Intense Dark Exciton Emission from Strongly Quantum-Confined CsPbBr3Nanocrystals

Daniel Rossi, Xiaohan Liu, Yangjin Lee, Mohit Khurana, Joseph Puthenpurayil, Kwanpyo Kim, Alexey V. Akimov, Jinwoo Cheon, Dong Hee Son

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


Dark exciton as the lowest-energy (ground) exciton state in metal halide perovskite nanocrystals is a subject of much interest. This is because the superior performance of perovskites as the photon source combined with long lifetime of dark exciton can be attractive for many applications of exciton. However, the direct observation of the intense and long-lived dark exciton emission, indicating facile access to dark ground exciton state, has remained elusive. Here, we report the intense photoluminescence from dark exciton with microsecond lifetime in strongly confined CsPbBr3 nanocrystals and reveal the crucial role of confinement in accessing the dark ground exciton state. This study establishes the potential of strongly quantum-confined perovskite nanostructures as the excellent platform to harvest the benefits of extremely long-lived dark exciton.

Original languageEnglish
Pages (from-to)7321-7326
Number of pages6
JournalNano letters
Issue number10
Publication statusPublished - 2020 Oct 14

Bibliographical note

Funding Information:
D.H.S. and A.A. acknowledge the National Science Foundation (CHE-1836538) and X-grants from Texas A&M University for financial support. J.C. acknowledges Institute for Basic Science (IBS-R026-D1) for financial support.

Publisher Copyright:
Copyright © 2020 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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