Abstract
-doped and , co-doped phosphors have been synthesized by conventional solid state method. Photocurrent properties of doped and , co-doped phosphors, in order to elucidate co-doping effect, during and after ceasing ultraviolet-ray (UV) irradiation have been investigated. The photocurrent of , co-doped phosphors during UV irradiation was 4-times lower than that of -doped during UV irradiation, and 7-times higher than that of -doped 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 of co-dopant acted as a hole trap. The photocurrent of showed a good proportional relationship to UV intensity in the range of , and -doped was confirmed to be a possible UV sensor.
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