Highly Luminescent One-Dimensional Organic-Inorganic Hybrid Double-Perovskite-Inspired Materials for Single-Component Warm White-Light-Emitting Diodes

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)(MInBr6)-In-I (DFPD=4,4-difluoropiperidinium, M-I=K+ and Rb+). Highly efficient warm-white photoluminescence quantum yield of 92 % is achieved by doping 0.3 % Sb3+ in (DFPD)(2)KInBr6. Furthermore, single-component warm-WLEDs fabricated with (DFPD)(2)KInBr6: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.

Automated summary

Double perovskites (DPs) are promising candidates for white light-emitting diodes (WLEDs) due to their intrinsic broadband emission. In this study, a series of highly luminescent one-dimensional DP-inspired materials were synthesized using a fluorinated organic cation, and efficient warm-white photoluminescence was achieved. By doping a small amount of antimony ion, lead-free metal-halide WLEDs with superior performance were fabricated.