Preparation and luminescent properties of Eu-substituted barium–yttrium orthosilicate phosphors

Abstract Barium–yttrium orthosilicate Ba 9 Y 2 Si 6 O 24 host and luminescent materials composed of Ba 9−3 m /2 Eu m Y 2 Si 6 O 24 ( m = 0.01–0.5) and Ba 9 Y 2− n Eu n Si 6 O 24 ( n = 0.01–0.5) were prepared via a solid-state reaction. The photoluminescence excitation and emission properties of Eu 3+ and Eu 2+ in the prepared orthosilicate phosphors were elucidated. The dependence of the luminescent intensity of the Eu 3+ - and Eu 2+ -doped alkaline–earth orthosilicates on the content of the activators has been investigated. The desired CIE (International Commission on Illumination) values, including emissions throughout the red and green regions of the spectra, were obtained using these phosphors. Based on the integrated emission, the relative quantum efficiency of Ba 9 Y 1.6 Eu 0.4 Si 6 O 24 was determined. These Eu-doped red or green phosphors could be used in applications involving white-light near-UV light-emitting-diodes.