A method of determination of Mn concentration in ZnS:Mn based on existence of two manganese kinetic components is proposed. In the method the manganese concentration is determined by lifetime and initial intensity of electroluminescence measurements. The results of the measurements are compared with statistical distributions of single Mn 2+ ions and Mn2 +-Mn2 + pairs in hexagonal ZnS.

Electroluminescent thin film cells based on luminescent active ZnS:Mn layers are investigated. Untypical behaviour of the electroluminescence compared to direct excitation luminescence is observed when the cells are excited by short voltage pulses of about 10 μs. The model of energy transfer between two monomolecular centres is taken into account to explain this phenomenon. On the base of this model, a relation describing the time dependence of luminescence during the exciting pulse is obtained. It is shown that the relation is in good agreement with experimental data.

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