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Enhanced Size Selection in Two-Photon Excitation for CsPbBr3 Perovskite Nanocrystals

Chen, Junsheng LU ; Chábera, Pavel LU ; Pascher, Torbjörn LU ; Messing, Maria E. LU ; Schaller, Richard; Canton, Sophie LU ; Zheng, Kaibo LU and Pullerits, Tõnu LU (2017) In Journal of Physical Chemistry Letters 8(20). p.5119-5124
Abstract

Cesium lead bromide (CsPbBr3) perovskite nanocrystals (NCs), with large two-photon absorption (TPA) cross-section and bright photoluminescence (PL), have been demonstrated as stable two-photon-pumped lasing medium. With two-photon excitation, red-shifted PL spectrum and increased PL lifetime is observed compared with one-photon excitation. We have investigated the origin of such difference using time-resolved laser spectroscopies. We ascribe the difference to the enhanced size selection of NCs by two-photon excitation. Because of inherent nonlinearity, the size dependence of absorption cross-section under TPA is stronger. Consequently, larger size NCs are preferably excited, leading to longer excited-state lifetime and... (More)

Cesium lead bromide (CsPbBr3) perovskite nanocrystals (NCs), with large two-photon absorption (TPA) cross-section and bright photoluminescence (PL), have been demonstrated as stable two-photon-pumped lasing medium. With two-photon excitation, red-shifted PL spectrum and increased PL lifetime is observed compared with one-photon excitation. We have investigated the origin of such difference using time-resolved laser spectroscopies. We ascribe the difference to the enhanced size selection of NCs by two-photon excitation. Because of inherent nonlinearity, the size dependence of absorption cross-section under TPA is stronger. Consequently, larger size NCs are preferably excited, leading to longer excited-state lifetime and red-shifted PL emission. In a broad view, the enhanced size selection in two-photon excitation of CsPbBr3 NCs is likely a general feature of the perovskite NCs and can be tuned via NC size distribution to influence their performance within NC-based nonlinear optical materials and devices.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
8
issue
20
pages
6 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85031791367
ISSN
1948-7185
DOI
10.1021/acs.jpclett.7b02178
language
English
LU publication?
yes
id
4630a5d3-84c0-4a13-8ff7-272c4362aea4
date added to LUP
2017-10-30 13:51:49
date last changed
2017-10-31 03:00:03
@article{4630a5d3-84c0-4a13-8ff7-272c4362aea4,
  abstract     = {<p>Cesium lead bromide (CsPbBr<sub>3</sub>) perovskite nanocrystals (NCs), with large two-photon absorption (TPA) cross-section and bright photoluminescence (PL), have been demonstrated as stable two-photon-pumped lasing medium. With two-photon excitation, red-shifted PL spectrum and increased PL lifetime is observed compared with one-photon excitation. We have investigated the origin of such difference using time-resolved laser spectroscopies. We ascribe the difference to the enhanced size selection of NCs by two-photon excitation. Because of inherent nonlinearity, the size dependence of absorption cross-section under TPA is stronger. Consequently, larger size NCs are preferably excited, leading to longer excited-state lifetime and red-shifted PL emission. In a broad view, the enhanced size selection in two-photon excitation of CsPbBr<sub>3</sub> NCs is likely a general feature of the perovskite NCs and can be tuned via NC size distribution to influence their performance within NC-based nonlinear optical materials and devices.</p>},
  author       = {Chen, Junsheng and Chábera, Pavel and Pascher, Torbjörn and Messing, Maria E. and Schaller, Richard and Canton, Sophie and Zheng, Kaibo and Pullerits, Tõnu},
  issn         = {1948-7185},
  language     = {eng},
  month        = {10},
  number       = {20},
  pages        = {5119--5124},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry Letters},
  title        = {Enhanced Size Selection in Two-Photon Excitation for CsPbBr<sub>3</sub> Perovskite Nanocrystals},
  url          = {http://dx.doi.org/10.1021/acs.jpclett.7b02178},
  volume       = {8},
  year         = {2017},
}