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Synthesis and luminescence characteristics of nano-sized YAG : Ce phosphors by homogeneous precipitation method

Homogeneous precipitation method를 통한 나노 YAG : Ce 형광체 합성과 광학 특성

  • Lee, Chul Woo (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Kwon, Seok Bin (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Ji, Eun Kyung (SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University) ;
  • Song, Young Hyun (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Jeong, Byung Woo (LG Electronics, Material & Device Advanced Research Institute Advanced Optics Team) ;
  • Kim, Eun Young (LG Electronics, Material & Device Advanced Research Institute Advanced Optics Team) ;
  • Jung, Mong Kwon (Hyosung Corporation, R&D Business Labs) ;
  • Yoon, Dae-Ho (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 이철우 (성균관대학교 신소재공학과) ;
  • 권석빈 (성균관대학교 신소재공학과) ;
  • 지은경 (성균관대학교 성균나노과학기술원) ;
  • 송영현 (성균관대학교 신소재공학과) ;
  • 정병우 (LG전자 소재기술원) ;
  • 김은영 (LG전자 소재기술원) ;
  • 정몽권 (효성기술원) ;
  • 윤대호 (성균관대학교 신소재공학과)
  • Received : 2016.09.08
  • Accepted : 2017.01.06
  • Published : 2017.02.28

Abstract

In this study, spherical monodispersed cerium-doped yttrium aluminum garnet (YAG : $Ce^{3+}$) phosphor particles were synthesized via homogeneous precipitation method using the mixed solution of yttrium nitrate, cerium nitrate, aluminum nitrate, ammonium aluminum sulfate, and urea as a precipitant. During the process of precursors of monodispersed YAG : $Ce^{3+}$, aluminum ions which form spherical aluminum compounds precipitated first and yttrium compounds precipitated onto the surface of the existing spherical aluminum compounds. Drying process using lyophilization could obtain monodispered spherical YAG : $Ce^{3+}$ particles compare to using oven. The thermal calcination process of YAG : $Ce^{3+}$ precursors under the temperature of $1200^{\circ}C$ for 6 h was enough to obtain 400~500 nm sized YAG particles with pure YAG phase.

본 연구에서는 homogeneous precipitation method를 통하여 구형의 단분산(monodispersed) YAG : $Ce^{3+}$를 합성했다. 단분산 YAG : $Ce^{3+}$의 전구체를 합성하는 과정에서 aluminum ion들이 먼저 석출되어 aluminum 화합물을 형성하고 후에 yttrium 화합물들이 aluminum 화합물들의 표면에서 석출된다. 합성된 전구체를 파우더형태로 얻기 위해 건조과정을 거치는데, oven에서 건조했을 때 보다 동결건조기에서 건조했을 때 비교적 구형의 단분산 YAG : $Ce^{3+}$ 입자를 얻을 수 있었다. 하소 과정에서 공정을 진행하는 온도로서 $1100^{\circ}C$$1200^{\circ}C$를 비교해 보았다. 실험 결과 $1200^{\circ}C$의 온도로 상압에서 6시간 동안의 하소 과정을 진행하였을 때 400~500 nm 입자크기를 가진 단분산된 구형의 나노 YAG : $Ce^{3+}$ 입자가 합성되었다.

Keywords

References

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