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

Abstract

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

CLC Number:

TQ422
TB34

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

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