发光学报2018，Vol.39Issue(4)：449-456,8.DOI:10.3788/fgxb20183904.0449
YNbO4:Tm3+/Yb3+上转换发光特性研究
Up-conversion Luminescent Properties of YNbO4:Tm3+/Yb3+
摘要
Abstract
Tm3+/Yb3+ droped YNbO4 power sample was prepared with the molar ratios of 50Nb2O5-(46 -x)Y2O3-4Yb2O3-xTm2O3(x =0.1, 0.2, 0.5, 1, 2) by the high temperature solid state method at 1300 ℃. Under 980 nm laser excitation,the upconversion luminescence spectra of sam-ples show 478 nm from 1G4→3H6 transition of Tm3+ ions,645 nm attributed to 1G4→3F4 transition of Tm3+ ions,respectively,and 707 nm emissions assigned to 3F3→3H6 transition of Tm3+ions. The transition process is estimated by using the relation between the upconversion power and the operat-ing current of the 980 nm laser. The numbers of photons absorbed are 2.72,2.69 and 2.01. The first two correspond to three-photon absorption processes,and the last one corresponds to two-photon absorption process. The spectral properties of the samples are studied by using Judd-Ofelt theory. Spectral strength parameters Ωt(t=2,4,6) were computed based on the absorption peak's area of the absorption spectrum. The theoretical oscillator strength and the experimental oscillator strength were calculated according to the spectrum strength parameters,and the root mean square deviation (δrms) was 1.299 ×10 -7. The transition probability, branching ratio and other parameters of the lower level transition of Tm3+ion were calculated. The results show that:(1) the 3F4has a longer level lifetime,which is suitable for up-conversion intermediate level;(2)3H5 has a longer level life-time,and the transition branching ratio of 3H5→3H6 is close to 100%(96.46%), so this sample can be used to generate 1216 nm laser.关键词
Tm3+/YNbO4/上转换发光/J-O理论Key words
Tm3+/YNbO4/up conversion luminescence/J-O theory分类
数理科学引用本文复制引用
李磊伟,吕勇,牛春晖,郎晓萍..YNbO4:Tm3+/Yb3+上转换发光特性研究[J].发光学报,2018,39(4):449-456,8.基金项目
北京市自然科学基金(4154071) （4154071）
北京市优秀人才培养资助青年骨干个人项目(201400002012G105)资助Supported by Natural Science Foundation of Beijing(4154071) （201400002012G105）
Beijing Excellent Talent Training for Young Backbone Individual Project(201400002012G105) （201400002012G105）
