Bright white-light electroluminescence in SrS:Pr,K thin films

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Abstract
A bright white‐light electroluminescence (EL) is obtained in a SrS:Pr,K thin‐film EL device. The device shows a luminance level of 500 cd/m2 with 1 kHz drive (1500 cd/m2 at 5 kHz), which is five times as high as that obtained for a ZnS:Pr,F thin‐film EL device. The dominant EL excitation mechanism in the SrS:Pr,K device responsible for a higher EL efficiency is ascribed to a process wherein the ionization of the luminescent center occurs first. Subsequent recombination with an electron follows in which the Pr3+ center reaches a (4 f )2 excited state through a (4 f )(5d) excited state. Finally, luminescence due to the relaxation of the (4 f )2 electron configuration of the Pr3+ ion arises.