论文标题
具有激子/自由载体杂种性质的全有机钙钛矿微腔中的激光机制阐明激光机制
Elucidation of lasing mechanism in all-inorganic perovskite microcavity with exciton/free-carrier hybrid nature
论文作者
论文摘要
对于包括激光器设备在内的各种光电应用，铅壁钙化盐是高度希望的。但是，尚未系统地研究描述该材料家族的激光行为的基本光物理学，因此详细的激光机制仍然蒙上了面纱。在这里，我们证明了一个全无机钙钛矿显示基于新原理的激光发射。一系列光致发光实验结果表明，CSPBBR3单晶的激发态表现出自由载体性质。另一方面，以微腔的形式，CSPBBR3单晶显示了极化激发态的发射，证明了激发性质的共存。还清楚地观察到了室温极化激光。这种前所未有的机制，即基于自由载体储层的极化激光，是通过CSPBBR3的激子/自由载体混合性质来完成的。
Lead-halide perovskites are highly promising for various optoelectronic applications including laser devices. However, fundamental photophysics describing the lasing behaviour in this material family have not been investigated systematically, and thus the detailed lasing mechanism remains veiled. Here, we demonstrate that an all-inorganic perovskite shows a lasing emission based on a novel principle. A series of photoluminescence experiment results reveals that the excited state of CsPbBr3 single crystal exhibits free carrier nature. In a form of microcavity, on the other hand, the CsPbBr3 single crystal shows emission from polaritonic excited state, demonstrating the coexistence of excitonic nature. Room temperature polariton lasing is also clearly observed. This unprecedent mechanism, i.e. polariton lasing based on free-carrier reservoir, is accomplished by the exciton/free-carrier hybrid nature of CsPbBr3.
