Presentation 2003/1/20
Effects of Gd Doping on Luminescence Properties of SrIn_2O_4:Pr^<3+>, a Phosphor for Low-energy Electron Excitation
Manabu OGURA, Akira YAMAMOTO,
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Abstract(in English) Some III-group impurities, e.g. Al^<3+>, B^<3+>, Sc^<3+>, Y^<3+> or Gd^<3+>, added to a red phosphor SrIn_2O_4:Pr^<3+> for low-energy electron excitation, improve luminescence efficiency, while another impurity, La3+ decreases efficiency. This work investigates the mechanism of this impurity effect, particularly the difference between Gd^<3+> and La^<3+> in improving efficiency. The sites where these ions replace in SrIn_2O_4 lattice are discussed with powder X-ray diffraction and luminescence spectra measurements. The impurity effect on luminescence efficiency is discussed based on a following model; III-group impurities substituting In^<3+> site improve the luminescence efficiency of Pr^<3+> by capturing electrons in competition with oxygen ion vacancies, which work as nonradiative centers at higher temperature. In contrast III-group impurities substituting Sr^<2+> site decreases efficiency by increasing oxygen ion vacancies.
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Keyword(in English) Low-energy electron phosphors / rare earth impurities / luminescence efficiency / trap levels
Paper # EID20002-90
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Committee EID
Conference Date 2003/1/20(1days)
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Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Effects of Gd Doping on Luminescence Properties of SrIn_2O_4:Pr^<3+>, a Phosphor for Low-energy Electron Excitation
Sub Title (in English)
Keyword(1) Low-energy electron phosphors
Keyword(2) rare earth impurities
Keyword(3) luminescence efficiency
Keyword(4) trap levels
1st Author's Name Manabu OGURA
1st Author's Affiliation Tokyo University of Technology()
2nd Author's Name Akira YAMAMOTO
2nd Author's Affiliation Tokyo University of Technology
Date 2003/1/20
Paper # EID20002-90
Volume (vol) vol.102
Number (no) 600
Page pp.pp.-
#Pages 4
Date of Issue