Abstract
The photoluminescence of Terbium-activated yttrium aluminate with the general formula Y3-xTbXAl5O12was investigated as a function of Tb3+concentration. The main attention is focused on the 5D3/5D4fluorescence and its energy transfer behavior. The emission and excitation spectra were measured in terms of Tb3+concentration and analyzed in view of the application for plasma display panel (PDP). Also, the diffuse reflectance spectra were measured and analyzed in the range from VUV to UV. As a result, the yttrium aluminate was found to have a broad excitation band extending from VUV to UV range and to show the typical concentration quenching behaviors both for 5D3and 5D4fluorescence. The energy transfer was investigated by analyzing the decay curve of 5D3and 5D4emission based on the multipolar interaction or the exchange interaction. The decay curves of 5D3emission, for which well known cross relaxation has been accepted as a main factor, were analyzed by Inokuti and Hirayama's formula based on the direct quenching scheme. The decay curves of 5D4emission were analyzed by Yokota and Tanimoto's formula based on the diffusion limited quenching scheme.
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