Halide exchange and surface modification of metal halide perovskite nanocrystals with alkyltrichlorosilanes

Md Aslam Uddin, Rosemary L. Calabro, Doo Young Kim, Kenneth R. Graham

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Metal halide perovskite nanocrystals have recently emerged as promising materials for light emitting displays and lasing applications due to their narrow emission wavelengths, high photoluminescence quantum yields, and readily adjustable emission wavelengths. For these metal halide perovskite nanocrystals to be useful in commercial applications, their stability must be increased and the photoluminescence quantum yields of the iodide (red emitting) and chloride (blue emitting) containing derivatives must also be increased. The photoluminescence quantum yields of blue emitting CsPbCl3 nanoparticles lag behind those of green emitting CsPbBr3 nanoparticles, with maximum photoluminescence quantum yields of 1-10% previously reported for CsPbCl3 as compared to 80-100% for CsPbBr3. Herein, we show that alkyltrichlorosilanes (R-SiCl3) can be used as Cl-sources for rapid anion exchange with host CsPbBr3 nanocrystals. This anion exchange reaction is advantageous in that it can be performed at room temperature and results in highly dispersible nanoparticles coated with siloxane shells. CsPbCl3 nanoparticles produced through Cl-exchange with R-SiCl3 show significantly improved long-term stability and high photoluminescence quantum yields of up to 12%. These siloxane coated nanocrystals are even stable in the presence of water, whereas CsPbCl3 nanoparticles synthesized through other routes rapidly degrade in the presence of water.

Original languageEnglish
Pages (from-to)16919-16927
Number of pages9
JournalNanoscale
Volume10
Issue number35
DOIs
StatePublished - Sep 21 2018

Bibliographical note

Funding Information:
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences and the EPSCoR program, under Award Number DE-SC0018208. The TCSPC instrument was purchased by the support from the University of Kentucky, Vice President of Research Equipment grant.

Publisher Copyright:
© The Royal Society of Chemistry 2018.

ASJC Scopus subject areas

  • Materials Science (all)

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