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SrS:Cu, Cl thin-film electroluminescent (TFEL) devices have been prepared by hot-wall deposition using a successive supply of source materials. The TFEL devices show blue EL emission with the chromaticity coordinate of (0.19, 0.28). The luminance and the efficiency at 1 kHz drive are 100 cd/m2 and 0.1 lm/W, respectively. EL emission is observed at both the leading and the trailing edge of the applied pulse voltage. The presence of trailing edge emission implies that Cu+ centers are ionized during EL excitation, and then electrons are subsequently captured by ionized Cu2+ centers giving rise to the EL emission.

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The electroluminescent (EL) and photoluminescent (PL) characteristics in new blue emitting Bi-activated La 2 O 3 oxide phosphor thin films prepared using a conventional or a combinatorial r.f. magnetron sputtering deposition method followed by postannealing are investigated. Intense blue PL emission was observed from the prepared La 2 O 3 :Bi phosphor thin films. In addition, a high-luminance in blue EL emission was obtained in thin-film electroluminescent (TFEL) devices fabricated using the La 2 O 3 :Bi phosphor thin films as the emitting layer. Differences between the observed PL and EL emission spectra are attributed to the selection rule in the 6s 2 -6s6p transitions of Bi 3+ being resolved by a high electric field applied to the La 2 O 3 :Bi phosphor thin film.