Synthesis of LiGaO2 nanocrystals and their application toward bright UV emission from ZnO quantum dots

Takahisa Omata, Atsushi Tazuke, Katsuhiro Nose, Shinya Otsuka-Yao-Matsuo

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Inorganic capping material for ZnO quantum dots (QDs) was designed on the basis of the crystal and electronic structures, and a ternary β-LiGaO 2 was proposed as a candidate. Two reaction routes to the β-LiGaO2 nanocrystals (NCs), the alkylhalide elimination reaction between gallium iso-propoxide and lithium bromide and the thermolysis of gallium and lithium acetylacetonates, were investigated. The alkylhalide elimination reaction resulted in near-stoichiometric β-LiGaO2 NCs; however, it was not applicable to fabricate composite NCs with ZnO, because ZnO dissolved in the β-LiGaO2 reaction solution upon heating. Based on the thermolysis formation of β-LiGaO2, composite NCs of ZnO with β-LiGaO2 were successfully obtained. The high resolution transmission electron microscopy and X-ray photoelectron spectroscopy results indicated that the composite was a ZnO/LiGaO2 core/shell nanostructure consisting of ∼3.5 nm diameter core ZnO and ∼0.5 nm thick β-LiGaO2 shell layers. Because the photoluminescence of the core/shell QDs was dominated by the core ZnO, the type-I quantum well structure of the core/shell QDs, in which the core ZnO part forms the potential well, was strongly suggested.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalJournal of Crystal Growth
Volume330
Issue number1
DOIs
Publication statusPublished - 2011 Sep 1
Externally publishedYes

Keywords

  • A1. Nanostructures
  • A1. Quantum dots
  • B1. Nanomaterials
  • B1. Zinc oxide
  • B2. Phosphors
  • B2. Semiconducting ternary compounds

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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