Quenching And Luminescence Efficiency Of Nd[sup]3+[/sup] In YAG

V. Lupei; A. Lupei; S, Georgescu; C. Ionescu; W. M. Yen

doi:10.1117/12.950603

18 May 1989 Quenching And Luminescence Efficiency Of Nd³⁺ In YAG

V. Lupei, A. Lupei, S, Georgescu, C. Ionescu, W. M. Yen

Proceedings Volume 1033, Trends in Quantum Electronics; (1989) https://doi.org/10.1117/12.950603
Event: International Conference on Trends in Quantum Electronics, 1988, Bucharest, Romania

Abstract

The effect of the concentration luminescence quenching of the ⁴F _3/2, level of Nd³⁺ in YAG on the relative efficiency is presented. Based on the analysis of the decay curves in terms of the energy transfer theory, an analytical expression for the relative luminescence efficiency is obtained. In the low concentration range (up to q,1.5 at % Nd³⁺), the efficiency linearly decreases when Nd³⁺ concentration increases. It is also stressed that pairs quenching contribute about 20 % to the nonradiative energy transfer losses. Quantum efficiency of luminescence is an important parameter for the characterization of laser active media; its lowering is due to either multiphonon relaxation or energy transfer processes. The multiphonon non-radiative probability depends on the energy gap between levels, on the phonon energy and temperature; usually at low activator doping it is practically independent on concentration. On the other hand, energy transfer losses show a marked dependence on activator concentration, a fact that severely limits the range of useful con-centration of active centers in some laser crystals. In the YAG:Nd case the minimum energy gap between the Stark components of the 4F,I.) and the next lower level ⁴F_15/2 is of about 4700 cm-1. Since in YAG tree phonons most effdbtively coupled to the Rare pi.th ions have an energy of 1, 700 cm-1, the probability for multiphonon relaxation from the 'F3/, level, even at room temperature, is very low and therefore for low Nd ³⁺ concentrations quantum efficiency is expected to be close to 1.

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V. Lupei, A. Lupei, S, Georgescu, C. Ionescu, and W. M. Yen "Quenching And Luminescence Efficiency Of Nd³⁺ In YAG", Proc. SPIE 1033, Trends in Quantum Electronics, (18 May 1989); https://doi.org/10.1117/12.950603

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