyte-supported (300 μm) full cell is found to deliver a high power density of 800 mW cm−2 at 800 °C. Owing to the strong and coherent interfacial connection, the developed cathode demonstrates a relatively steady electrochemical performance.
研究领域:
材料科学
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能源化学
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电化学
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无机功能材料
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燃料电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）