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Ca_3–xAl_2O_6:x Eu~(3+)(0.02≤x≤0.10) and Ca_(2.92)Al_2O_6:0.04Eu~(3+),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 Ca_3–xAl_2O_6:x Eu~(3+) and Ca_(2.92)Al_2O_6:0.04Eu~(3+),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 5D_0→7F_2 transition of Eu~(3+). Among the prepared phosphors, the Ca_(2.96)Al_2O_6:0.04Eu~(3+) phosphor showed the strongest emission intensity and the highest color purity. The addition of alkaline metal ions(Li~+, Na~+, and K~+) to Ca_(2.96)Al_2O_6:0.04Eu~(3+) phosphor degraded the emission intensity and color purity.
(3 +), 0.04M ~ + (M ~ + = Li ~ +, Na ~ +, Ca_3-xAl_2O_6: x Eu ~ The crystal structure of the annealed Ca_3-xAl_2O_6: x Eu ~ (3+) and Ca_ (2.92) Al_2O_6: 0.04Eu ~ (3+ ) 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 efficiently excited by the light of 396 nm and showed intense red emission at 616 nm, which originated from the 5D_0 → 7F_2 transition of Eu ~ (3+). Among the prepared phosphors, the Ca_ (2.96) Al_2O_6: 0.04 The addition of alkaline metal ions (Li ~ +, Na ~ +, and K ~ +) to Ca_ (2.96) Al_2O_6: 0.04Eu ~ (3) +) phosphor degrad ed the emission intensity and color purity.