Electronic transport in thin film electroluminescence of SrS:Ce

Thin film electroluminescent (TFEL) devices based on the scheme of ${\mathrm{SiO}}_{\mathrm{2}}{\mathrm{/SrS:Ce/SiO}}_{\mathrm{2}}\mathrm{/SiO}$ were fabricated, and blue–green emission was observed in the devices. The electronic transport process is strongly affected by the mixing interaction between the conduction band of SrS and the excited state of ${\mathrm{Ce}}^{\text{3+}}.$ The photoluminescent excitation and the wave forms of time-dependent electroluminescent emission show that recombinant luminescence is the main process in SrS:Ce TFEL. The experimental results reveal that the excitation mechanism is related to the sulfur vacancies.