A band at 3eV in the crystal could be ascribed to the remains of self-trapped exciton ,which is strongly quenched at 290 K. it is almost absent in the glass due to much smaller efficiency of self-trapped exciton luminescence in silicaglass
A band at 3eV in the crystal could be ascribed to the remains of self-trapped exciton ,which is strongly quenched at 290 K. it is almost absent in the glass due to much smaller efficiency of self-trappedexciton luminescence in silicaglass