Effect of alkaline metal ions on the photoluminescence properties of Eu³⁺-doped Ca₃Al₂O₆ phosphors

Kyeongsoon Park，Joon Woo Pi，Deshmukh Abdul Hakeem

Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University

摘 要：Ca₃–xAl₂O₆:x Eu³⁺（0.02≤x≤0.10） and Ca_2.92Al₂O₆:0.04Eu³⁺,0.04M⁺（M⁺=Li⁺, Na⁺, and K⁺） phosphors were prepared by sol-gel method and their photoluminescence properties were investigated. The crystal structure of the annealed Ca₃–xAl₂O₆:x Eu³⁺ and Ca_2.92Al₂O₆:0.04Eu³⁺,0.04M⁺ phosphors was analyzed with X-ray diffraction（XRD）. The size and morphological characteristics of the annealed phosphors were investigated with a field emission scanning electron microscope（FE-SEM）. The photoluminescence properties were evaluated with a spectrofluorometer. The phosphors were effectively excited by the light of 396 nm and showed intense red emission at 616 nm, which originated from the 5D₀→7F₂ transition of Eu³⁺. Among the prepared phosphors, the Ca_2.96Al₂O₆:0.04Eu³⁺ phosphor showed the strongest emission intensity and the highest color purity. The addition of alkaline metal ions（Li⁺, Na⁺, and K⁺） to Ca_2.96Al₂O₆:0.04Eu³⁺ phosphor degraded the emission intensity and color purity.

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