PL and EL Characteristics in New Blue Emitting La2O3:Bi Phosphor Thin Films

Abstract

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.

Effect of Bi3+ Ion Concentration on Physicochemical, Optical and Catalytic Properties of One‐Pot Combustion Synthesized Nanocrystalline Bi‐Doped La2O3

“…All the Bi doped La 2 O 3 compounds show broad blue emission originating from transitions in Bi 3+ ion ( 3 P 1 → 1 S 0 ) and have almost the same emission maximum at 458 nm. Blue emission from Bi doped La 2 O 3 phosphor thin films has been previously reported . The emission intensity increases with increase in dopant (Bi) concentration from x=0.0025 to x=0.005.…”

“…Blue emission from Bi doped La 2 O 3 phosphor thin films has been previously reported. [45] The emission intensity increases with increase in dopant (Bi) concentration from x = 0.0025 to x = 0.005. Thereafter, it decreases gradually with further increase in the dopant concentration from x = 0.01 to x = 0.04.…”

Electroluminescence from Cr3+ in Perovskite Thin-Film Phosphors Using LaAlO3 and LaGaO3 as Hosts

“…For developing inorganic thin-film electroluminescent (TFEL) displays and/or lamps fabricated using oxide phosphor thin films, we must investigate chemically stable oxide phosphor thin films suitable for obtaining high-luminance multicolor emissions. Recently, we reported that intense blue-green PL and EL emissions were observed from binary oxide phosphor thin films using Ga 2 O 3 or La 2 O 3 as the host material (1,2). Luminescent characteristics in Ga 2 O 3 and La 2 O 3 phosphor thin films have also been reported using such a dopant as Mn, Cr, or a rare earth element as the activator (3)(4)(5)(6)(7)(8).…”