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Crystal rigidifying strategy toward hybrid cadmium halide to achieve highly efficient and narrowband blue light emission
Authors:Jian-Qiang Zhao  Hui Ge  Yu-Fang Wu  Wen-Jie Xu  Kai Xu  Jia-Qian Ma  Qian-Lu Yang  Cheng-Yang Yue  Xiao-Wu Lei
Institution:School of Chemistry, Chemical Engineer and Materials, Jining University, Qufu, Shandong, 273155, PR China
Abstract:Highly efficient and narrowband blue light-emitting performance is extremely crucial for the optoelectronic applications of organic-inorganic hybrid perovskites. However, the not yet viable approach has been shown to simultaneously improve photoluminescence quantum yield (PLQY) and narrow linewidth of blue light emission. Herein, a new crystal rigidifying strategy is proposed as a viable dual-optimization avenue. Specifically, we perform a post-synthetic technique on hybrid cadmium halides and successfully convert zero-dimensional (0D) DMP-0-CdBr4 to one-dimensional (1D) DMP-1-CdBr3, accompanied by luminescent transformation from sky-blue (470 nm) to deep-blue (432 nm) emissions. The structural evolution from discrete block to infinite chain significantly enhances the crystal rigidity, which results in narrower emission linewidth (89 to 50 nm) and increased color purity (74.5% to 96.7%). Synchronously, the PLQY also realizes a notable enhancement from 14.0% to 52.3%. Systematical characterizations demonstrate that enhanced crystal rigidity simultaneously weakens the electron-phonon interaction and slows down nonradiative decay, which narrows the emission linewidth and boosts the PLQY. The highly efficient light-emitting performance enables them as excellent down-conversion blue phosphors to fabricate solid-state LED giving bright warm white light with high color rendering index of 95.4. This work paves a novel structural optimization way to rationally design or fine-tune high-performance blue-light emitting halides.
Keywords:Hybrid halide perovskites  Blue emission  Single-crystal to single-crystal transformation  Higher PLQY  Narrow FWHM
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