八面体
发光
钙钛矿(结构)
结晶学
卤化物
阳离子聚合
材料科学
猝灭(荧光)
带隙
化学
晶体结构
无机化学
荧光
光学
光电子学
物理
高分子化学
作者
Bingqi Wang,Pan Liu,Alberto J. Fernández‐Carrión,Hui Fu,Xue-Wen Zhu,Xing Ming,Weixiong You,Zongliang Xiao,Mingxue Tang,Xiuyun Lei,Congling Yin,Fengqi Lu
标识
DOI:10.1002/asia.202400447
摘要
Abstract The In‐based double perovskite halides have been widely studied for promising optical‐electric applications. The halide hexagonal perovskite Cs 2 LiInCl 6 was isolated using solid‐state reactions and investigated using X‐ray diffraction and solid‐state NMR spectra. The material adopts a 12‐layered hexagonal structure (12 R ) consisting of layered cationic orders driven by the cationic charge difference and has Li + cations in the terminal site and In 3+ in the central site of face‐shared octahedron trimers. Such a cationic ordering pattern is stabilized by electrostatic repulsions between the next‐nearest neighboring cations in the trimers. The LiCl 6 octahedron displays large distortion and is confirmed by 7 Li SS NMR in the Cs 2 LiInCl 6 . The Cs 2 LiInCl 6 material has a direct bandgap of ~4.98 eV. The Cs 2 LiInCl 6 : Mn 2+ displays redshift luminescence (centered at ~610–622 nm) from the substituted Mn 2+ emission in octahedron with larger PLQY (17.8 %–48 %) compared with that of Cs 2 NaInCl 6 : Mn 2+ . The Mn‐doped materials show luminescent concentration quenching and thermal quenching. The composition Cs 2 Li 0.99 In 0.99 Mn 0.02 Cl 6 exhibits the highest PL intensity, a maximum PLQY of 48 %, and high luminescent retention rate of ~86 % below 400 K and is suitable for application for pc‐LED. These findings contribute to our understanding of the chloride perovskites and hold potential for widespread optical applications.
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