Mechanism of Single-Photon Upconversion Photoluminescence in All-Inorganic Perovskite Nanocrystals: The Role of Self-Trapped Excitons

被引：41
|
作者：
Ma, Xiaoman [1 ,2 ]
Pan, Fang [1 ,2 ]
Li, Haoqi [1 ,2 ]
Shen, Peng [1 ,2 ]
Ma, Chao [1 ,2 ]
Zhang, Lei [1 ,2 ]
Niu, Haibo [3 ]
Zhu, Youzhang [3 ]
Xu, Shijie [4 ,5 ]
Ye, Honggang [1 ,2 ]
机构：
[1] Xi An Jiao Tong Univ, Dept Appl Phys, Xian 710049, Shaanxi, Peoples R China
[2] Xi An Jiao Tong Univ, MOE Key Lab Nonequilibrium Synth & Modulat Conden, Xian 710049, Shaanxi, Peoples R China
[3] Xi An Jiao Tong Univ City Coll, Dept Phys, Xian 710018, Shaanxi, Peoples R China
[4] Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Peoples R China
[5] Univ Hong Kong, HKU, SIRI, Pokfulam Rd, Hong Kong, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2019年 / 10卷 / 20期
基金：
中国国家自然科学基金;
关键词：
LIGHT-EMITTING-DIODES; LEAD HALIDE PEROVSKITES; QUANTUM DOTS; HIGH-EFFICIENCY; CSPBBR3; SEMICONDUCTOR; EMISSION; AIR;
D O I：
10.1021/acs.jpclett.9b02289
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The efficient single-photon upconversion photoluminescence (UCPL) feature of lead halide perovskite semiconductors makes it promising for developing laser cooling devices. This is an attractive potential application, but the underlying physics still remains unclear so far. By using the all-inorganic CsPbX3 (X = Br, I) nanocrystal samples, this phenomenon was investigated by photoluminescence (PL) and time-resolved PL under different temperatures and various excitation conditions. A broad emission band located at the low-energy side of the free exciton (FE) peak was detected and deduced to be from the self-trapped exciton (STE). The lifetime of STE emission was found to be 171 ns at 10 K, much longer than that of FE. The UCPL phenomenon was then attributed to thermal activation of transformation from STEs to FEs, and the energy barrier was derived to be 103.7 meV for CsPbBr3 and 45.2 meV for CsPb(Br/I)(3), respectively. The transformation also can be seen from the fluorescence decay processes.
引用
收藏
页码：5989 / +
页数：15
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