Enhanced UV-light emission in ZnO/ZnS quantum dot nanocrystals

Ki Eun Kim, Woong Kim, Yun Mo Sung

Research output: Contribution to journalArticlepeer-review

Abstract

ZnO/ZnS core/shell nanocrystals (∼5-7 nm in diameter) with a size close to the quantum confinement regime were successfully synthesized using polyol and thermolysis. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analyses reveal that they exist in a highly crystalline wurtzite structure. The ZnO/ZnS nanocrystals show significantly enhanced UV-light emission (∼384 nm) due to effective surface passivation of the ZnO core, whereas the emission of green light (∼550 nm) was almost negligible. They also showed slight photoluminescence (PL) red-shift, which is possibly due to further growth of the ZnO core and/or the extension of the electron wave function to the shell. The ZnO/ZnS core/shell nanocrystals demonstrate strong potential for use as low-cost UV-light emitting devices.

Original languageEnglish
Pages (from-to)640-644
Number of pages5
JournalKorean Journal of Materials Research
Volume18
Issue number12
DOIs
Publication statusPublished - 2008

Keywords

  • Nanocrystals
  • Photoluminescence
  • UV-emission
  • ZnO
  • ZnO/ZnS

ASJC Scopus subject areas

  • Materials Science(all)

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