中文摘要：

以Y2O3-A l2O3-S iO2-L i2O-K2O-Na2O玻璃作为Ce,Sm掺杂基质玻璃,制备出白光LED用YAG：Ce和YAG：Ce,Sm微晶玻璃。利用X射线衍射、荧光光度计对微晶玻璃的晶相、光谱性能及荧光寿命进行了研究。结果表明：掺杂铈或铈钐共掺杂基质玻璃在1400℃热处理得到的几乎是纯YAG晶相;并且YAG：Ce和YAG：Ce,Sm微晶玻璃在454 nm有特征激发峰,说明它们能被蓝光芯片有效激发;在蓝光芯片激发下,YAG：Ce微晶玻璃在480~700 nm产生有效发射,发射光谱中心波长531 nm,同时铈钐共掺微晶玻璃在566,602,615,650 nm都有窄的发射峰,可以提高LED s的显色性、降低色温;此外,浓度掺杂实验表明钐的较好掺杂浓度范围是Ce：Sm为10∶2~10∶10;YAG：Ce和YAG：Ce,Sm微晶玻璃的荧光衰减曲线表明,YAG：Ce微晶玻璃的荧光寿命要长于YAG：Ce,Sm微晶玻璃。

英文摘要：

The YAG：Ce and YAG：Ce,Sm glass ceramics for white-LED were prepared by means of heating treatment of the glass matrix by using Y2O3-Al2O3-SiO2-Li2O-K2O-Na2O as Ce,Sm co-doped glass matrix.The crystalline phase structure,luminescence properties and lifetime were examined by X-ray diffraction（XRD） and photoluminescence spectroscopy.The XRD analysis showed that almost pure YAG phase was obtained as the heat-treated temperature was 1400 ℃.The characteristic excitation peak located at 454 nm was observed in the excitation spectra of the YAG：Ce or YAG：Ce,Sm glass ceramic,which indicated that the glass ceramic could be effectively excited by blue light chip.A broad emission band center located at 531 nm was observed from 480 to 700 nm using blue light chip excitation.Meanwhile,there were four small emission peaks located at 566,602,615 and 650 nm in YAG：Ce,Sm glass ceramic,which could improve the color rendering index and decrease the color temperature of LEDs.Furthermore,different Ce,Sm co-doped experiments showed that the better co-doped ratio of Ce： Sm would be in the range of 10∶ 2 to 10∶ 10.The decay curves of the fluorescence of glass-ceramics test showed that the lifetime of YAG：Ce glass ceramics was longer than YAG：Ce,Sm glass ceramics.