Field dependence of a.c. Electroluminescence in ZnS: Mn,Cu, Cl film panels |
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Authors: | W.O. Chan R.M. Yu |
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Affiliation: | Department of Physics, University of Hong Kong, Hong Kong, China |
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Abstract: | Electroluminescent (EL) film panels of ZnS: Mn, Cu, Cl operated by a.c. electric field are studied at room temperature. The emission spectrum consists of a single peak at 590 nm. The EL emittance B varies with frequency f of the applied a.c. electric field as B = Bs ? Bm exp ? f/fc where Bs, Bm and fc are constants. This equation indicates that B approaches a saturation value Bs when f?fc and a linear relation between B and f when f?fc. At a fixed frequency f, B is found to depend on the applied voltage V as B = A exp [-G/F + V)] where A, G and F are constants. This formula is valid at all stages of the operating life of the film panel. |
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