Blue SrS : Cu thin film electroluminescent devices grown by hot-wall deposition using successive source supply

Abstract

SrS : Cu, Cl thin film electroluminescent (TFEL) devices have been prepared by the hot-wall deposition using successive supply of source materials. SrS : Cu thin films have a grain size of about 1 μm and have no dead layer. The TFEL devices show blue EL emission with the chromaticity coordinate of (0.19,0.28). The luminance and efficiency at 1kHz drive are 100 cd/m^2 and 0.1lm/W, respectively. The presence of trailing edge emission impulse the EL excitation process that Cu^+ centers are ionized and then the capturing of electrons by ionized Cu^<2+> centers gives rise to the EL emission.