Blue PL and EL emissions from Bi-activated binary oxide thin-film phosphors

The photoluminescent (PL) and electroluminescent (EL) characteristics in the thin films of various Bi-activated binary oxide phosphors have been investigated La2O3 Bi, Gd2O3 Bi and Y2O3:Bi phosphor thin films were prepared on thick BaTiO3 ceramic sheet substrates by r.f magnetron sputtering depositions followed by postannealing Intense blue PL emissions were obseived from all Bi-activated binary oxide phosphor thin films postannealed at a high temperature Blue, whitish blue-green or blue-green emissions were observed from thin-film electroluminescent (TFEL) devices fabricated with a La2O3 Bi. a Gd2O3 Bi or a Y2O3 center dot Bi thin-film emitting layer, respectively In addition, high luminance with good color purity in blue EL was obtained in a TFEL device using a La2O3 Bi thin film prepared under optimized conditions. (C) 2009 Elsevier B V All rights reserved