Abstract
The luminescent characteristics were investigated with the lead- and the tin-activated zinc sulphide phosphors. The bright orange-yellow and orange-red emissions were observed with the lead- and the tin-activated phosphors, respectively, when the phosphors were obtained in a controlled sulphurizing atmosphere. The preparative conditions for obtaining intense luminescent emissions were studied. The emission and the excitation spectra for these phosphors were measured and were found to be well described with Gaussian curves. For the yellow luminescence in the lead-activated phosphors the temperature dependences of emission and of excitation band-widths were studied and configuration coordinate curves were calculated. It vwas concluded that the luminescent centers responsible for these emissions are tetravalent impurity ions substituted at zinc sites and not associated with zinc vacancies. The electron transfer from neighboring sulphur ions was proposed as a possible mechanism for the luminescent process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
