Effects of Fluoride Dopants in the Starting Materials for BaAl₂S₄:Eu Thin-Film Phosphors

Abstract

BaF 2 and AlF 3 were used for the preparation of BaAl 2 S 4 :Eu thin-film phosphors. The blue emission with a peak at 470 nm was obtained particularly because the process temperature was not sufficient for obtaining a peak at 470 nm in the case of a conventional technique. The intensity of the blue emission from BaAl 2 S 4 :Eu phosphors prepared using fluoride compounds was higher than that of phosphors prepared without fluoride compounds, and the appropriate annealing temperature decreased during the preparation process. It is considered that BaF 2 and AlF 3 enhanced the reaction of starting materials and accelerated the crystallization of BaAl 2 S 4 . The crystallinity and mean crystal particle size of BaAl 2 S 4 :Eu phosphors prepared using fluoride compounds were improved. This is due to the fluoride compounds effectively acting as flux materials.

Evaluation of distributed-type inorganic electroluminescence devices using comb-shaped electrodes

“…An improved luminance in thin-film EL devices has also been reported. [25][26][27][28][29][30][31][32] In particular, EL devices using high-luminance blue-emitting phosphors have achieved high luminance and long lifetime, and these devices have been tested for application in full-color displays using a technique based on color conversion to display the three primary colors. 33) Moreover, the matrixing of distributed EL devices, which has been proposed for use in the mass production of simple-pattern devices, has also been reported.…”

Characteristics of distributed-type inorganic electroluminescence panels with comb-shaped electrodes

“…The improvement of luminance for thin-film EL devices has already been reported [25][26][27][28][29][30][31][32]. In particular, EL devices using high-luminance blue-emitting phosphors have achieved a high luminance and a long lifetime, and have been examined for application to full-color displays using a technique for displaying the three primary colors through color conversion [33].…”