Luminescence of phosphorus doped crystalline α-quartz and phosphosilicate glass with content
3P2O5 7SiO2 was studied. Water and OH groups are found by IR spectra in these materials. The spectrum
of luminescence contains many bands in the range 1.5–5.5 eV. The luminescence bands in UV range at
4.5–5 eV are similar in those materials. Decay duration in exponential approximation manifests a time
constant about 37 ns. Also a component in ms range was detected. PL band of ms component is shifted to
low energy with respect to that of 37 ns component. This shift is about 0.6 eV. It is explained as
singlet–triplet splitting of excited state. Below 14 K increase of luminescence kinetics duration in ms
range was observed and it was ascribed to zero magnetic field splitting of triplet excited state of the
center.