Experimental investigation of currents and efficiencies in SrS:Ce thin-film electroluminescent devices

摘要

In thin-film electroluminescent displays the electrical properties of the phosphor material are very important for the device performance. The electric field and the current in the phosphor layer may be quite inhomogeneous due to multiplication and space charge, even in devices without filamentary behavior. Measuring the ratio of luminance to current provides information about the mechanism of the light-generation process. The currents and the efficiencies for SrS:Ce devices with different thicknesses and different bottom layers are discussed and compared with numerical simulations.