中文摘要：

采用坩埚下降法成功生长出共掺Dy^3＋和Ge^4＋的硅酸铋（BSO）单晶，其中Dy^3＋和Ge^4＋的摩尔分数分别为1％和3％，其直径为2．54cm（1in），长度达8cm，外观无色透明，无包裹物和裂纹等缺陷，表明共掺入Dy^3＋和Ge^4＋能够有效改善BSO晶体的偏析现象；双摇摆曲线半峰全宽为24＂表明晶体具有较高的结晶质量．Dy：BGSO晶体的荧光光谱包含Bp和Dy^3＋的特征峰，Bi抖吸收的能量能够传递给Dy^3＋.色坐标和色谱计算结果表明，其在多种波长的紫外光激发下均可以发射暖白光．该晶体在365nm紫外光灯辐照下的实际发光效果说明，其能够高效率、360。全方位立体发射肉眼可见的明亮暖白光．故Dy：BGSO单晶是一种可用于大功率LED器件的候选荧光单晶材料．

英文摘要：

Dy^3＋ and Ge^4＋ co-doped Bi4 Si3O12 single crystal was successfully grown by Bridgman method, in which the mole fractions of Dy^3＋ and Ge^4＋ were 1% and 3%, respectively. The crystal with 2.54 cm （1 in） in diameter and 8 cm in length is transparent, colorless, and without wrappages and cracks. The result shows that co-doped Dy^3＋ and Ge^4＋ could obviously reduce the segregation phenomenon. The full width at half maximum of rocking curve is about 24＂, which indicates the crystal possesses high crystalline quality. The fluorescence spectra of Dy： BGSO crystal include characteristic peak spectra of Bi^3＋ and Dy^3＋ , and the energy absorbed by Bi^3＋ could be transfer to Dy^3＋. The calculated results of CIE coordinates and color temperature show that the crystal could emit warm white light when it is excited by various ultraviolet light. Meanwhile, the actual luminous effect of Dy：BGSO crystal under 365 nm excitation light also show that the crystal can realize 360° emitted macroscopic bright warm light with high efficiency. Thus Dy： BGSO single crystal is a alternative fluorescent single crystal material for developing high-power warm white LED devices.