Highly Luminescent One‐Dimensional Organic–Inorganic Hybrid Double‐Perovskite‐Inspired Materials for Single‐Component Warm White‐Light‐Emitting Diodes
Tianxin Bai, Xiaochen Wang, Zhongyi Wang, Sujun Ji, Xuan Meng, Qiujie Wang, Ruiling Zhang, Peigeng Han, Keli Han, Junsheng Chen, Feng Liu, Bin Yang
Abstract
Abstract Double perovskites (DPs) are one of the most promising candidates for developing white light‐emitting diodes (WLEDs) owing to their intrinsic broadband emission from self‐trapped excitons (STEs). Translation of three‐dimensional (3D) DPs to one‐dimensional (1D) analogues, which could break the octahedral tolerance factor limit, is so far remaining unexplored. Herein, by employing a fluorinated organic cation, we report a series of highly luminescent 1D DP‐inspired materials, (DFPD) 2 M I InBr 6 (DFPD=4,4‐difluoropiperidinium, M I =K + and Rb + ). Highly efficient warm‐white photoluminescence quantum yield of 92 % is achieved by doping 0.3 % Sb 3+ in (DFPD) 2 KInBr 6 . Furthermore, single‐component warm‐WLEDs fabricated with (DFPD) 2 KInBr 6 :Sb yield a luminance of 300 cd/m 2 , which is one of the best‐performing lead‐free metal‐halides WLEDs reported so far. Our study expands the scope of In‐based metal‐halides from 3D to 1D, which exhibit superior optical performances and broad application prospects.