Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 42
·10154-10160
·
IF 5.066
J. L. Wang,E. H. Song,M. Wu,W. B. Dai,X. F. Jiang,B. Zhou,Q. Y. Zhang
Room-temperature green to orange color-tunable upconversion (UC) luminescence has been achieved from Yb3+/Mn2+ co-doped CaO by adjusting the doping concentration of Mn2+ ions and the temperature of the samples upon 980 nm laser diode excitation. In this material system, the green UC emission band centered at 508 nm and the wavelength-tunable orange UC emission band from 560 to 725 nm are realized at 980 nm excitation, which originate from the cooperative luminescence of Yb3+ pairs and the |2F7/2, 4T1(4G)〉 → |2F7/2, 6A1(S)〉 transition of exchange-coupled Yb3+–Mn2+ dimers, respectively. The characteristic Stokes and UC emission properties, UC luminescence decay behaviors, temperature-dependent UC emission properties, as well as the involved UC mechanism of CaO:Yb3+,Mn2+ are investigated and discussed in detail. This study offers a new method to design novel UC materials for lighting and display applications instead of using conventionally investigated lanthanide (Ln3+) ions, such as Er3+, Tm3+ and Ho3+.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 10
·2837-2849
·
IF 5.934
Peipei Dang,Dongjie Liu,Guogang Li,Sisi Liang,Hongzhou Lian,Mengmeng Shang,Jun Lin
Recently, controllable photoluminescence tuning by devising a solid solution framework, adjusting the valence mixing of Eu2+/Eu3+ and designing efficient energy transfer between activator ions has been extensively investigated and reported due to its significant advantages in the improvement and regulation of the luminescence performances of white light-emitting diodes (W-LEDs). In this study, we designed a series of novel Eu2+-doped (1 − x)Ca3(PO4)2–xCa9Y(PO4)7 (x = 0–1.0) isostructural solid solution phosphors with a β-Ca3(PO4)2-type structure, and powder samples were prepared via the traditional high-temperature solid-state reaction process. The crystal field variation around the Eu2+ ions causes superposition of linear luminescence and induces optical property tuning with a change in the solid solution ratio, x, values. Besides the high-energy emission peak at 418 nm in Ca3(PO4)2:0.03Eu2+, another low-energy emission peak at 486 nm was observed with the formation of the solid solution. Moreover, the corresponding high-energy emission peaks shifted from 418 to 430 nm, and the luminescence intensity of the low-energy emission at 486 nm increased with an increase in x, which was attributed to the combined effect of crystal field splitting of the local lattice and superposition of linear luminescence. In addition, tunable emission across the whole white light region could be realized by constructing a solid solution and adjusting the overall Eu concentration in (1 − x)Ca3(PO4)2–xCa9Y(PO4)7:Eu (x = 0.5, 0.7, 0.9, and 1.0), and the corresponding luminescence mechanisms have been proposed and discussed in detail. In the pursuit of precise color tuning, we also tested the Eu2+ → Mn2+ energy transfer in different compositions (x = 0.2, 0.5, 0.7, and 0.9) of the solid solution phosphors, and successive emission tuning from the blue and cyan range and then the red range was successfully achieved. Finally, the temperature-dependent photoluminescence and decay time were revealed systematically, and the corresponding mechanisms for the thermal quenching behavior have been discussed. This study provides a new perspective for color tuning originating from the simultaneous isostructural solid solution, valence mixing of Eu2+/Eu3+ and efficient energy transfer.
研究领域:
材料科学
·
光学材料
·
无机化学
·
固体物理
·
发光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 15
·5058-5063
·
IF 7.059
Jun Zhou,Mingze Li,Maxim S. Molokeev,Jiayue Sun,Denghui Xu,Zhiguo Xia
Dopants in luminescent metal halides provide an alternative way for photoluminescence tuning towards versatile optical applications. Here we report a trivalent antimony (Sb3+)-doped single crystalline 0D metal halide with the composition of (C9NH20)9[Pb3Cl11](ZnCl4)2:Sb3+. This compound possessed the coexistence of two emission centers including intrinsic and extrinsic self-trapped excitons (STEs), which are ascribed to [Pb3Cl11]5− clusters and triplet STEs formed by the 3P1–1S0 transition of Sb3+. By regulating the Sb3+ concentration, the emission can be tuned from green to yellow and finally to orange, which would help to develop optically pumped white light-emitting diodes (WLEDs) with different photometric characteristics. Moreover, this dopant-induced extrinsic STE approach presents a new direction towards tuning the luminescence properties of 0D metal halides, and may find application in environmentally-friendly, high-performance metal halide light emitters.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Zhen-Dong Lian,Bo Wang,Zhi-Sheng Wu,Hao Lin,Ting Ding,Jin-Xiao Wang,Liang-Xing Zhang,Jin-Cheng Xu,Peng Xiao,Hua Xu,Shuang-Peng Wang,Kar Wei Ng
CsPbBr 3 nanoplates (NPs) have shown great potential in diverse optoelectronic applications. Despite the wonderful luminescence properties, the inherent instability of these NPs hinders their use in practical situations. Herein, a facile water-assisted strategy is reported to synthesize highly stable blue emission CsPbBr 3 NPs encapsulated in PbBr(OH). The introduction of water directly into the reaction mixture is pivotal, as it triggers the transformation of bulk CsPbBr 3 nanocubes into 2-D CsPbBr 3 NPs within the PbBr(OH) matrix, resulting in the formation of CsPbBr 3 @PbBr(OH) microbricks. Remarkably, the water content in the reaction mixture allows the control of the number of perovskite layers in the NPs, thus enabling the emission color to be tuned from deep blue to green. The unconventional approach presented herein not only offers a cost-effective pathway to synthesize blue-emitting perovskites which are highly stable in a wide variety of polar and non-polar solvents, but also holds immense potential for propelling the advancement of high-performance LEDs and other optoelectronic devices. The findings underscore the significance of water in dictating the growth dynamics and emission characteristics of perovskite NPs, paving the way for their practical application.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 18
·15061-15067
·
IF 3.201
Jing Ma,Bing Yan
We prepared multi-component luminescent hybrid films based on a silicon chip by a covalent functionalization strategy of both metal–organic frameworks (ZIF-90) and lanthanide complexes. Herein the Si chip is firstly covalently modified by aminopropyltriethoxysilane (APTES) via a hydrolysis and condensation reaction, and then ZIF-90 is covalently grafted onto the surface of Si chip through imine condensation with APTES to form the hybrid films (Si-APTES-ZIF-90). Ternary lanthanide complexes with 3-methacryloxypropyltrimethoxysilane (MPTMS) and Phen (1,10-phenanthroline) are introduced to the above film systems through MPTMS as a covalent linker. The final multi-component hybrid films (Phen-Ln-MPTMS-Si-APTES-ZIF-90) display the typical Ln3+ (Ln = Eu, Tb, Sm and Dy) luminescence through the energy transfer from the MPTMS-Si-APTES-ZIF-90 host. Moreover, fine tuning of the luminescence color for these films is discussed by adjusting the excitation wavelength. Phen-Ln-MPTMS-Si-APTES-ZIF-90 (Ln = Eu, Sm, Dy) can exhibit white color emission closely by selective excitation. In addition, the consolidation stability under airflow of the film and the luminescence stability of the film under certain humidity environments are discussed.
研究领域:
材料科学
·
化学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）