Surface acoustic wave-induced electroluminescence intensity oscillation   in planar light-emitting devices
  Electroluminescence emission from surface acoustic wave-driven light-emitting diodes (SAWLEDs) is studied by means of time-resolved techniques. We show that the intensity of the SAW-induced electroluminescence is modulated at the SAW frequency (~1 GHz), demonstrating electron injection into the p-type region synchronous with the SAW wavefronts. 
Marco Cecchini, Vincenzo Piazza, Fabio Beltram, D. G. Gevaux, M. B.   Ward, A. J. Shields, H. E. Beere, D. A. Ritchie