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Spatially correlated photoluminescence blinking and flickering of hybrid-halide perovskite micro-rods
Journal of Luminescence ( IF 3.6 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jlumin.2020.117202
Tejmani Behera , Nithin Pathoor , Chinmay Phadnis , Susmita Buragohain , Arindam Chowdhury

Abstract Temporally stochastic, abrupt photoluminescence (PL) intermittency (blinking) has been long recognized to be characteristic of single quantum-emitters as intensity fluctuations average out over the ensemble. While there are a few rare examples of PL blinking in spatially extended (~μm) yet quantum-confined (1 or 2-D) nanostructures, such phenomenon is in general spatiotemporally uncorrelated. However, recent investigations on organo-metal iodide perovskite nano-/micro-rods have revealed that blinking is plausible even in larger structures. Here, we report abrupt and discrete PL instability of entire individual methylammonium lead bromide (MAPbBr3) single-crystal rods of dimensions between 1 and 2 μm. Intriguingly, similar to bulk polycrystalline disks of MAPbBr3, these dimensionally unconfined micro-rods exhibit spatially-synchronous multi-level PL intermittency, on top of a slow time-varying base emission intensity. Here, we find two dominant intermittency characteristics, one of which is more abrupt (discrete) while the other is relatively gradual, designated as "blinking" and "flickering" respectively. One of the two intermittency behaviors is found to dominate in each micro-rod in the ensemble; however, both flickering and blinking have an extremely high spatial correlation of intensity fluctuations at short distances (

中文翻译:

混合卤化物钙钛矿微棒的空间相关光致发光闪烁和闪烁

摘要 时间随机的、突然的光致发光 (PL) 间歇性(闪烁)长期以来被认为是单个量子发射器的特征,因为强度波动在整体上平均。虽然有一些罕见的 PL 在空间扩展 (~μm) 但量子限制 (1 或 2-D) 纳米结构中闪烁的例子,但这种现象通常在时空上是不相关的。然而,最近对有机金属碘化物钙钛矿纳米/微米棒的研究表明,即使在较大的结构中,闪烁也是合理的。在这里,我们报告了尺寸在 1 到 2 μm 之间的整个单个甲基溴化铅 (MAPbBr3) 单晶棒的突然和离散的 PL 不稳定性。有趣的是,类似于 MAPbBr3 的块状多晶盘,除了缓慢的时变基础发射强度之外,这些尺寸上无限制的微棒还表现出空间同步的多级 PL 间歇性。在这里,我们发现了两个主要的间歇性特征,其中一个更突然(离散),而另一个则相对渐进,分别指定为“闪烁”和“闪烁”。发现两种间歇行为之一在集合中的每个微杆中占主导地位;然而,在短距离内,闪烁和闪烁都具有极高的强度波动空间相关性(
更新日期:2020-07-01
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