Co2+:BeAl2O4晶体的提拉法生长及光谱特性

人工晶体学报, 2006, 35(4): 854-857. doi: 10.3969/j.issn.1000-985X.2006.04.040

Co2+:BeAl2O4晶体的提拉法生长及光谱特性

夏海平 ^1, , 张新民 ^2, , 张约品 ^3, , 章践立 ^4, , 王金浩 ^5,

1.宁波大学光电子功能材料重点实验室,宁波,315211

2.宁波大学光电子功能材料重点实验室,宁波,315211

3.宁波大学光电子功能材料重点实验室,宁波,315211

4.宁波大学光电子功能材料重点实验室,宁波,315211

5.宁波大学光电子功能材料重点实验室,宁波,315211

基金项目: 国家重点实验室基金(2006076)

关键词：铝酸铍晶体 , 提拉法 , Co2+离子 , 光谱

Growth of Co2+:BeAl2O4 Crystal by Czochralski Method and Their Spectroscopy

应用提拉法,采用合适的化学组分配比和化料过程、以及选用适宜的固液界面温度梯度与生长速度等优化工艺条件,成功地生长出了初始Co2+离子掺杂浓度为0.15mol%、尺寸φ48×85mm2的优质Co2+:BeAl2O4晶体.测定了晶体的吸收光谱,观测到496与 640nm二个主要吸收带,它们分别归属于八面体配位中Co2+的T1(4F)→4T1(4P)跃迁与四面体配位中Co2+的A2(4F)→4T1(4P)跃迁.从晶体的吸收光谱与呈现的粉红色颜色特征可推断大多数的Co2+离子取代BeAl2O4晶体中的Al3+,形成Co2+离子的八面体格位.研究了不同光波长激发下,晶体在可见光波段的荧光特征,观测到678nm波段的荧光发射,这归属于四面体格位中Co2+的电子从4T1(4P)到4A2(4F) 能级的跃迁.

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