卤化物
光致发光
钙钛矿(结构)
激子
联轴节(管道)
斯托克斯位移
材料科学
电子
声子
光电子学
化学
凝聚态物理
无机化学
物理
结晶学
发光
冶金
量子力学
作者
Long Zhang,Yuanyuan Fang,Laizhi Sui,Jiejuan Yan,Kai Wang,Kaijun Yuan,Wendy L. Mao,Bo Zou
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2019-11-13
卷期号:4 (12): 2975-2982
被引量:110
标识
DOI:10.1021/acsenergylett.9b02155
摘要
Lead-free halide double perovskites have been proposed as candidates to replace Pb-halide perovskites in photovoltaic and optoelectronic applications due to their enhanced stability and nontoxicity. However, the limited understanding of the fundamental properties of halide double perovskites represents a hurdle to further improvement of their device performance. Our experimental studies demonstrate that the broad emission of Cs2AgBiCl6 with a large Stokes shift stems primarily from exciton self-trapping owing to strong electron–phonon coupling. An unusual blue shift of the emission accompanied by a red shift of the absorption edge occurred due to the reduced lattice relaxation energy upon lattice compression in the cubic phase. Electron–phonon coupling reduction is critical to the enhancement of photoluminescence intensity and tuning emission range in Cs2AgBiCl6 under high pressure. The structure–property relationships illuminated by our work can provide the basis for improving the performance of halide double perovskites.
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