Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Fine Size YAG:Tb Phosphor Particles Prepared by Spray Pyrolysis

분무 열분해 공정에 의해 합성된 미세 YAG:Tb 형광체

  • Lee, Hyo Jin (Department of Chemical Engineering, Konkuk University) ;
  • Hong, Seung Kwon (Department of Chemical Engineering, Konkuk University) ;
  • Jung, Dae Soo (Department of Chemical Engineering, Konkuk University) ;
  • Kang, Yun Chan (Department of Chemical Engineering, Konkuk University) ;
  • Jung, Kyeong Youl (Advanced Materials Division, Korea Research Institute of Chemical Technology)
  • 이효진 (건국대학교 화학공학과) ;
  • 홍승권 (건국대학교 화학공학과) ;
  • 정대수 (건국대학교 화학공학과) ;
  • 강윤찬 (건국대학교 화학공학과) ;
  • 정경열 (한국화학연구원 화학소재부)
  • Received : 2005.01.18
  • Accepted : 2005.04.01
  • Published : 2005.06.30
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Abstract

YAG:Tb($Y_3Al_5O_{12}:Tb$) phosphor particles were prepared by spray pyrolysis from spray solution containing various types of flux materials. The effects of type of flux, organic material and post-treatment temperature on the characteristics of morphology, crystallinity and photoluminescence of YAG:Tb phosphor particles were investigated. Citric acid and ethylene glycol used as organic additive improved the photoluminescence intensity of the YAG:Tb phosphor particles without destruction of the morphology after post-treatment at high temperature. However, the spherical shape of the precursor particles obtained by spray pyrolysis from spray solution containing high amount of flux material disappeared after post-treatment at $1300^{\circ}C$. YAG:Tb phosphor particles prepared from spray solution containing lithium carbonate flux had fine size and regular morphology after post-treatment. Lithium carbonate used as flux material was also efficient in improvement of the photoluminescence intensity of the YAG:Tb phosphor particles. The optimum photoluminescence intensity of the YAG:Tb phosphor particles prepared from spray solution containing lithium carbonate flux was 189％ of that of the phosphor particles prepared from spray solution without flux material.

분무용액에 다양한 융제들을 도입하여 분무열분해법에 의해 YAG:Tb($Y_3Al_5O_{12}:Tb$) 형광체들을 합성하였다. 융제의 종류, 유기 첨가물 및 후열처리 온도 등이 YAG:Tb 형광체의 형태, 결정성 및 발광 특성에 미치는 영향 등을 조사하였다. 유기첨가물로 사용된 구연산과 에틸렌 글리콜은 고온의 열처리 과정에서 YAG:Tb 형광체의 형태 파괴 없이 발광 특성을 증대시켰다. 반면에 다량의 융제를 포함한 분무용액으로부터 분무열분해 공정에 의해 합성된 전구체 분말은 $1300^{\circ}C$에서의 후열처리 후에 구형의 형태가 사라졌다. 리튬 탄산염을 융제로 함유한 분무용액으로부터 합성된 YAG:Tb 형광체는 후열처리 후에 미세하면서도 균일한 형태를 가졌다. 융제로서 사용된 리튬 탄산염은 YAG:Tb 형광체의 발광 휘도 개선에도 효과적이었다. 리튬 탄산염을 융제로 첨가한 경우에 합성된 YAG:Tb 형광체의 최적의 발광 세기는 융제를 첨가하지 않은 경우에 합성된 형광체의 발광세기의 189％였다.

Keywords

References

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