中文摘要：

对白光发光二极管（light-emitting diode,LED）用Y3Al5O12（YAG）单晶荧光材料的制备和光谱性能进行了研究。采用提拉法生长了白光LED用Ce：YAG及Sm,Ce：YAG晶体,并通过吸收光谱、激发光谱和发射光谱等对晶体的光谱特性进行表征。结果表明：Ce：YAG单晶作为荧光材料被发射波长460 nm左右的蓝光激发,产生1个480～650 nm的宽峰发射。Ce：YAG荧光材料的发光中缺少红光成分,通过Sm3＋,Ce3＋共掺的Sm,Ce：YAG晶体可以有效增加发光中的红色发光成分。

英文摘要：

The growth and spectra characteristics of Ce doped Y3Al5O12（Ce：YAG） and Ce,Sm-codoped YAG（Sm,Ce：YAG） single crystals luminescent materials used for white light-emitting diode（LED） were investigated.The Ce：YAG and Sm,Ce：YAG single crystals were grown by the Czochralski method,and their luminescence properties were analyzed via the absorption,emission and excitation spectra.The results indicate that when Ce：YAG crystal is excitated by 460 nm blue light,a broad emission band of 480–650 nm range is produced in the absence of a red light component.It was found that the red light component of Ce：YAG luminescent ma-terial was of importance to improve the color rendering index,and this could be enhanced by Sm3＋ and Ce3＋ co-doping.The Sm,Ce：YAG crystal is promising to improve the color rendering index of white LED.