Zhang Guoxing, Jiang Dongliang, Zhu Xinghua, Lan Yuemei, Wang Dong, Zhang Xuejie, Wang Bo, Gao Yan, Zeng Qingguang, Chen Yan
School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong 529020, P. R. China.
College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
Dalton Trans. 2023 Aug 1;52(30):10378-10385. doi: 10.1039/d3dt00499f.
Inorganic lead halide perovskite quantum dots (CsPbX QDs (X = Cl, Br, or I)) have attracted more and more attention due to their high absorption coefficient, narrow emission band, high quantum efficiency, and tunable emission wavelength. However, CsPbX QDs are decomposed when exposed to bright light, heat, moisture, ., which leads to severe luminous attenuation and limits their commercial application. In this paper, CsPbBr@glass materials were successfully synthesized by a one-step self-crystallization method, including melting, quenching and heat treatment processes. The stability of CsPbBr QDs was improved by embedding CsPbBr QDs into zinc-borosilicate glass. Then, the CsPbBr@glass was combined with polyurethane (PU) to form a flexible composite luminescent film CsPbBr@glass@PU. This strategy enables the transformation of rigid perovskite quantum dot glass into flexible luminescent film materials and further improves the photoluminescence quantum yield (PLQY) from 50.5% to 70.2%. The flexible film has good tensile properties, and its length can be strained 5 times as long as the original length. Finally, a white LED was encapsulated by combining CsPbBr@glass@PU film and red phosphor KSiF:Mn with a blue LED chip. The good performance of the obtained CsPbBr@glass@PU film indicates that it has potential application in flexible liquid crystal displays (LCDs) as a backlight source.
无机铅卤化物钙钛矿量子点（CsPbX量子点，X = Cl、Br或I）因其高吸收系数、窄发射带、高量子效率和可调节发射波长而受到越来越多的关注。然而，CsPbX量子点在强光、热、湿气等条件下会分解，这导致严重的发光衰减并限制了它们的商业应用。本文通过一步自结晶法成功合成了CsPbBr@玻璃材料，包括熔融、淬火和热处理过程。通过将CsPbBr量子点嵌入硼硅酸锌玻璃中来提高CsPbBr量子点的稳定性。然后，将CsPbBr@玻璃与聚氨酯（PU）结合形成柔性复合发光薄膜CsPbBr@玻璃@PU。这种策略能够将刚性钙钛矿量子点玻璃转变为柔性发光薄膜材料，并进一步将光致发光量子产率（PLQY）从50.5%提高到70.2%。该柔性薄膜具有良好的拉伸性能，其长度可拉伸至原来的5倍。最后，通过将CsPbBr@玻璃@PU薄膜与红色荧光粉KSiF:Mn和蓝色LED芯片结合封装成白色LED。所获得的CsPbBr@玻璃@PU薄膜的良好性能表明它作为背光源在柔性液晶显示器（LCD）中具有潜在应用。
