To prepare Mn4+-activated K2TiF6 phosphor, a precipitation method without using hydrofluoric acid (HF) was designed. In the synthetic reaction, to prevent the decomposition of K2MnF6, which is used as a source of Mn4+ activator, NH5F2 solution was adopted in place of the HF solution. Single phase K2TiF6:Mn4+ phosphors were successfully synthesized through the designed reaction at room temperature. To acquire high luminance of the phosphor, the reaction conditions such as the type and concentration of the reactants were optimized. Also, the optimum content of Mn4+ activator was evaluator based on the emission intensity. Photoluminescence properties such as excitation and emission spectrum, decay curve, and temperature dependence of PL intensity were investigated. In order to examine the applicability of this material to a white LED, the electroluminescence property of a pc-WLED fabricated by combining the K2TiF6:Mn4+ phosphor with a 450 nm blue-LED chip was measured.

1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 References

• 김연(한국화학연구원 차세대전지소재연구센터, 한양대학교 신소재공학과) | Yeon Kim
• 우미혜(한국화학연구원 차세대전지소재연구센터) | Mihye Wu
• 최성호(한국화학연구원 차세대전지소재연구센터) | Sungho Choi
• 심광보(한양대학교 신소재공학과) | Kwang Bo Shim
• 정하균(한국화학연구원 차세대전지소재연구센터, 한국과학기술대학교대학원 화학융합소재학과) | Ha-Kyun Jung Corresponding author