Abstract
Two of Eu3+/Tb3+ co-doped amorphous Mg-Al double hydroxide salts, with Eu3+/Tb3+ molar ratios of 1/4 and 4/1, were prepared and their photoluminescence dependence on phase transition has been investigated. Our results revealed that the co-doped amorphous samples exhibited excellent green emissions due to 5D4→7FJ (J=5, 6) transitions of Tb3+ under the excitation of 350, 370 and 380nm, and red emissions due to 5D0→7FJ (J=1, 2) transitions of Eu3+ under the excitation of 395 and 468nm. Moreover, the emission intensity is dependent on the Eu3+/Tb3+ molar ratio. When the amorphous Eu3+/Tb3+ co-doped samples were annealed at 200 and 300°C, the phase transition was unobservable. After the samples were annealed at 500°C, the samples began to transform. Further, the multi-crystalline phases formed after the samples were annealed at 700 and 900°C. Moreover, the emissions attributed to Eu3+ and Tb3+ incorporated in the amorphous host are greatly stronger than that of in the multi-crystalline host. These results indicated the amorphous phase was more favorable for the emissions of Eu3+ and Tb3+ compared with that of the multi-crystalline phases.
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