Rare earth ions on the crystal in the spectral intensity of ff transition
This paper introduces the crystal ff transition spectra of rare earth ions in the strength of theoretical research. Specific work is divided into two parts: the first part and resolve the Judd-Ofelt theory of "association similar to" calculate the configuration energy level of rare earth ions 4fN intensity of the emission spectrum there is a big deviation, modified the traditional theory. The second part, of a cathode-ray excitation X-ray or the spectral properties of long afterglow materials research and application of Judd-Ofelt calculation of the configuration of the doped rare earth ions 4fN intensity of emission spectrum of the low energy levels, thus achieving the experimental explain the phenomenon. Main contents and results are as follows:
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1 on the Pr3 + doped CaAl12O19 and SrAl12O19 system for research, given the 4f2 configuration of Pr3 + transitions within the electric dipole strength is calculated. Taking into account the 4f2 4f5d configuration of the hybrid state level and the energy difference is different from the traditional all parameters modified Judd-Ofelt theory, the introduction of the calculation of the strength parameters λ is odd. According to the experimental measurement of the 3P0 level down to level emission intensity ratio and lifetime value of its intensity can get these parameters. Will be back on behalf of the intensity parameters to the transition probability calculation, energy levels are 3P0 and 1S0-level lifetime and the transition down the intensity of each level, the results show that the modified Judd-Ofelt theory dealing with high-level emission intensity greatly improved.
2 Select the YPO4: Nd3 + system, consider the 4f 25d configuration of a clear impact on the ff transition. Dealing with a simple model of Duan 4f 25d configuration. Tensor method using standard odd crystal field and the configuration between the electric dipole transition matrix elements are in direct electric dipole transition intensity by the expression ff, which contains a decision fd mixed mathematical factors and is determined by the experimental data to be fitting the strength parameters. From the ground state 4I9 / 2 of the absorption intensity to fit the strength parameters, and return on behalf of the oscillator strength calculations, has been the ground state absorption oscillator strength and energy level 2G (2) 9 / 2 down to level emission intensity, The results show that this model is reasonable.
3 of Tb3 + doped KY3F10 system in the X-ray or cathode ray excitation of the afterglow phenomenon. Because (5D3, 7F6) - (5D4, 7F0) cross-relaxation, afterglow color with the amount of Tb3 + doped different adjustable. Calculated by the Judd-Ofelt theory has been 5D3, 5D4 energy level spectroscopy parameters, combined with the analysis of luminescence dynamics, given the rate of cross relaxation, efficiency and blue-green Yuhui Jiang ratio, calculated results and experimental results are consistent with .
