Photonics
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2023
·Vol. 10
·期 10
·1113
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IF 2.4
Junhu Cai,Xiaogang Chen,Wenyan Zhang,Longwen Yang,Zexi Lin,Wenxiao Zhao,Yun Ye,Sheng Xu,Tailiang Guo,Enguo Chen
Owing to their composition-tunable and narrow emissions and high photoluminescence quantum yield (PLQY), inorganic halide perovskite quantum dots (IPQDs) are a promising option for wide color gamut displays. However, their practical applications have been limited by their lattice structure instability and surface defect states. Herein, CsPbBr3:KBF4@SiO2with improved stability and optical properties is successfully synthesized with a two-step optimization of fluorine (F) anion doping and SiO2in situ coating. Compared with bromide (Br), higher electronegativity and a smaller radius of F lead to stronger binding energy with Pb2+. Also, F anions can occupy surface Br vacancies. Then, benefiting from the acidic environment provided by BF4−hydrolysis, tetraethyl orthosilicate (TEOS) can be more easily hydrolyzed on the CsPbBr3:KBF4surface to generate SiO2coating, thus further passivating lattice defects and improving environmental stability. Importantly, the PLQY of CsPbBr3:KBF4@SiO2achieves 85%, and the stability has been greatly improved compared with pure CsPbBr3. Finally, CsPbBr3:KBF4@SiO2/PDMS, CsPbI3/PDMS, and CsPbCl3/PDMS composites with narrow emissions are applied to replace traditional phosphors as color converters for direct-view light-emitting diode (LED) displays or liquid crystal display (LCD) backlights. The color gamut reaches 118.22% under the NTSC standard. Concerning the display field, it suggests likely applications in the future.Keywords:CsPbBr3;KBF4;SiO2;wide color gamut;liquid crystal displays;LED displays
研究领域:
材料科学
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光学工程
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DOI
高影响因子
ADVANCED MATERIALS
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2025
·
IF 26.8
Xinyi Lv,Yuqin Su,Hengyang Xiang,Linxiang Yang,Xinrui Chen,Yifei Wang,Kun Zhang,Jiahao Tang,Yuhui Ye,Bo Cai,Xueying Ma,Xiaoyong Wang,Haibo Zeng
Perovskite quantum dots (PQDs) are expected to be an ideal candidate for wide-color gamut displays owing to their high color purity. However, their color purity is challenged by remarkable spectral broadening due to non-uniform size distribution and crystal defects. Here, a ligand-ion (TOP-Zn) complex-modulating nucleation strategy is proposed to depress spectral broadening. This is achieved by enhancing the steric hindrance effect during lead-halogen octahedral assembly and reducing the reaction activity/sites of the system. This strategy is universal and has been confirmed to be effective for blue, green, and red PQDs, achieving narrowed spectral full-width-at-half-maximum (FWHM) of 15, 17, and 25 nm, respectively. These FWHMs are record-breaking and contribute to a wide color gamut coverage of ≈130% National Television Standards Committee and ≈100% Rec. 2020 standard. Meanwhile, these PQD-based light-emitting diodes (PeLEDs) exhibit a high external quantum efficiency (EQE) of exceeding 20% at their pure color range. These results provide a feasible path to achieve ultra-uniform and pure-color luminescent PQDs for wide-color gamut displays.
研究领域:
材料科学
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纳米科技
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DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2025
·Vol. 12
·期 5
·2003-2012
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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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无机化学
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高影响因子
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