Luminescent properties of Pr3+-sensitized LaPO4:Gd3+ ultraviolet-B phosphor under vacuum-ultraviolet light excitation

DOI PDF 被引用文献10件
  • Shinji Okamoto
    Tokyo Kagaku Kenkyusho Co., Ltd. 1 , 2-2-1 Shimotsuruma, Yamato, Kanagawa 242-0001, Japan
  • Rika Uchino
    Tokyo University of Technology 2 School of Bionics, , 1404-1 Katakura, Hachioji, Tokyo 192-0982, Japan
  • Keisuke Kobayashi
    Tokyo University of Technology 2 School of Bionics, , 1404-1 Katakura, Hachioji, Tokyo 192-0982, Japan
  • Hajime Yamamoto
    Tokyo University of Technology 2 School of Bionics, , 1404-1 Katakura, Hachioji, Tokyo 192-0982, Japan

書誌事項

公開日
2009-07-01
DOI
  • 10.1063/1.3159889
公開者
AIP Publishing

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説明

<jats:p>Luminescent properties of Pr3+-sensitized LaPO4:Gd3+ under vacuum-ultraviolet (vuv) light excitation have been investigated. The energy transfer probably occurs from the 5d levels in Pr3+ ions to Gd3+ ions under 172nm light excitation. LaPO4:Gd3+,Pr3+ shows efficient ultraviolet-B (uv-B) emission at 312nm, whose peak intensity reaches its maximum at Gd=35mol% and Pr=5mol%. (La0.65Gd0.35)0.95Pr0.05PO4 is about 1.6 times higher than a typical uv-B phosphor for vuv lamp, Y0.75Gd0.25Al3(BO3)4, in Gd3+-emission intensity under 172nm light excitation. This result implies that the Pr3+-sensitized LaPO4:Gd3+ is a candidate of uv-B phosphors for xenon-excimer discharge vuv lamps. In order to evaluate the effect of the narrow-band uv-B emission by LaPO4:Gd3+,Pr3+ phosphor, irradiation test on DNA was performed. The irradiation damage of pUC 18 DNA by the narrow-band uv-B light from the LaPO4:Gd3+,Pr3+ phosphor is in the same magnitude as that by uv-A light from a filtered Hg lamp, even though the uv-B lamp is higher than the uv-A lamp in power density and photon energy.</jats:p>

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