СИНТЕЗ И ИССЛЕДОВАНИЕ ИК–ЛЮМИНЕСЦЕНЦИИ ТВЕРДЫХ РАСТВОРОВ (Y1-xYbx)3Al5O12 ПРИ ЛАЗЕРНОМ ВОЗБУЖДЕНИИ

Abstract

This research work is dedicated to research and development of luminescent properties of solid solutions (Y1- x Yb x )3Al5O12 with laser excitation. The spectra of infrared luminescence excited by a laser beam with a wavelength of 0.94 microns. The analysis of the luminescence spectra obtained for solid solutions with different concentrations of ytterbium ions in the composition, and the dependences of the luminescence intensity of the activator composition. Found that in the concentration range of ytterbium ions in the (0.03 £ x £ 0.09), there is a significant increase in the intensity of the luminescence in the 1036 nm and reaches a maximum. With further increase in the concentration of ytterbium ions in the range (0.09 £ x £ 0.115), a decrease in the intensity of luminescence. Decrease in the intensity of luminescence caused by the action of migration and multipole interactions between the ions of ytterbium. And this is due to the fact that at higher concentrations, the probability of recombination energy between ytterbium ions and various quenching centers. Change in the concentration of ytterbium ions has also a strong influence on the kinetic characteristics of the infrared luminescence of solid solutions (Y1- x Yb x )3Al5O12. When the concentration of the activator to 0.03 mole fractions of the afterglow time constant (t) increases monotonically from 1040 μs to 1120 μs. With a further increase in the content of the activator in the solid solution, t decreases monotonically and the activator concentration of 0.15 mole fractions of 744 microseconds. Solid solutions (Y1- x Yb x )3Al5O12 with maximum intensity infrared luminescence in the band 1036 mm damping constant of about 794 μs.