光致发光
材料科学
兴奋剂
拉曼光谱
量子产额
发射光谱
电子
声子
自发辐射
晶体结构
光电子学
谱线
凝聚态物理
分析化学(期刊)
分子物理学
光学
结晶学
物理
荧光
激光器
天文
量子力学
化学
色谱法
作者
Yukui Zhang,Haolin Lu,Rui Yun,Huanxin Yang,Yuling Liu,Zhaoyu Wang,Song Wang,Guankui Long,Xiyan Li
标识
DOI:10.1002/adom.202400184
摘要
Abstract Lead‐free perovskites exhibit unique crystal structures and optical properties due to their low‐dimensional structure. However, the 0D structure of Cs 2 InCl 5 ·H 2 O usually demonstrates poor optical properties at room temperature due to their extremely strong electron–phonon coupling interaction. In this study, a doping strategy is employed by introducing Pb 2+ into Cs 2 InCl 5 ·H 2 O, resulting in the achievement of an efficient broadband blue emission, with a photoluminescence quantum yield (PLQY) of 58%. The temperature‐dependent PL spectra reveal that the efficient emission is attributed to the weakening of the electron–phonon coupling strength in the lattice and the inhibition of the phonon‐assisted non‐radiative recombination process through Pb 2+ doping. The validity of this deduction is further corroborated by the results of the Raman spectra. The results of the first‐principle calculation demonstrate that the broadband emission originates from multiple emission paths in In 3+ and Pb 2+ polyhedrons. In addition, Pb 2+ ‐doped Cs 2 InCl 5 ·H 2 O can realize the transformation from sky‐blue emission to deep‐blue emission by absorbing water in the air. Remarkably, this change is reversible during the heating–cooling cycles, demonstrating excellent optical stability with repeatable recyclability.
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