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

M. Konishi, Tetsuhiko Isobe, M. Senna

Research output: Contribution to journalArticle

90 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

Fingerprint

acrylic acid
Nanoparticles
Nanocrystals
Photoluminescence
nanocrystals
Ions
photoluminescence
augmentation
carbopol 940
Energy Transfer
carboxyl group
Sulfur
Energy transfer
ions
sulfur
energy transfer
Atoms
Infrared absorption
Photoelectrons
Polymerization

Keywords

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

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Enhancement of photoluminescence of ZnS : Mn nanocrystals by hybridizing with polymerized acrylic acid. / Konishi, M.; Isobe, Tetsuhiko; Senna, M.

In: Journal of Luminescence, Vol. 93, No. 1, 05.2001, p. 1-8.

Research output: Contribution to journalArticle

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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.",
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