Spectral characteristics and energy transfer Ce-=SUP=-3+-=/SUP=-->Tb-=SUP=-3+-=/SUP=-->Eu-=SUP=-3+-=/SUP=- in LuBO-=SUB=-3-=/SUB=-(Ce, Tb, Eu) compound

Abstract

The structure, IR, luminescence, and luminescence excitation spectra of Ce3+, Tb3+, and Eu3+ ions in Lu1-2xCexEuxBO3 and Lu0.91-2xCexTb0.09EuxBO3 solid solutions were studied. The minimum "threshold" distance between Ce3+ and Eu3+ ions was estimated, at which there is no charge transfer between these ions, leading to the quenching of Ce3+ and Eu3+ luminescence. It is shown that in Lu0.91-2xCexTb0.09EuxBO3 compounds, the range of Ce and Eu concentrations of 0.2-0.25 at.% is optimal for obtaining the maximum luminous intensity of this compound. Keywords: phosphors for LEDs, rare earth orthoborates, X-ray diffraction analysis, IR spectroscopy, luminescence spectra.