Yb:Er:Tm:LiTaO_3的上转换发白光性能研究  

Tm∶Yb∶Er∶LiTaO_3 Upconversion Properties of White Light

作　　者：石连升[1] 温猛[1] 钱艳楠[2] 王锐[2] 郝铭[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150080 [2]哈尔滨工业大学化学系,黑龙江哈尔滨150001

出　　处：《中国稀土学报》2011年第1期78-81,共4页Journal of the Chinese Society of Rare Earths

基　　金：黑龙江省自然科学基金(B200903)资助

摘　　要：980 nm脉冲激光激发下,首次通过高温固相法制备Yb(10%)∶Er(1%)∶Tm(1%)∶LiTaO3(摩尔分数)多晶粉并实现室温上转换白光。X射线粉末衍射测试结果表明,Yb∶Er∶Tm∶LiTaO3中的掺杂离子并没有改变晶格结构,以取代的方式存在于钽酸锂晶格中。结合功率曲线测试结果和上转换机制研究发现,产生上转换蓝光的Tm3+离子1G4态的布居主要来自双光子同时吸收过程。而单光子上转换输出的红光,则由Tm3+和Er3+离子之间的交叉弛豫过程产生,即3F2/3(Tm3+)+4I15/2(Er3+)→3H6(Tm3+)+4I9/2(Er3+)。上转换绿光来源于Yb/Er离子对的二次能量传递。The room temperature bright white upconversion（UC） luminescence in Yb3＋/Er3＋/Tm3＋-tridoped LiTaO3 polycrystal,which was prepare by high temperature solid state method,was obtained under single-wavelength diode laser excitation of 980 nm.X-ray diffraction indicated that the crystal structure of LiTaO3 was not changed by doping with the trivalent ions（Yb3＋,Er3＋ and Tm3＋）.Combined with the pump power dependence analysis and the UC mechanisms,it was found that the blue upconversion emission came from the population of the 1G4 state of Tm3＋ ions by absorbing two photons simultaneously,and the red upconversion emission was contributed from the cross relaxation（CR） between Tm3＋ and Er3＋ ions： 3F2/3（Tm3＋）＋4I15/2（Er3＋）→3H6（Tm3＋）＋4I9/2（Er3＋）.The green upconversion emission resulted from the twice energy transition between the Yb/Er ion pair.

关 键 词：高温固相法 上转换白光 Yb:Er:Tm:LiTaO3 跃迁机制 稀土 

分 类 号：O734[理学—晶体学]