The recombination mechanisms leading to amplified spontaneous emission at the true-green wavelength in CH3NH3PbBr3 perovskites
The recombination mechanisms leading to amplified spontaneous emission at the true-green wavelength in CH3NH3PbBr3 perovskites
复制标题
DOI：
10.1063/1.4913463
复制
发表时间：
2015-02-23
影响因子：
4
通讯作者：
Ooi, B. S.
中科院分区：
文献类型：
--
作者：
Priante, D.;Dursun, I.;Ooi, B. S.
我们用低温、功率相关(77K)和温度相关的光致发光(PL)研究了CH3NH3PbBr3杂化钙钛矿材料中的辐射复合机制。发现了两个与颗粒尺寸不均匀有关的束缚-激子辐射跃迁。由于激子峰同时发生蓝移和红移，这两个跃迁都导致了光致发光光谱的展宽。聚二甲基硅氧烷包裹的CH3NH3PbBr3粉末在高荧光激发下产生红移的束缚激子峰，其真绿光波长为553 nm。最终获得了激发阈值能量约为350微焦耳/厘米(2)的放大自发辐射。我们的研究结果为固态照明和显示应用中的真绿色发光器件提供了一个潜在的扩展平台。(C)2015年作者(S)。除另有说明外，所有文章内容均按照知识共享署名3.0未移植许可进行许可。
We investigated the mechanisms of radiative recombination in a CH3NH3PbBr3 hybrid perovskite material using low-temperature, power-dependent (77 K), and temperature-dependent photoluminescence (PL) measurements. Two bound-excitonic radiative transitions related to grain size inhomogeneity were identified. Both transitions led to PL spectra broadening as a result of concurrent blue and red shifts of these excitonic peaks. The red-shifted bound-excitonic peak dominated at high PL excitation led to a true-green wavelength of 553 nm for CH3NH3PbBr3 powders that are encapsulated in polydimethylsiloxane. Amplified spontaneous emission was eventually achieved for an excitation threshold energy of approximately 350 mu J/cm(2). Our results provide a platform for potential extension towards a true-green light-emitting device for solid-state lighting and display applications. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.