SOL-GEL PREPARATION OF Sm~(2+)-DOPED SILICATE GLASSES AND PERSISTENT SPECTRA HOLE BURNING

摘要

The sol-gel processing has been applied to the preparation of Sm~(2+) ions doped aluminosilicate glasses which show a intense emission of Sm~(2+) ions and the persistent spectra hole burning at room temperature. The gels in the system Al_2O_3-SiO_2 synthesized by the hydrolysis of Si(OC_2H_5)_4, Al(OC_4H_9)_3, and SmCl_3·6H_2O were heated in air at 500°C, followed by reacting with H_2 gas to form the Sm~(2+) ions. The Al_2O_3-SiO_2 glasses are appropriate to react the Sm~(3+) ions with H_2 gas and show the intense photoluminescence of Sm~(2+) ions. In the Al_2O_3-SiO_2 glasses, the reaction of Sm~(3+) ions with H_2 is determined by the first-order kinetics and the activation energy is 1.2 eV. Persistent spectra hole burning is observed at room temperature in the excitationspectrum for the ~7F_0 → ~5D_0 transition of Sm~(2+) ions. The hole width and depth are ～15 cm~(-1) and ～10% of the total intensity, respectively, at 20°C.