Full-profile fitting of emission spectrum to determine transition intensity parameters of Yb3＋ ：GdTaO4  

作　　者：张庆礼 孙贵花 宁凯杰 施朝淑 刘文鹏 孙敦陆 殷绍唐 

机构地区：[1]The Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China [2]Physics Department of the Science and Technology of China, Hefei 230026, China

出　　处：《Chinese Physics B》2016年第11期541-550,共10页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.51172236,51502292,51272254,51102239,61205173,and 61405206)

摘　　要：The Judd-Ofelt theoretic transition intensity parameters A（tp）k of luminescence of rare-earth ions in solids are important for the quantitative analysis of luminescence.It is very difficult to determine them with emission or absorption spectra for a long time.A ＂full profile fitting＂ method to obtain A（tp）k in solids with its emission spectrum is proposed,in which the contribution of a radiative transition to the emission spectrum is expressed as the product of transition probability,line profile function,instrument measurement constant and transition center frequency or wavelength,and the whole experimental emission spectrum is the sum of all transitions.In this way,the emission spectrum is expressed as a function with the independent variables intensity parameters A（tp）k,full width at half maximum（FWHM） of profile functions,instrument measurement constant,wavelength,and the Huang-Rhys factor S if the lattice vibronic peaks in the emission spectrum should be considered.The ratios of the experimental to the calculated energy lifetimes are incorporated into the fitting function to remove the arbitrariness during fitting A（tp）k and other parameters.Employing this method obviates measurement of the absolute emission spectrum intensity.It also eliminates dependence upon the number of emission transition peaks.Every experiment point in emission spectra,which usually have at least hundreds of data points,is the function with variables A（tp）k and other parameters,so it is usually viable to determine A（tp）k and other parameters using a large number of experimental values.We applied this method to determine twenty-five A（tp）k of Yb（3＋） in GdTaO4.The calculated and experiment energy lifetimes,experimental and calculated emission spectrum are very consistent,indicating that it is viable to obtain the transition intensity parameters of rare-earth ions in solids by a full profile fitting to the ions＇ emission spectrum.The calculated emission cross sections of Yb（3＋）：GdTaO4 aThe Judd-Ofelt theoretic transition intensity parameters A（tp）k of luminescence of rare-earth ions in solids are important for the quantitative analysis of luminescence.It is very difficult to determine them with emission or absorption spectra for a long time.A ＂full profile fitting＂ method to obtain A（tp）k in solids with its emission spectrum is proposed,in which the contribution of a radiative transition to the emission spectrum is expressed as the product of transition probability,line profile function,instrument measurement constant and transition center frequency or wavelength,and the whole experimental emission spectrum is the sum of all transitions.In this way,the emission spectrum is expressed as a function with the independent variables intensity parameters A（tp）k,full width at half maximum（FWHM） of profile functions,instrument measurement constant,wavelength,and the Huang-Rhys factor S if the lattice vibronic peaks in the emission spectrum should be considered.The ratios of the experimental to the calculated energy lifetimes are incorporated into the fitting function to remove the arbitrariness during fitting A（tp）k and other parameters.Employing this method obviates measurement of the absolute emission spectrum intensity.It also eliminates dependence upon the number of emission transition peaks.Every experiment point in emission spectra,which usually have at least hundreds of data points,is the function with variables A（tp）k and other parameters,so it is usually viable to determine A（tp）k and other parameters using a large number of experimental values.We applied this method to determine twenty-five A（tp）k of Yb（3＋） in GdTaO4.The calculated and experiment energy lifetimes,experimental and calculated emission spectrum are very consistent,indicating that it is viable to obtain the transition intensity parameters of rare-earth ions in solids by a full profile fitting to the ions＇ emission spectrum.The calculated emission cross sections of Yb（3＋）：GdTaO4 a

关 键 词：fitting absolute remove luminescence viable relaxation hundreds incorporated instrument iteration 

分 类 号：O482.31[理学—固体物理]