Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis of K2TiF6:Mn4+ Red Phosphors by a Simple Method and Their Photoluminescence Properties

Mn4+ 이온 활성 K2TiF6 불화물 적색형광체의 합성과 발광특성

  • Kim, Yeon (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Wu, Mihye (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Choi, Sungho (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Shim, Kwang Bo (Division of Materials Science and Engineering, Hanyang University) ;
  • Jung, Ha-Kyun (Advanced Materials Division, Korea Research Institute of Chemical Technology)
  • 김연 (한국화학연구원 차세대전지소재연구센터) ;
  • 우미혜 (한국화학연구원 차세대전지소재연구센터) ;
  • 최성호 (한국화학연구원 차세대전지소재연구센터) ;
  • 심광보 (한양대학교 신소재공학과) ;
  • 정하균 (한국화학연구원 차세대전지소재연구센터)
  • Received : 2016.05.18
  • Accepted : 2016.08.30
  • Published : 2016.09.27
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Abstract

To prepare $Mn^{4+}$-activated $K_2TiF_6$ phosphor, a precipitation method without using hydrofluoric acid (HF) was designed. In the synthetic reaction, to prevent the decomposition of $K_2MnF_6$, which is used as a source of $Mn^{4+}$ activator, $NH_5F_2$ solution was adopted in place of the HF solution. Single phase $K_2TiF_6$:$Mn^{4+}$ 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 $Mn^{4+}$ 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 $K_2TiF_6$:$Mn^{4+}$ phosphor with a 450 nm blue-LED chip was measured.

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