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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.