Photoluminescence in PbS nanocrystal thin films: Nanocrystal density, film morphology and energy transfer

Document Type

Article

Publication Date

10-7-2020

Abstract

We show that photoluminescence properties of PbS nanocrystal thin films are directly related to film morphology and nanocrystal density. In densely packed PbS nanocrystal films, low-temperature donor-to-acceptor energy transfer is mainly responsible for the photoluminescence spectra narrowing and shift toward longer wavelengths. At elevated temperatures, back energy transfer is proposed to be responsible for an unusual photoluminescence intensity temperature dependence. In thin films with a low PbS nanocrystal density, the energy transfer is suppressed, and the effect is dramatically reduced.

Identifier

85094161663 (Scopus)

Publication Title

Journal of Applied Physics

External Full Text Location

https://doi.org/10.1063/5.0022549

e-ISSN

10897550

ISSN

00218979

Issue

13

Volume

128

Grant

ECCS-1809112

Fund Ref

Semiconductor Research Corporation

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