The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform
M Couto Dos A Santos - One of the best experts on this subject based on the ideXlab platform.
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enhanced approach to the eu3 ion 5d0 7f0 Transition Intensity
Optical Materials, 2013Co-Authors: A S Souza, Y A R Oliveira, M Couto Dos A SantosAbstract:Abstract The dependence of the 5D0 → 7F0 Transition Intensity with the linear terms of the crystal field parameter and polarizability of the Eu3+ ion is predicted. It is shown that the breakdown of the closure approximation mechanism is the most important one if the Eu3+ ion has a finite dipole moment in the ground state. The Eu:BFCl crystal is used for comparison with a satisfactory agreement.
A S Souza - One of the best experts on this subject based on the ideXlab platform.
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enhanced approach to the eu3 ion 5d0 7f0 Transition Intensity
Optical Materials, 2013Co-Authors: A S Souza, Y A R Oliveira, M Couto Dos A SantosAbstract:Abstract The dependence of the 5D0 → 7F0 Transition Intensity with the linear terms of the crystal field parameter and polarizability of the Eu3+ ion is predicted. It is shown that the breakdown of the closure approximation mechanism is the most important one if the Eu3+ ion has a finite dipole moment in the ground state. The Eu:BFCl crystal is used for comparison with a satisfactory agreement.
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Enhanced approach to the Eu3+ ion 5D0 → 7F0 Transition Intensity
Optical Materials, 2013Co-Authors: A S Souza, Y A R Oliveira, M.a. Couto Dos SantosAbstract:Abstract The dependence of the 5D0 → 7F0 Transition Intensity with the linear terms of the crystal field parameter and polarizability of the Eu3+ ion is predicted. It is shown that the breakdown of the closure approximation mechanism is the most important one if the Eu3+ ion has a finite dipole moment in the ground state. The Eu:BFCl crystal is used for comparison with a satisfactory agreement.
Y A R Oliveira - One of the best experts on this subject based on the ideXlab platform.
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enhanced approach to the eu3 ion 5d0 7f0 Transition Intensity
Optical Materials, 2013Co-Authors: A S Souza, Y A R Oliveira, M Couto Dos A SantosAbstract:Abstract The dependence of the 5D0 → 7F0 Transition Intensity with the linear terms of the crystal field parameter and polarizability of the Eu3+ ion is predicted. It is shown that the breakdown of the closure approximation mechanism is the most important one if the Eu3+ ion has a finite dipole moment in the ground state. The Eu:BFCl crystal is used for comparison with a satisfactory agreement.
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Enhanced approach to the Eu3+ ion 5D0 → 7F0 Transition Intensity
Optical Materials, 2013Co-Authors: A S Souza, Y A R Oliveira, M.a. Couto Dos SantosAbstract:Abstract The dependence of the 5D0 → 7F0 Transition Intensity with the linear terms of the crystal field parameter and polarizability of the Eu3+ ion is predicted. It is shown that the breakdown of the closure approximation mechanism is the most important one if the Eu3+ ion has a finite dipole moment in the ground state. The Eu:BFCl crystal is used for comparison with a satisfactory agreement.
Kaijie Ning - One of the best experts on this subject based on the ideXlab platform.
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Full-profile fitting of emission spectrum to determine Transition Intensity parameters of Yb 3 + :GdTaO 4
Chinese Physics B, 2020Co-Authors: Qingli Zhang, Kaijie NingAbstract:The Judd–Ofelt theoretic Transition Intensity parameters 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 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 , 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 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 and other parameters, so it is usually viable to determine and other parameters using a large number of experimental values. We applied this method to determine twenty-five 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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full profile fitting of emission spectrum to determine Transition Intensity parameters of yb 3 gdtao 4
Chinese Physics B, 2016Co-Authors: Qingli Zhang, Kaijie NingAbstract:The Judd–Ofelt theoretic Transition Intensity parameters 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 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 , 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 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 and other parameters, so it is usually viable to determine and other parameters using a large number of experimental values. We applied this method to determine twenty-five 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.
Ling Li - One of the best experts on this subject based on the ideXlab platform.
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eu3 2 co doping system induced by adjusting al y ratio in eu doped cayalo4 preparation bond energy site preference and 5d0 7f4 Transition Intensity
RSC Advances, 2018Co-Authors: Wenjun Wang, Haibing Xu, Liqun Zhou, Jung Hyun Jeong, Ling LiAbstract:CaY1−xAl1+xO4:2%Eu (x = 0, 0.1, 0.2) phosphors have been synthesized via a solid-state reaction process. XRD patterns indicate that they are pure phase. The photoluminescence properties of the CaY1−xAl1+xO4:2%Eu phosphors exhibit both the blue emission of Eu2+ (4f65d1–4f7) and red-orange emission of Eu3+ (5D0–7F1,2,3,4) under UV light excitation, which showed that the Eu3+/2+ co-doping system was obtained by adjusting the Al/Y ratio. Eu3+ ions can be reduced to Eu2+ ions when the Al/Y ratio was changed. In this work, the bond energy method was used to determine and explain the mechanism of the site occupation of Eu ions entering the host matrix. Also, the emission spectrum showed an unusual comparable Intensity 5D0–7F4 Transition peak. The relative Intensity of 5D0–7F2 and 5D0–7F4 can be stabilized by changing the relative proportions of Al3+ and Y3+. Furthermore, this was explained by the J–O theory.
