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분무열분해법에 의해 제조된 구형의 녹색 LaPO4:Tb 형광체의 발광특성

Photoluminescence Characteristics of Spherical-Shaped LaPO4:Tb Phosphor Particles Prepared by Spray Pyrolysis

  • 이교광 (한국화학연구원 화학소재부) ;
  • 강윤찬 (한국화학연구원 화학소재부) ;
  • 전일운 (한국화학연구원 화학소재부) ;
  • 정경열 (한국화학연구원 화학소재부) ;
  • 박희동 (한국화학연구원 화학소재부)
  • Lee, Kyo-Kwang (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Kang, Yun-Chan (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Zeon, Il-Woon (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Jung, Kyeong-Youl (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Park, Hee-Dong (Advanced Materials Division, Korea Research Institute of Chemical Technology)
  • 발행 : 2002.09.01

초록

Fine $LaPO_4$:Tb phosphor particles with spherical shape were prepared by spray pyrolysis. The influence of the precursor type of phosphorous such as ($NH_4$)$_2$$HPO_4$, $NH_4$$H_2$$PO_4$, ($NH_4$)$_3$$PO_4$ and $H_3$$PO_4$ on the morphology and brightness of particles was investigated. As-prepared particles by spray pyrolysis had spherical shape when ($NH_4$)$_2$ $HPO_4$ and $NH_4$$H_2$$PO_4$ were used as the precursor of phosphorous. The precursor type of phosphorous affected the photoluminescence intensity of $LaPO_4$:Tb phosphor particles, but not significant. With changing the content of activator(Tb) and excess of phosphorous, the optimal composition giving the highest photoluminescence intensity was found. The spherical morphology of prepared $LaPO_4$:Tb particles was completely maintained even after the posttreatment up to $1050^{\circ}C$. When the posttreatment temperature was over $1100^{\circ}C$, the particles did not have the spherical shape anymore. However, the highest photoluminescence intensity of prepared $LaPO_4$:Tb particles was obtained at $1050^{\circ}C$. The photoluminescence characteristics of prepared $_LaPO4$:Tb under the vacuum ultraviolet(VUV) illumination was comparable with that of the commercial $Zn_2$$V_4$:Mn and (La,Ce)PO$_4$:Tb phosphor particles. At the optimal condition, the decay time of prepared spherical $LaPO_4$:Tb phosphor particles was about 6.8ms.

키워드

참고문헌

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