We have developed bright persistent phosphors of Ce3+-Cr3+-doped Y3Al5-xGaxO12 (x = 2.5, 3, 3.5) ceramics with green luminescence (Ce3+:5d→4f) via blue-light excitation. The persistent luminance value 5 min after ceasing blue-light excitation for the Ce3+-Cr3+-doped Y3Al2Ga3O12 sample is approximately 3900 times higher than that for a Ce3+-doped Y3Al2Ga3O12 sample and better than that from compact SrAl2O4:Eu2+-Dy3+ powders. The results are consequences of efficient carrier trap formation and effective excitation of the interior of the translucent ceramic samples. A series of Ce3+-Cr3+-doped garnet materials is the best candidate for the persistent phosphor under white-light emitting diode (LED) illumination consisting of blue LEDs and visible phosphors.
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Ueda et al. (2014) studied this question.
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