Luminescence response of SrS:CeF3 ACTFEL devices to various pulse waveforms

The steady-state luminescence responses of SrS:CeF₃ ACTFEL devices to voltage plus trains of simple pulse, stepped-pulse, and notched-pulse waveforms are presented. The results are interpreted in terms of a model that ascribes the leading-edge luminescence peak to impact excitation or ionization of the activators and the downstep luminescence peak to the release of electrons from the shallower interface states, followed by trapping in the bulk phosphor and subsequent transfer to an activator-trap complex where luminescence is produced by radiative recombination. The steady-state current and luminescence response of the device to a trapezoidal waveform are in accord with the predictions of the model