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Amorphous phosphor 1.4Y2O3·2.5Al2O3·0.1Tb2O3 (the same composition as Y2.8Tb0.2Al5O12) was prepared via a sol-gel method at relatively low temperature (i.e., below 650 °C), which is much lower than that for the preparation of polycrystalline Y3Al5O12:Tb3+ (above 1400 °C). The amorphous phosphor prepared in the optimized conditions showed a bright green-yellowish luminescence, the intensity of which was comparable with that of polycrystalline sample and the emissions of which were assigned to 5D4 → 7Fj transitions of Tb3+. Besides the emissions of Tb3+, the amorphous samples prepared at temperatures below 500 °C presented a weak blue emission band around 420 nm.
The same composition as Y2.8Tb0.2Al5O12 was prepared via a sol-gel method at relatively low temperature (ie, below 650 ° C), which is much lower than that for the the Preparation of polycrystalline Y3Al5O12: Tb3 + (above 1400 ° C). The amorphous phosphor prepared in the optimized conditions showed a bright green-yellowish luminescence, the intensity of which was comparable with that of polycrystalline sample and the emissions of which were assigned to 5D4 → 7Fj transitions of Tb3 +. Besides the emissions of Tb3 +, the amorphous samples prepared at temperatures below 500 ° C presented a weak blue emission band around 420 nm.