Optical properties of ZnS: (Cu+Mn) phosphors have been extensively studies with the purpose to investigate the phenomena of sensitized luminescence in photoconductive phosphors. Spectra of emission, absorption and axcitation, thermoluminescence and photo-conductivity were measured. It was confirmed from the measurement of excitation spectra that the manganese emission is really sensitized by coper behaving as a sensitizer. Some interesting phenomena ascribe to this sensitization were found in the measurements of thermoluminescence and photoconductivity. The mechanism of the sensitization was discussed exhaustively. It appears reasonable to conclude tentatively in the present situation that the resonance transfer rather than the photoelectron transfer is the predominant mechanism.
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Shigeo Shionoya (1956) studied this question.
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