BLUE SRS CU THIN-FILM ELECTROLUMINESCENT DEVICES GROWN BY HOT-WALL DEPOSITION USING SUCCESSIVE SOURCE SUPPLY

SrS:Cu, Cl thin- film electroluminescent (TFEL) devices have been prep ared by hot- wall deposition using a successive supply of source mater ials. The TFEL devices show blue EL emission with the chromaticity coo rdinate of (0.19, 0.28). The luminance and the efficiency at 1 kHz dri ve are 100 cd/m(2) and 0.1 lm/W, respectively. EL emission is observed at both the leading and the trailing edge of the applied pulse voltag e. The presence of trailing edge emission implies that Cu+ centers are ionized during EL excitation, and then electrons are subsequently cap tured by ionized Cu2+ centers giving rise to the EL emission. (C) 1998 American Institute of Physics. [S0003-6951(98)04939-0].