Synthesis and Luminescence Properties of Ba₃Y_1-xEu_xB₃O₉ (0.05≤x≤0.35) under UV Excitation

Abstract:

Single phase of Ba₃Y_{1 - x}Eu_xB₃O₉ (0.05 ≤ x ≤ 0.35) samples was prepared by the solid state reaction. The crystal structure, the surface, the particle size and luminescence properties were characterized by X-ray diffractometer, scanning electron microscopy and spectrophotometer. The results showed that the obtained samples with the particle size from 0.3 to 1.5 um were hexagonal structure. Monitored by 592 nm emission, the excitation spectra of Ba₃Y_{1 - x}Eu_xB₃O₉ were dominated by the charge transfer band of O^2-→Eu³⁺ peaking at about 259 nm until x = 0.15; the transition from ⁷F₀ to ⁵L₆ level of Eu³⁺ at about 395 nm was maximum after x > 0.15. The strongest emission peak due to the ⁵D₀→⁷F₁ transition of Eu³⁺ was all located at about 592 nm in the emission spectra of Ba₃Y_{1 - x}Eu_xB₃O₉, and the maximum emission was obtained at x = 0.15 and 0.3 under 254 and 395 nm excitation, respectively. The excitation process under the two excitation energies was analyzed. It indicated that only the centrosymmetric lattices could be excited under 254 nm excitation; both the centrosymmetric and noncentrosymmetric positions could be excited by 395 nm, accordingly, the ratio of the red emission (⁵D₀→⁷F₂) to the orange one (⁵D₀→⁷F₁) increased, leading to a better chromaticity of the phosphors.

• Periodical: Advanced Materials Research (Volume 906)
• Pages: 60-65
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.906.60
• Online since: April 2014
• Authors: Xiao Xia Li
• Keywords: Ba₃YB₃O₉:Eu³⁺, Luminescence, Phosphor, UV

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