Abstract: Na₂O-B₂O₃-SiO₂ pyrex glasses with ZnS:Mn²⁺ nanocrystals were prepared by melt method. The characteristics of EPR spectra and emission spectra of Mn²⁺ ions in pyrex glasses with dispersed ZnS:Mn²⁺ nanocrystals were studied. Sample e (ZnS:Mn²⁺/glasses 10%) were detected under 6.5mW and 200mW microwave power. It was found that there are two configurations of Mn²⁺ ions in the samples, or (Mn²⁺) substitution and (Mn²⁺) interstitial configurations. The research results show that the substitution state Mn²⁺ ions and distortion degree of cubic crystal fields directly effects luminous characteristic. The other of configuretions for the effects of luminous characteristic also were discussed.
These results can be used to address the question of the physical origin of the high efficiency transfer and shortened radiative lifetime seen in photoluminescence.

Key words: ZnS:Mn²⁺ nanocrystals, EPR spectra, Substitution state, Interstitial state