Er^(3+)掺杂量对Er^(3+):BaY_2F_8晶体上转换发光性能的影响  

Influence of Er^(3+)-Doping Amount on Up-Conversion Luminescence Properties of Er^(3+):BaY_2F_8 Crystal

作　　者：张守超[1] 阮永丰[2] 王帅[2] 王友发[2] 吴周礼[2] 

机构地区：[1]天津城市建设学院,天津300384 [2]天津大学理学院,天津300072

出　　处：《硅酸盐学报》2011年第11期1877-1881,共5页Journal of The Chinese Ceramic Society

基　　金：天津市自然科学基金(09JCYBJ04100)资助项目

摘　　要：利用温度梯度法生长了Er3+:BaY2F8晶体。测量了样品的吸收谱、上转换荧光发射谱和上转换发光强度与激光泵浦功率的对数关系;分析了Er3+的上转换可见发光机制和Er3+掺量对Er3+:BaY2F8晶体发光强度的影响。结果表明,在相同泵浦功率的980 nm光激发下的Er3+:BaY2F8晶体的上转换发射谱中,552 nm绿光和653 nm红光的发光峰的强度随着Er3+掺量的增加而增大;Er3+掺量小于3.0%(摩尔分数,下同)的晶体,552 nm绿光的上转换发光占主要部分;Er3+掺杂量大于3.0%的晶体,653 nm红色光上转换发光占主要部分。552 nm绿光和653 nm红光发射皆为双光子过程。利用双光子吸收、激发态吸收、能量转移、交叉弛豫和多声子无辐射跃迁等过程解释了这一现象。The Er^3＋：BaY2F8 crystal was grown by a temperature gradient method.The absorption spectra and up-conversion fluorescence emission spectra and up-conversion luminescence intensity versus laser pump power of the Er^3＋：BaY2F8 crystal was measured.The up-conversion visible luminescence mechanism of Er^3＋ ion and the effect of Er^3＋-doped amount on the luminous intensity of the Er3＋：BaY2F8 crystal were investigated.The results show that the intensities of green（552 nm） and red（653 nm） up-conversion emission peaks were increased with Er^3＋ content increasing in the up-conversion emission spectra of the Er^3＋：BaY2F8 crystal excited by 980 nm laser with the same pump power.The green emission was dominant at Er^3＋ content of 〈3.0% in mole,and the red emission prevailed at Er^3＋ content of 〉3.0% in mole.The green and red emissions were due to the two-photon absorption process.The simultaneous green and red emissions and the change of relative intensities could be explained via the two-photon absorption,excited state absorption,energy transfer,cross-relaxation and multi-phonon radiation processes

关 键 词：氟化钇钡 上转换发光 铒 温度梯度法 激光晶体 

分 类 号：TN244[电子电信—物理电子学]