Luminescent Properties of BaSi2O5:Eu2+ Phosphor Film Fabricated by Spin-Coating of Ba-Eu Precursor on SiO2 Glass

Well-crystallized BaSi2O5:Eu2+ phosphor films were synthesized by heat treatment of spin-coated BaO:Eu on SiO2 glass. We investigated luminescence-structure properties of these phosphor films as a function of heat-treatment temperature. From x-ray diffraction patterns, our BaSi2O5:Eu2+ phosphor films revealed that (111)- and (204)-crystal planes of BaSi2O5 crystal were dominantly increased with an increase of heat-treatment temperature. Photoluminescence intensities of BaSi2O5:Eu2+ phosphor films were increased with amount of these crystal planes. It can be explained that Eu2+ ions were stably occupied at specific crystal orientation of BaSi2O5 crystal, enhancing the luminescent intensities of BaSi2O5:Eu2+ phosphor films. In addition, our BaSi2O5:Eu2+ phosphor films had transmittance of 70% at 510 nm,.due to the dense morphology and specific crystallinity of BaSi2O5:Eu2+ phosphor films.