Eu 도핑 SrAl2O4 형광체의 광 여기 전류 특성에 대한 Dy 코-도핑 효과
Dy co-doping effect on photo-induced current properties of Eu-doped SrAl2O4 phosphor
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Eu2+-doped SrAl2O4 and Eu2+Eu, Dy3+ co-doped SrAl2O4 phosphors have been synthesized by conventional solid state method. Photocurrent properties of Eu2+ doped SrAl2O4 and Eu2+, Dy3+ co-doped SrAl2O4 phosphors, in order to elucidate Dy3+ co-doping effect, during and after ceasing ultraviolet-ray (UV) irradiation have been investigated. The photocurrent of Eu2+, Dy3+ co-doped SrAl2O4 phosphors during UV irradiation was 4-times lower than that of Eu2+-doped SrAl2O4 during UV irradiation, and 7-times higher than that of Eu2+-doped SrAl2O4 after ceasing UV irradiation. The photocurrent results indicated that holes of charge carriers captured in hole trapping center during the UV irradiation and liberated after- glow process, and made clear that Dy3+ of co-dopant acted as a hole trap. The photocurrent of SrAl2O4 showed a good proportional relationship to UV intensity in the range of 1~ 5 mW/㎠, and Eu2+-doped SrAl2O4 was confirmed to be a possible UV sensor.
Abstract
Eu2+-doped SrAl2O4 and Eu2+Eu, Dy3+ co-doped SrAl2O4 phosphors have been synthesized by conventional solid state method. Photocurrent properties of Eu2+ doped SrAl2O4 and Eu2+, Dy3+ co-doped SrAl2O4 phosphors, in order to elucidate Dy3+ co-doping effect, during and after ceasing ultraviolet-ray (UV) irradiation have been investigated. The photocurrent of Eu2+, Dy3+ co-doped SrAl2O4 phosphors during UV irradiation was 4-times lower than that of Eu2+-doped SrAl2O4 during UV irradiation, and 7-times higher than that of Eu2+-doped SrAl2O4 after ceasing UV irradiation. The photocurrent results indicated that holes of charge carriers captured in hole trapping center during the UV irradiation and liberated after- glow process, and made clear that Dy3+ of co-dopant acted as a hole trap. The photocurrent of SrAl2O4 showed a good proportional relationship to UV intensity in the range of 1~ 5 mW/㎠, and Eu2+-doped SrAl2O4 was confirmed to be a possible UV sensor.
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