【摘 要】
：
采用提拉法生长了Mn:YAG和Ce,Mn:YAG单晶,详细研究了Ce,Mn掺杂浓度对光学性质的影响,优化了Ce,Mn掺杂浓度,并与蓝光芯片组合进行了白光LED光源性能的研究,通过XRD、吸收光谱、荧光光谱对Mn:YAG和Ce,Mn:YAG单晶的晶相、光学特性进行了详细研究,采用电子顺磁共振谱(EPR)对样品内部掺杂离子的价态及配位结构进行了分析,利用LED快速光谱辐射计对所封装的LED光源的光电参
【机 构】
：
温州大学化学与材料工程学院,温州 325035 九州産業大学 工学部 電気情報工学科,福岡 813
论文部分内容阅读
采用提拉法生长了Mn:YAG和Ce,Mn:YAG单晶,详细研究了Ce,Mn掺杂浓度对光学性质的影响,优化了Ce,Mn掺杂浓度,并与蓝光芯片组合进行了白光LED光源性能的研究,通过XRD、吸收光谱、荧光光谱对Mn:YAG和Ce,Mn:YAG单晶的晶相、光学特性进行了详细研究,采用电子顺磁共振谱(EPR)对样品内部掺杂离子的价态及配位结构进行了分析,利用LED快速光谱辐射计对所封装的LED光源的光电参数(色坐标、光效、显色指数等)特性进行了分析,结果表明采用提拉法生长的Mn:YAG和Ce,Mn:YAG单晶的主晶相为YAG单晶相,YAG晶相结构并未发生改变;Mn:YAG和Ce,Mn:YAG样品均表现出了Mn2+离子的特征谱的超精细结构,证明在YAG晶体中Mn离子主要以+2价存在,在460nm的蓝光激发下,Ce,Mn:YAG发光光谱中除了有中心波长为530nm的Ce3+离子发光峰,还有560-590nm的Mn2+离子宽发光带,Mn离子的掺入使光谱中红光发光强度增加,增加了发光中心,扩大了半高峰宽,使发射光谱产生红移,白光LED显色指数提高;并且Mn掺杂的Ce:YAG单晶可以使LED发光更容易保持在白光范围内,在60mA测试电流下光效93.921lm/W、色坐标(0.3103,0.3271)、色温6654K、显色指数为72.1,满足白光LED的照明要求.
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