Unique photoluminescence properties of highly crystallized BaMoO4 film prepared by chemical reaction

Highly crystallized luminescent BaMoO4 films have been prepared directly on molybdenum substrates at room temperature (25 C) in barium hydroxide aqueous solution by a simple chemical reaction. In order to form the desired surface morphology and crystal structure, a mild oxidizing agent, NaClO, seems to be the key to the high crystallinity. In alkaline solution, the molybdenum substrate can gradually convert MoO42- ions, combined with Ba2+ ions which have a poor migration just depending on thermal motion to form a film. XRD and SEM results indicate that the films have single phase and uniform surfaces. FA results reveal that the films appear to have scintillating luminescent character when they are under different excitations at room temperature. Further, the excitation and emission wavelengths comply with a linear relationship which will be a potential technological application of BaMoO4 in a variety of optical devices. (C) 2007 Published by Elsevier B.V.