Spectral Fingerprint of Quantum Confinement in Single CsPbBr3 Nanocrystals

Lead halide perovskite nanocrystals are promising materials for classical and quantum light emission. To understand these outstanding properties, a thorough analysis of the band-edge exciton emission is needed, which is not reachable in ensemble and room-temperature studies because of broadening eff...

Full description

Saved in:
Bibliographic Details
Published in:Nano letters 2023-04, Vol.23 (8), p.3607-3613
Main Authors: Amara, Mohamed-Raouf, Said, Zakaria, Huo, Caixia, Pierret, Aurélie, Voisin, Christophe, Gao, Weibo, Xiong, Qihua, Diederichs, Carole
Format: Article
Language:English
Subjects:
Condensed Matter
Mesoscopic Systems and Quantum Hall Effect
Optics
Physics
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Lead halide perovskite nanocrystals are promising materials for classical and quantum light emission. To understand these outstanding properties, a thorough analysis of the band-edge exciton emission is needed, which is not reachable in ensemble and room-temperature studies because of broadening effects. Here, we report on a cryogenic-temperature study of the photoluminescence of single CsPbBr3 nanocrystals in the intermediate quantum confinement regime. We reveal the size-dependence of the spectral features observed: the bright triplet exciton energy splittings, the trion and biexciton binding energies, and the optical phonon replica spectrum. In addition, we show that bright triplet energy splittings are consistent with a pure exchange model and that the variety of polarization properties and spectra recorded can be rationalized simply by considering the orientation of the emitting dipoles and the populations of the emitting states.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.3c00793