氨基酸辅助增强Cs3Cu2I5钙钛矿荧光粉及其蓝光LED的性能研究

摘要/Abstract

摘要： 本文采用简单的室温球磨法制备了一系列L-组氨酸(L-His)和5-氨基戊酸(5-Ava)修饰的Cs₃Cu₂I₅钙钛矿荧光粉,并对Cs₃Cu₂I₅∶x%L-His和Cs₃Cu₂I₅∶x%5-Ava(x=0、0.5、1、1.5、2)样品的物相、形貌、光学和稳定性进行了分析。氨基酸添加未对Cs₃Cu₂I₅钙钛矿的晶体结构造成影响,Cs₃Cu₂I₅仍属于Pnma空间群,但氨基酸的加入对钙钛矿的晶粒尺寸有一定的限制作用,并有效改善了其光电性能。当x=1时,经L-His和5-Ava修饰的Cs₃Cu₂I₅钙钛矿较纯Cs₃Cu₂I₅钙钛矿的荧光强度分别提升约1.30倍和1.41倍,光致发光量子产率(PLQY)提高约25.09个百分点和30.47个百分点,荧光寿命有效延长。研究发现,性能的改善与氨基酸中氨基以及羧基基团的作用有关,氨基以及羧基基团钝化了钙钛矿的缺陷并抑制非辐射复合过程的能量损失。此外,采用L-His和5-Ava修饰的Cs₃Cu₂I₅钙钛矿荧光粉制备了蓝光发光二极管(LED),在70 mA的偏流下,该LED光效率较纯Cs₃Cu₂I₅器件分别增强达1.85倍和2.10倍,表明这类材料在LED领域有着极大的应用价值。

关键词: 钙钛矿荧光粉, Cs₃Cu₂I₅, 氨基酸修饰, 光致发光量子产率, 缺陷, 非辐射复合

Abstract: In this paper, a series of Cs₃Cu₂I₅ perovskite phosphors modified with L-histidine (L-His) and 5-aminovaleric (5-Ava) acid were prepared by simple room temperature ball milling method. The phase, morphology, optical and stability properties of Cs₃Cu₂I₅∶x%L-His and Cs₃Cu₂I₅∶x%5-Ava(x=0, 0.5, 1, 1.5, 2) perovskites were analyzed. The presence of amino acids does not change the crystal structure of Cs₃Cu₂I₅perovskite, which still belongs to the Pnma space group. However, the introduction of amino acids affects the grain size of perovskite and effectively improves its optoelectronic properties. When x=1, the fluorescence intensity of Cs₃Cu₂I₅ perovskite modified with L-His and 5-Ava increases by about 1.30 and 1.41 times compared with that of pure Cs₃Cu₂I₅ perovskite, and the photoluminescence quantum yield (PLQY) increases by 25.09 percentage points and 30.47 percentage points, respectively. The fluorescence lifetime of the modified perovskites is effectively prolonged. It is found that the improvement in performance may be related to the function of amino and carboxyl groups in amino acids, which blunts the defects of perovskites and inhibits energy loss in non-radiative recombination processes. In addition, the blue light-emitting diode (LED) was prepared by Cs₃Cu₂I₅ perovskite phosphor modified with L-His and 5-Ava acid, and the respective light efficiency is 1.85 and 2.10 times higher than that of pure Cs₃Cu₂I₅ device under biased current of 70 mA, indicating that such materials have great application value in the LED field.

Key words: perovskite phosphor, Cs₃Cu₂I₅, amino acids modification, PLQY, defect, non-radiative recombination

中图分类号:

TQ422
TB34

许泽尧, 熊浩, 李平, 洪锦泉, 杨爱军, 江琳沁. 氨基酸辅助增强Cs₃Cu₂I₅钙钛矿荧光粉及其蓝光LED的性能研究[J]. 人工晶体学报, 2023, 52(9): 1681-1690.

XU Zeyao, XIONG Hao, LI Ping, HONG Jinquan, YANG Aijun, JIANG Linqin. Enhancing Performance of Cs₃Cu₂I₅ Perovskite-Based Phosphors and Its Blue LEDs under the Assistance of Amino Acids[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2023, 52(9): 1681-1690.

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氨基酸辅助增强Cs₃Cu₂I₅钙钛矿荧光粉及其蓝光LED的性能研究

Enhancing Performance of Cs₃Cu₂I₅ Perovskite-Based Phosphors and Its Blue LEDs under the Assistance of Amino Acids

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