掺Fe铝酸锂晶体的光谱性能研究  

Spectroscopic Study of Iron Doped LiAlO_2 Single Crystal

作　　者：滕浩[1,2] 周圣明[1] 林辉[1,2] 贾婷婷[1,2] 侯肖瑞[1,2] 王军[1] 

机构地区：[1]中国科学院上海光学精密机械研究所强激光材料科学与技术重点实验室,上海201800 [2]中国科学院研究生院,北京100049

出　　处：《光学学报》2010年第8期2333-2337,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60676004)资助课题

摘　　要：采用提拉法生长了质量较高的掺Fe铝酸锂(LiAlO2:Fe)晶体,并用吸收光谱、光致激发与发射光谱以及X射线激发发射(XEL)光谱测试等方法对晶体的光谱性质及结构进行了研究。结果表明,晶体对可见光与近红外光具有较高的透过,而在深紫外波段存在与Fe离子相关的吸收。以266nm光激发得到710nm的Fe3+离子的特征发射峰,分析表明晶体中Fe3+离子代替Li+离子而处于8面体格位。比较不同晶体样品的XEL光谱发现,空气退火后的γ-LiAlO2晶体出现了318nm处较强的缺陷发光,而同样条件退火后的LiAlO2:Fe晶体与未退火的γ-LiAlO2晶体均未观察到相应的发光。分析得出此发光应与晶体退火后形成的F+心有关,而Fe掺杂可抑制晶体中Li2O的挥发,提高晶体的热稳定性。A novel LiAlO2：Fe single crystal with good quality was grown by Czochralski method.The spectroscopic characteristics and structure of the crystal were studied by absorption spectrum,photoexcitation and emission spectra,and X-ray excited luminescence（XEL）spectra.The results show that the crystal is transparent in the visible-infrared range,while has absorption band related to the Fe doping in deep ultraviolet range,and the crystal shows the 710 nm typical Fe3＋ peak when it is exited by 266 nm light.For the similarity of excitation and emission spectra to LiAlO2：Fe phosphor,the Fe3＋ ions occupied the octahedral sites of Li＋ in γ-LiAlO2 crystal.The XEL spectra show a strong emission band peaked at 318 nm for γ-LiAlO2 cryatal.It was concluded that the emission band at 318 nm should be related to F＋ centers resulted from the loss of Li2O,whereas the Fe doping could restrain the evaporation of Li2O and improve the thermal stability of γ-LiAlO2 crystal.

关 键 词：光学材料 衬底 LiAlO2:Fe晶体 提拉法 光谱 X射线激发发射 

分 类 号：O73[理学—晶体学]