通过多脉冲光致发光探测隐藏光激发
Hidden photoexcitations probed by multi-pulse photoluminescence
AI总结：
本文提出 Read-Write-Read 多脉冲光致发光方法，用于检测常规时间分辨光致发光无法发现的慢动力学隐藏光激发，并在金属卤化物钙钛矿中实现载流子俘获过程可视化及相关参数提取。
摘要：
时间分辨光致发光是追踪发光材料中光激发载流子动力学的一种经过验证的方法。该技术探测短激光脉冲周期性激发后的光致发光衰减。本文证明，这种方法无法直接探测动力学远慢于光致发光衰减的隐藏光激发。我们展示了一种基于多脉冲激发方案的新方法，能够对这些隐藏物种进行明确检测和易于解释的追踪。多脉冲激发由单个脉冲（Read）、随后一簇间隔紧密的多个脉冲（Write）以及最后的另一个单个脉冲（Read）组成。为说明 Read-Write-Read 激发方案的有效性，我们将其应用于金属卤化物钙钛矿，以直接可视化载流子俘获、提取被俘获电荷的浓度并确定陷阱去布居的速率常数。所开发的方法允许使用一种通用、适用性强的全光学方法研究能源器件中限制性能的过程。
英文摘要：
Time-resolved photoluminescence is a validated method for tracking the photoexcited carrier dynamics in luminescent materials. This technique probes the photoluminescence decays upon a periodic excitation by short laser pulses. Herein, we demonstrate that this approach cannot directly detect hidden photoexcitations with much slower dynamics than the photoluminescence decay. We demonstrate a new method based on a multi-pulse excitation scheme that enables an unambiguous detection and an easily interpreted tracking of these hidden species. The multi-pulse excitation consists of a single pulse (Read) followed by a burst of many closely separated pulses (Write) and finally another single pulse (Read). To illustrate the efficacy of the Read-Write-Read excitation scheme, we apply it to metal halide perovskites to directly visualize carrier trapping, extract the concentration of trapped charges and determine the rate constant of trap depopulation. The developed approach allows studying performance-limiting processes in energy devices using a versatile, highly applicable all-optical method.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
