PHOTOLUMINESCENCE IN ZNO-CDO-SIO2 GLASSES

Photoluminescence (PL) experiments have been carried out in glasses fr om the ZnO-CdO-SiO2 system. The glasses exhibit broad bands in the PL spectra centered between 540 and 560 nm for emissions and at about 250 nm for excitations. Decay time curves for the different glass samples appear, within experimental errors, quite similar. The curves are not a simple exponential and have been discomposed as a sum of three expo nentials with lifetime components of about 0.025, 0.1, and 0.52 ms. Th e results seem to indicate that luminescence is dominated by short ord ering, nuclei and/or crystalline centers.