ACS Applied Nano Materials
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2024
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IF 5.3
Kai Zhao,Zhen Bao,Qi Liu
CsPbX3 (X = Cl, Br, and I) perovskite nanocrystals (PNCs) have been recognized as potential optoelectronic materials due to their excellent optical characteristics. However, their poor stability limits their further practical application, and research on their stability improvement mainly concentrated on green-emitted CsPbBr3 PNCs. Herein, high-stable red, green, and blue three-primary color CsPbX3-nanocrystal/SiO2 (PNC/SiO2) luminescent composites have been synthesized by a simple high-temperature melt-crystallization method, which did not use any solvent or ligand. The sintering conditions for PNC/SiO2 composites were optimized according to the X-ray diffraction and photoluminescence (PL) spectra, which ensured the composite structures and achieved higher PL quantum yield. The optimized red, green, and blue composites can remain at 99%, 90%, and 82% PL intensity after 15 heating loops, performing good thermal stability. To check the application potential, the optimized composites were fabricated as red, green, and blue light-emitting diodes (LEDs), showing high color purity to consist of a wide color gamut. The red, green, and blue LEDs remained at 83%, 82%, and 96% emission intensity and kept their color coordinates after a long working duration, showing excellent stability. The excellent stability and relatively higher color purity of the PNC/SiO2 composites indicate their great potential for commercial background display applications.
研究领域:
材料科学
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光学工程
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显示技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Wenbin Shi,Xiao Zhang,Cong Xie,Hsueh Shih Chen,Ping Yang
To overcome the poor stability of metal halide perovskite nanocrystals (NCs) prepared in organic solvents, a solid reaction method at high temperature was developed using sol–gel porous SiO 2 as a reactor. Sol-gel SiO 2 powders were used to encapsulate CsPbX 3 NCs at high temperatures (600–800 °C) in air to get SiO 2 /CsPbX 3 glass by dispersing growth cites in advance and no ligands added. After NaOH etching, a thin dense SiO 2 shell was remained on the surface of CsPbX 3 NCs (named as CsPbX 3 @SiO 2 ).The photoluminescence (PL) quantum yield of the CsPbX 3 @SiO 2 was 86.7 %, in which their PL peak wavelengths were adjusted from 410-707 nm by changing halogen components. The dense SiO 2 shell on CsPbX 3 NCs blocked the connection of CsPbX 3 cores with water and oxygen in the external environment, resulting in CsPbX 3 @SiO 2 revealed extraordinary high stability. After immersing in water for half year, the PL intensity of CsPbX 3 @SiO 2 composites was remained unchanged and the composites still revealed bright PL after heat-treating in boiling water for 14 h. These highly stable composites were used to fabricate a white light-emitting diode, in which the color coordinates are located at (0.36, 0.33), and the color temperature reaches 5169 K which belongs to the warm white light range.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2020
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IF 3.28
Rui Zhang,Yaoxin Yuan,Jinhong Li,Zhenxing Qin,Qingmei Zhang,Bangyun Xiong,Zesong Wang,Fenghua Chen,Xiujuan Du,Wen Yang
All-inorganic lead halide perovskite nanocrystals (NCs) as new emerging semiconducting luminescent materials have attracted tremendous attention for designing optoelectronic devices . We have synthesized high quality of the CsPbX 3 NCs with tunable entire visible spectral region by a modified lower temperature method, featured with facile, low-cost and easily operating in an open environment without vacuumization or glovebox system. Besides, we have investigated the incorporation of Ni and K ions into CsPbX 3 NCs by adjusting all kinds of composition concentration from halogen salts, based on above mentioned preparation method. The absolute photoluminescence quantum yields (PLQYs) of doped CsPbX 3 NCs with different dopant (Ni or K ions) concentration were discussed. It is found that a certain amount of doping is beneficial for suppressing the defects and improving the lattice structure of nanocrystals, whereas an excessive dopant may induce quenching centers of the emission. In addition, a glorious absolute PLQYs of doped CsPbX 3 NCs can be obtained by our method, especially for CsPbBr 3 and CsPbI 3 NCs, and nearly reach 80%.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xin Li,Qi-Wen Ma,Guangning Yu,Ji Shi,Hai-Yang Chang,Rong-Rong Zheng,Hengxue Xiang,Cheng Wang
All-inorganic halide perovskite (CsPbX3) nanocrystals (NCs) have garnered significant attention due to their excellent photoelectric properties. However, their practical application has been limited by stability issues. This study presents a strategy combining physical confinement through a carrier matrix and chemical bond coupling to enhance the stability of CsPbX3 NCs significantly under UV irradiation, polar solvents, and thermal conditions. Specifically, CsPbBr3 NCs exhibited near-complete fluorescence quenching within 300 min when treated with water and ethanol. In contrast, CsPbBr3/DMSNs-NH2 nanocomposites retained 86.9% and 75.4% of their initial photoluminescence intensity after 7 days. This enhanced stability is attributed to the multilevel pore architecture of DMSNs-NH2, which effectively prevents direct interaction with water and oxygen. Furthermore, bright white light-emitting diode (LED) devices were successfully fabricated using these nanocomposites, achieving a color temperature of 6045 K and a color gamut covering 133.5% of NTSC and 99% of Rec.2020 standards. This work demonstrates a promising pathway for the development of stable, high-performance perovskite-based optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）