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

Junsheng Chen, Pavel Chábera, Torbjörn Pascher, Maria E. Messing, Richard D Schaller, Sophie Canton, Kaibo Zheng, Tõnu Pullerits

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)5119-5124
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume8
Issue number20
DOIs
Publication statusPublished - Oct 19 2017

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Perovskite
Nanocrystals
nanocrystals
Photons
photons
Photoluminescence
excitation
photoluminescence
absorption cross sections
life (durability)
Cesium
Laser spectroscopy
Optical materials
optical materials
Optical devices
perovskite
laser spectroscopy
Excited states
cesium
lasing

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Enhanced Size Selection in Two-Photon Excitation for CsPbBr3 Perovskite Nanocrystals. / Chen, Junsheng; Chábera, Pavel; Pascher, Torbjörn; Messing, Maria E.; Schaller, Richard D; Canton, Sophie; Zheng, Kaibo; Pullerits, Tõnu.

In: Journal of Physical Chemistry Letters, Vol. 8, No. 20, 19.10.2017, p. 5119-5124.

Research output: Contribution to journalArticle

Chen, J, Chábera, P, Pascher, T, Messing, ME, Schaller, RD, Canton, S, Zheng, K & Pullerits, T 2017, 'Enhanced Size Selection in Two-Photon Excitation for CsPbBr3 Perovskite Nanocrystals', Journal of Physical Chemistry Letters, vol. 8, no. 20, pp. 5119-5124. https://doi.org/10.1021/acs.jpclett.7b02178
Chen, Junsheng ; Chábera, Pavel ; Pascher, Torbjörn ; Messing, Maria E. ; Schaller, Richard D ; Canton, Sophie ; Zheng, Kaibo ; Pullerits, Tõnu. / Enhanced Size Selection in Two-Photon Excitation for CsPbBr3 Perovskite Nanocrystals. In: Journal of Physical Chemistry Letters. 2017 ; Vol. 8, No. 20. pp. 5119-5124.
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AU - Schaller, Richard D

AU - Canton, Sophie

AU - Zheng, Kaibo

AU - Pullerits, Tõnu

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