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Numerical simulation of charge transfer and light emission in SrS:Ce thin-film electroluminescent devices

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1 Author(s)
Neyts, Kristiaan ; Dept. of Electron. & Inf. Syst., Ghent Univ., Belgium

When an AC voltage is applied to a thin-film electroluminescent device with an SrS:Ce phosphor layer, the current flowing through the phosphor layer and the emitted light can be complex functions of time. In order to explain the observed current and light waveforms, a numerical model has been constructed for the electrical and optical behavior of such a device. This model is based on the tunneling of electrons from the phosphor-insulator interface, multiplication of the electron current and creation of positive space charge in the high field region, recombination of electrons with the positive charges in the low-field region, and a back-flow of electrons from the anodic interface when the field there changes sign. The rather simple model is able to simulate a number of features observed in current and light characteristics quite well. It could serve as a reference for the interpretation of new experimental results

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Electron Devices, IEEE Transactions on  (Volume:43 ,  Issue: 9 )