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

L. Tsybeskov, M. Alam, S. B. Hafiz, D. K. Ko, A. M. Bratkovsky, X. Wu, D. J. Lockwood

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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.

Original languageEnglish (US)
Article number134301
JournalJournal of Applied Physics
Volume128
Issue number13
DOIs
StatePublished - Oct 7 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Photoluminescence in PbS nanocrystal thin films: Nanocrystal density, film morphology and energy transfer'. Together they form a unique fingerprint.

Cite this