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Issue:
Growth technique of optical quality large-size single-crystal sapphire
Author(s):
Wang Dongyang
,
He Wei
,
Li Ling
,
Zhai Jianpang
Pages:
350
-
356
Year:
2015
Issue:
4
Journal:
Journal of Shenzhen University(Science & Engineering)
Keyword:
crystallography
;
sapphire crystal
;
Kyropoulos method
;
crystal growth
;
LED substrate
;
crystal defects
;
Abstract:
分析了泡生法生长大尺寸、光学质量蓝宝石单晶工艺,探讨了影响蓝宝石晶体生长的9大因素:①温场的轴向和径向温度梯度大小对晶体生长的影响;②氧化锆层对晶体质量的影响;③原料对晶体生长的影响;④籽晶的质量和晶向对晶体生长的影响;⑤引晶对晶体中残余应力、位错和晶界的影响;⑥放肩角度对晶体的影响;⑦等径生长速度对晶体的影响;⑧收尾拉脱与否对晶体质量的影响;⑨退火时间长短对晶体的影响.通过分析各影响因素,改进生长工艺,成功生长出70 kg蓝宝石单晶.对其进行表征发现,在晶体气泡、晶体方向和应力等方面均达到发光二极管芯片衬底要求.
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