Jump to main content
Jump to site search


Photoluminescence signatures of thermal expansion, electron–phonon coupling and phase transitions in cesium lead bromide perovskite nanosheets

Author affiliations

Abstract

In this article, photoluminescence (PL) behaviors of inorganic cesium lead bromide (CsPbBr3) nanosheets are investigated in a broad temperature range from 5 to 500 K. As can be seen from the temperature evolution of the PL peak position, the bandgap blueshift induced by thermal lattice expansion is found to be gradually compensated by the bandgap redshift caused by electron–phonon coupling for the temperature variation from 5 K to 360 K. As the temperature is further increased, the nearly completely compensated PL peak position turns to exhibit a rapid blueshift, again at ∼360 K. Such turning behavior is consistent with an orthorhombic–tetragonal (γ–β) phase transition at this critical temperature. For the PL linewidth, it shows a continuous broadening at temperatures beyond 40 K, suggesting the dominant role of phonon scattering, especially at high temperatures. These findings of temperature dependent photophysical properties of CsPbBr3 nanosheets may provide useful information of their further applications in the emerging nano photo-electronic devices.

Graphical abstract: Photoluminescence signatures of thermal expansion, electron–phonon coupling and phase transitions in cesium lead bromide perovskite nanosheets

Back to tab navigation

Article information


Submitted
02 Jan 2020
Accepted
24 Feb 2020
First published
25 Feb 2020

Nanoscale, 2020, Advance Article
Article type
Paper

Photoluminescence signatures of thermal expansion, electron–phonon coupling and phase transitions in cesium lead bromide perovskite nanosheets

X. Lao, W. Zhou, Y. Bao, X. Wang, Z. Yang, M. Wang and S. Xu, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR00025F

Social activity

Search articles by author

Spotlight

Advertisements