采用高温固相法制备了Sr0.96Al2O4∶Eu0.02,Dy0.02,B0.08长余辉发光材料.研究了两步退火工艺中第二次退火温度对其晶体结构、激发光谱、发光光谱、余辉衰减特性、拉曼光谱和热释光光谱的影响.结果表明,随着第二次退火温度的升高,DySr陷阱中的电子浓度逐渐增加,发光动力学级次逐渐增大,这有利于提高长余辉特性;样品的拉曼光谱峰值随退火温度的变化与VO··浓度随退火温度的变化一致,这一点验证了长余辉发光材料的电子陷阱模型的有效性.在余辉测试时间内,第二次退火为1400℃×6 h的样品具有最大的余辉亮度,这源于它具有最大的DySr·陷阱中的电子浓度以及适中的时间衰减常数.
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