Open AccessPressure‐assisted cooling to grow ultra‐stable Cs 3 Cu 2 l 5 and CsCu 2 l 3 single crystals for solid‐state lighting and visible light communication
Author(s) -
Wang Baiqian,
Chen Chen,
Yang Xin,
Cai Wensi,
Zhao Shuangyi,
Li Ru,
Ma Wen,
Chen Jiangzhao,
Zang Zhigang
Publication year - 2022
Publication title -
ecomat
Language(s) - English
Resource type - Journals
ISSN - 2567-3173
DOI - 10.1002/eom2.12184
Subject(s) - halide , diode , materials science , optoelectronics , optics , chemistry , physics , inorganic chemistry
Owing to the excellent optical properties, white light‐emitting diodes (WLEDs) based on metal halide perovskites have attracted great attention as promising light source for solid‐state lighting and wireless visible light communication (VLC). However, the instability and toxicity of classic hybrid lead halides hinder their practical applications. Here, a pressure‐assisted cooling method is developed to grow lead‐free Cs 3 Cu 2 I 5 and CsCu 2 I 3 single crystals, which exhibit more excellent stability, larger size and uniform orientations in comparison with pressure‐free cooling method. Then, both single crystals are used as the emitters of WLEDs without encapsulation, exhibiting a high Color Rendering Index of 91, a decent Commission Internationale de l'Eclairage coordinate of (0.33, 0.33), a proper Correlated Color Temperature of 5436 K, as well as an excellent 1350‐h operating stability at atmosphere. Furthermore, the prepared WLEDs are utilized in wireless VLC, which possesses a −3 dB bandwidth of 10.1 MHz.