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Hidden Photoexcitations Probed by Multipulse Photoluminescence

Marunchenko, Alexandr LU ; Kumar, Jitendra LU ; Tatarinov, Dmitry ; Pushkarev, Anatoly P. ; Vaynzof, Yana and Scheblykin, Ivan G. LU orcid (2024) In ACS Energy Letters 9(12). p.5898-5906
Abstract

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 show that this approach cannot directly detect hidden photoexcitations with much slower dynamics than the photoluminescence decay. We demonstrate a new method based on a multipulse excitation scheme that enables an unambiguous detection and an easily interpreted tracking of these hidden species. The multipulse 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... (More)

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 show that this approach cannot directly detect hidden photoexcitations with much slower dynamics than the photoluminescence decay. We demonstrate a new method based on a multipulse excitation scheme that enables an unambiguous detection and an easily interpreted tracking of these hidden species. The multipulse 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.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS Energy Letters
volume
9
issue
12
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85209732124
ISSN
2380-8195
DOI
10.1021/acsenergylett.4c02404
language
English
LU publication?
yes
id
fc49d43b-8299-4c01-98b4-a127d767da28
date added to LUP
2025-02-04 10:06:57
date last changed
2025-06-19 12:59:22
@article{fc49d43b-8299-4c01-98b4-a127d767da28,
  abstract     = {{<p>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 show that this approach cannot directly detect hidden photoexcitations with much slower dynamics than the photoluminescence decay. We demonstrate a new method based on a multipulse excitation scheme that enables an unambiguous detection and an easily interpreted tracking of these hidden species. The multipulse 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.</p>}},
  author       = {{Marunchenko, Alexandr and Kumar, Jitendra and Tatarinov, Dmitry and Pushkarev, Anatoly P. and Vaynzof, Yana and Scheblykin, Ivan G.}},
  issn         = {{2380-8195}},
  language     = {{eng}},
  number       = {{12}},
  pages        = {{5898--5906}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Energy Letters}},
  title        = {{Hidden Photoexcitations Probed by Multipulse Photoluminescence}},
  url          = {{http://dx.doi.org/10.1021/acsenergylett.4c02404}},
  doi          = {{10.1021/acsenergylett.4c02404}},
  volume       = {{9}},
  year         = {{2024}},
}