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Full-profile fitting of emission spectrum to determine transition intensity parameters of Yb3+: GdTaO4 |
| Qingli Zhang(张庆礼)1, Guihua Sun(孙贵花)1, Kaijie Ning(宁凯杰)1, Chaoshu Shi(施朝淑)2, Wenpeng Liu(刘文鹏)1, Dunlu Sun(孙敦陆)1, Shaotang Yin(殷绍唐)1 |
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 |
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Abstract The Judd-Ofelt theoretic transition intensity parameters Atpk 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 Atpk 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 Atpk, 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 Atpk 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 Atpk and other parameters, so it is usually viable to determine Atpk and other parameters using a large number of experimental values. We applied this method to determine twenty-five Atpk of Yb3+ 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 Yb3+:GdTaO4 also indicate that the F-L formula gives larger values in the wavelength range with reabsorption.
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Received: 22 June 2016
Revised: 28 July 2016
Accepted manuscript online:
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PACS:
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78.55.-m
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(Photoluminescence, properties and materials)
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78.60.Lc
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(Optically stimulated luminescence)
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75.10.Dg
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(Crystal-field theory and spin Hamiltonians)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51172236, 51502292, 51272254, 51102239, 61205173, and 61405206). |
Corresponding Authors:
Qingli Zhang
E-mail: zql@aiofm.ac.cn
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Cite this article:
Qingli Zhang(张庆礼), Guihua Sun(孙贵花), Kaijie Ning(宁凯杰), Chaoshu Shi(施朝淑), Wenpeng Liu(刘文鹏), Dunlu Sun(孙敦陆), Shaotang Yin(殷绍唐) Full-profile fitting of emission spectrum to determine transition intensity parameters of Yb3+: GdTaO4 2016 Chin. Phys. B 25 117802
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