Enhancement of photoluminescence of ZnS:Mn nanocrystals by hybridizing with polymerized acrylic acid

M. Konishi, T. Isobe, M. Senna

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

Mn2+-doped ZnS (ZnS:Mn) nanocrystals are hybridized with polymerized acrylic acid. By using either acrylic acid (AA) monomer or poly(acrylic acid) (PAA) polymer as a starting material, differences in optical and chemical properties of hybrid nanocrystals are compared. The enhancement of photoluminescence at 580 nm due to the d-d transition of Mn2+ is larger for ZnS:Mn nanocrystals modified by AA and aged at 80°C for tagehours for polymerization (the sample ZSAA5-tage, 0 ≤ tage ≤ 24), as compared with that modified by PAA (the sample ZSPAA). The C=O groups and ZnS are excited simultaneously by a light of 350 nm to stimulate energy transfer to Mn2+ ions jointly. In the samples ZSAA5-tage, oxygen atoms of carboxyl groups form -S-O-C(=O)- bonds and the valence number of sulfur increases from -2 to +6, as confirmed by infrared absorption and X-ray photoelectron spectra. As a result, electrons of sulfur atoms are pushed toward carboxyl groups to enhance the emissions from both C=O groups and Mn2+ ions. In contrast, the sample ZSPAA exhibits predominant interaction of C=O groups with metallic ions to form -C-O-Me- bonds (Me=Zn2+ and Mn2+). This decrease in the amount of C=O groups reduces energy transfer to Mn2+ ions.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Luminescence
Volume93
Issue number1
DOIs
Publication statusPublished - 2001 May 1

Keywords

  • Acrylic acid
  • Energy transfer
  • Nanocrystals
  • Photoluminescence
  • Polymerized acrylic acid
  • ZnS:Mn

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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