Electronic transport in thin film electroluminescence of SrS : Ce

Thin film electroluminescent (TFEL) devices based on the scheme of SiO2/SrS :Ce/SiO2/SiO were fabricated, and blue-green emission was observed in the d evices. The electronic transport process is strongly affected by the mixing interaction between the conduction band of SrS and the excited state of Ce 3+. The photoluminescent excitation and the wave forms of time-dependent el ectroluminescent emission show that recombinant luminescence is the main pr ocess in SrS:Ce TFEL. The experimental results reveal that the excitation m echanism is related to the sulfur vacancies. (C) 2000 American Institute of Physics. [S0021- 8979(00)07220-0].