Correlation between the 1.5 eV photoluminescence band and peroxy linkage in silica glass

In order to understand the origin of the 1.5 eV PL band in silica glass, we studied the correlation between the 1.5 eV PL band and the peroxy linkage (POL: O3Si–O–O–SiO3) or the molecular chlorine models (possible origins of the 3.8 eV absorption band) by laser irradiation at low temperatures (∼20 K). On the basis of our results, we conclude that the origin of the 1.5 eV PL band is not molecular chlorine but POL.