Luminescent Anisotropic Wurtzite InP Nanocrystals

David Stone, Somnath Koley, Sergei Remennik, Lior Asor, Yossef E. Panfil, Tom Naor, Uri Banin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Indium phosphide (InP) nanocrystals are emerging as an alternative to heavy metal containing nanocrystals for optoelectronic applications but lag behind in terms of synthetic control. Herein, luminescent wurtzite InP nanocrystals with narrow size distribution were synthesized via a cation exchange reaction from hexagonal Cu3P nanocrystals. A comprehensive surface treatment with NOBF4 was performed, which removes excess copper while generating stoichiometric In/P nanocrystals with fluoride surface passivation. The attained InP nanocrystals manifest a highly resolved absorption spectrum with a narrow emission line of 80 meV, and photoluminescence quantum yield of up to 40%. Optical anisotropy measurements on ensemble and single particle bases show the occurrence of polarized transitions directly mirroring the anisotropic wurtzite lattice, as also manifested from modeling of the quantum confined electronic levels. This shows a green synthesis path for achieving wurtzite InP nanocrystals with desired optoelectronic properties including color purity and light polarization with potential for diverse optoelectronic applications.

Original languageAmerican English
Pages (from-to)10032-10039
Number of pages8
JournalNano Letters
Volume21
Issue number23
DOIs
StatePublished - 8 Dec 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.

Keywords

  • Wurtzite indium phosphide
  • anisotropic nanocrystals
  • cation exchange
  • light polarization
  • surface trap passivation

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