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Current crowding and phosphor efficacy in ac thin‐film electroluminescent display devices

1996; Wiley; Volume: 4; Issue: 2 Linguagem: Inglês

10.1889/1.1984991

1938-3657

Vijay Pratap Singh, Suraj Bhaskaran, J.C. McClure,

Luminescence Properties of Advanced Materials

Abstract— The variation of luminance with transferred charge in ZnS:Mn ac thin‐film electroluminescent (ACTFEL) display devices was analyzed to determine the roles played by the preferred current paths (filamentary conduction) and manganese clustering in limiting the phosphor efficiency. Luminance‐charge ( L‐Q ) characteristics were measured in ZnS:Mn ACTFEL devices of varying Mn concentrations. L‐Q characteristics showed a reduction in slope at higher values of Q . Also, the value of Q where the slope changed varied with the Mn/Zn ratio. These effects were attributed to the existence of preferred current paths in the phosphor layer where hot‐electron flow clustered.