Tunable photoluminescence wavelength of chalcopyrite CuInS 2-based semiconductor nanocrystals synthesized in a colloidal system

Hiroyuki Nakamura, Wataru Kato, Masato Uehara, Katsuhiro Nose, Takahisa Omata, Shinya Otsuka-Yao-Matsuo, Masaya Miyazaki, Hideaki Maeda

Research output: Contribution to journalArticlepeer-review

262 Citations (Scopus)

Abstract

Chalcopyrite-type CuInS2-based alloyed fluorescent nanocrystals (NCs), which contain no regulated heavy metal ions, were synthesized by heating an organometallic solution to demonstrate optical property tunability. Introduction of Zn into the CuInS2 system enhanced their photoluminescence (PL) intensity. The resultant particles were 3-6 nm; they varied with experimental conditions and were discrete and colloidally stable. The band-gap energy and PL wavelength of Zn-Cu-In-S (ZCIS) NCs varied with Zn content and particle size. Their PL was controllable within 570-800 nm by altering the band-gap energy. Furthermore, indium substitution with gallium was shown to control band-gap energy toward ∼3.1 eV, 500 nm of PL wavelength. In addition, ZnS coating of this nanocrystal can approximately double the PL strength. Finally, surface treatment with mercaptoundecanoic acid dispersed hydrophilic ZCIS NCs into water.

Original languageEnglish
Pages (from-to)3330-3335
Number of pages6
JournalChemistry of Materials
Volume18
Issue number14
DOIs
Publication statusPublished - 2006 Jul 11
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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