Enhanced photoluminescence for ZnS nanocrystals doped with Mn2+ close to carboxyl groups and/or S2- vacancies

T. Isobe, T. Igarashi, M. Konishi, M. Senna

Research output: Contribution to journalConference article

18 Citations (Scopus)

Abstract

ZnS nanocrystals doped with Mn2+ ions are prepared by a solution process and subsequent UV irradiation to produce the samples with different S/(Zn+Mn) ratios and/or surface modification by acrylic acids. Coordination states around Mn2+ ions were examined at 9 and 35 GHz by electron paramagnetic resonance spectroscopy. The Mn2+ sites in the vicinity of S2- vacancies or carboxyl groups are observed at the frequencies more than 9 or 35 GHz, respectively, for nanocrystals, but are not for the bulk sample of 250 nm diameter. Such Mn2+ sites enhance the photoluminescence due to d-d transition of Mn2+ ions through energy transfer from S2- vacancies or carboxyl groups, excited simultaneously by a light of 350 nm for exciting ZnS.

Original languageEnglish
Pages (from-to)383-388
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume536
Publication statusPublished - 1999 Jan 1
EventProceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' - Boston, MA, USA
Duration: 1998 Nov 301998 Dec 3

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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