Small
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2025
·Vol. 21
·期 21
·2502827
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IF 12.1
Pei Cai,Xiaotong Yu,Zhijun Wang,Meng Cao,Xinxin Yang,Yusong Du,Jing-Tai Zhao,Juanjuan Xing,Jiye Zhang,Kai Guo
The IV-VI compound SnSe is an environmentally friendly and high-performance thermoelectric material with intrinsically low lattice thermal conductivity. Recent research efforts have focused on enhancing carrier concentration and effective mass to improve power factors, thereby achieving superior thermoelectric performance as reflected in the figure of merit ZT . In context of the anisotropic crystal structure of SnSe, this study utilized a hydrothermal method to synthesize Rb-doped SnSe nanosheets. Rb acts as an acceptor dopant, increasing the hole concentration to 2.0 × 10 19 cm −3 and promoting second valence band participation in transport at room temperature, significantly elevating the ZT value of polycrystalline SnSe to 1.41 at 773 K. Furthermore, texture engineering was implemented through a secondary sintering process. This approach facilitates the organized stacking of grains with highly preferred orientations, resulting in a notable improvement of hole mobility perpendicular to the pressure direction to further increase the power factor. By synergistically combining carrier concentration optimization with texture engineering strategies, an exceptional ZT value of 1.74 at 773 K was achieved in polycrystalline SnSe. This work presents a cost-effective, straightforward, and low-temperature synthesis route for the large-scale production of high-performance SnSe thermoelectric materials, offering significant potential for practical applications in energy harvesting and conversion.
研究领域:
材料科学
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热电学
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纳米材料
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能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2025
·Vol. 12
·期 5
·2003-2012
·
IF 6.4
Zhen Chen,Chuang Zhang,Yuanjing Wang,Hong Ming,Yayun Zhou,Enhai Song,Qinyuan Zhang
Mn4+ activated fluorides are crucial for lighting and displays, owing to their unique narrowband red emission and broadband blue light excitation. However, designing target red phosphors that simultaneously possess appropriate chromaticity coordinates, short fluorescence lifetimes, and high quantum efficiencies (QEs) remains a significant challenge. Herein, by employing a synergistic strategy of the growth of single-crystal phosphors combined with a heterovalent co-doping approach, shorter fluorescence lifetimes (4.93 ms), excellent chromaticity coordinates (0.7001, 0.2998), and high external QE (EQE, 50.91%) are first achieved in the Rb2NaAlF6:Mn4+,Mg2+ (RNAFMM-C) single-crystal red phosphor. The significant increase in EQE (from 13.19% to 50.91%) is attributed to the single-crystal morphology with defect-rare and low surface energy, and the increased distortion of the [MnF6]2− octahedron, which breaks the partial parity-forbidden transition selection law. Additionally, the crystal samples of RNAFMM-C exhibit superior moisture resistance. More importantly, combining the RNAFMM-C, commercial green phosphor β-SiAlON:Eu2+ and blue InGaN chip, an emitting device with a high luminous efficiency of 118.48 lm W−1 and a wide color gamut of 109.20% National Television Standards Committee (NTSC) is further demonstrated, and it shows good potential in projectors. RNAFMM-C is a promising red-light component for the next generation of wide gamut displays.
研究领域:
材料科学
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光学材料
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固态照明
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显示技术
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-11
·
IF 36.3
Liu Jianbo,Zhang Meng,Sun Xiaoran,Xiang Linhu,Yang Xiangyu,Hu Xin,Wang Zhicheng,Hou Tian,Qin Jinzhao,Huang Yuelong,Abdi-Jalebi Mojtaba,Hao Xiaojing
RbI is the most effective in mitigate PbI 2 precipitation caused by Pb(SCN) 2 while maintaining large grains.
Rb is kept at the grain boundaries during crystallization and Ostwald ripening, contributes to a slow growth of the grains.
Wide-bandgap perovskite solar cells with blade-coated perovskite in air achieved a certified power conversion efficiency of 23%, among the highest values reported.
研究领域:
材料科学
·
光伏技术
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薄膜技术
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纳米技术
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固体物理
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产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Changjiang Shi,Haihua Zhang,Haolun Li,Hongbing Fu
Blue-green lasers are essential for next-generation optoelectronics. While GaN-InGaN lasers offer excellent performance, their complex fabrication and challenges in precise bandgap tuning remain significant limitations. Hybrid lead halide perovskites present a promising alternative, with tunable bandgaps and cost-effective solution processing. However, halide migration in these materials causes spectral instability and luminescence shifts under operational conditions. Here, a novel class of Rb-Cs alloyed quasi-2D perovskites is introduced that achieve both low amplified spontaneous emission (ASE) thresholds and exceptional spectral stability. By precisely tuning the Rb-Cs ratio, it realizes ASE across the blue-green spectrum (481–532 nm). Rb-Cs alloying critically modulates the quantum well distribution, optimizes the energy landscape, and suppresses Auger recombination, resulting in a record-low ASE threshold of 1.94 µJ·cm −2 —over 50% lower than that of mixed-halide perovskites. These materials exhibit remarkable spectral robustness, with ASE spectra remaining stable even after prolonged thermal annealing, thereby overcoming halide migration-induced degradation. Furthermore, micro-ring laser arrays fabricated from these Rb-Cs alloyed perovskites demonstrate superior lasing characteristics, including high-quality whispering-gallery-mode resonances and low lasing thresholds, underscoring their potential for advanced laser technologies.
研究领域:
光电子学
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材料科学
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光子学
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半导体激光器
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钙钛矿光电器件
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激光技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）