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고상법으로 합성한 YVO<sub>4</sub>:Eu<sup>3+</sup> 적색 형광체의 비대칭비와 발광 특성
장재영,안세혁,방준혁,마권도,김춘수,조신호,Jang, Jae-Young,Ahn, Se-Hyeok,Bang, Jun-Hyuk,Ma, Kwon-Do,Kim, Choon-Soo,Cho, Shin-Ho 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.4
$Y_{1-x}VO_4:Eu_x^{3+}$ red phosphors were synthesized with changing the mol ratios of $Eu^{3+}$ ions by using the solid-state reaction method. The crystalline structure of phosphors was found to be a tetragonal system with the maximum diffraction intensity at $25.02^{\circ}$. The grain particles showed the truncated hexagonal patterns with a very homogeneous size distribution at 0.05 mol of $Eu^{3+}$ ion. The excitation spectra of the phosphor ceramics were composed of a broad band centered at 303 nm and weak narrow multilines peaked in the range of 360-420 nm. The dominant emission spectrum was the strong red emission centered at 619 nm due to the $^5D_0{\rightarrow}^7F_2$ electric dipole transition. The experimental results suggest that the optimum doping mol ratio of $Eu^{3+}$ ions for preparing the red phosphors is 0.10 mol with the asymmetry ratio of 5.21.