Er^(3+):LiYF_4单晶生长与光谱特性  

Growth and Spectral Properties of Er^(3+):LiYF_4 Single Crystal

作　　者：於杏燕[1] 陈红兵[2] 王苏静[2] 周燕飞[3] 武安华[3] 戴世勋[1] 

机构地区：[1]宁波大学信息科学与工程学院,宁波315211 [2]宁波大学材料科学与化学工程学院,宁波315211 [3]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2011年第9期923-928,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(61078056;60878042);浙江省杰出青年基金(R1101263);宁波市新型光电功能材料及器件创新团队项目(2009B21007);宁波大学王宽诚幸福基金~~

摘　　要：采用坩埚下降法在非真空密闭条件下生长出尺寸为φ9mm×68mm的1mol%Er3+:LiYF4单晶材料,测试了样品的折射率、透过光谱、吸收光谱、以及在980nm和792nm激光泵浦下的近红外和中红外荧光光谱.应用Judd-Ofelt理论计算了Er3+离子在LiYF4晶体材料中的强度参数(Ωt,t=2,4,6)、能级跃迁振子强度(fcal)、自发辐射跃迁几率(A)、荧光分支比(β)、辐射寿命(τrad)等光谱参数,讨论了其近红外和中红外的荧光特性.结果表明,在980nm和792nm激光泵浦下观察到了1.5μm近红外荧光和3.0μm中红外荧光,分别对应于Er3+:4I13/2→4I15/2和4I11/2→4I13/2跃迁,并分析了3.0μm中红外荧光强度较弱的可能原因.Er3＋：LiYF4 single crystal was grown by the Bridgman method under non-vacuum atmosphere.The single crystal was in size of φ9mm×68mm with 1mol% concentration of Er3＋ ions.Optical properties of the single crystal in-cluding the refractive index,UV and IR transmission spectra,absorption spectrum,near-infrared emission spectrum under 980nm excitation and mid-infrared emission spectrum under 792nm excitation were measured.The intensity parameters（Ωt,t=2,4,6）,oscillator strength（fcal）,transition probabilities（A）,branching ratios（β） and radiation lifetimes（τrad） of Er3＋ ions in the LiYF4 were estimated by using the Judd-Ofelt theory.The near-and mid-infrared fluorescence properties of the sample were discussed.The results indicate that near infrared fluorescence at 1.5μm corresponding to the Er3＋：4I13/2→4I15/2 transition is observed under 980nm excitation while mid-infrared fluorescence at 3.0μm corre-sponding to the Er3＋：4I11/2→4I13/2 transition is detected under 792 nm excitation.The reason that caused the weakening of fluorescence at 3.0μm is analyzed.

关 键 词：Er3+:LiYF4单晶 中红外发光 吸收谱 光学参数 

分 类 号：TQ174[化学工程—陶瓷工业] O482[化学工程—硅酸盐工业]