Journal of the Microelectronics and Packaging Society (마이크로전자및패키징학회지)

The Korean Microelectronics and Packaging Society (한국마이크로전자및패키징학회)
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Preparation and Photoluminescence Properties of LiBaPO4:Eu2+ Phosphors by Solid State Reaction Method

고상반응법에 의한 LiBaPO4:Eu2+ 계 형광체의 제조 및 광 발광 특성

  • Park, In Yong (Department of Materials Science and Engineering, Hanbat National University)
  • Received : 2019.12.03
  • Accepted : 2019.12.22
  • Published : 2019.12.30
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Abstract

LiBaPO4:Eu2+ phosphors with stoichiometric and nonstoichiometric compositions were prepared using a solid state reaction followed by heat treatment in reduced atmosphere, and the crystal structures and photoluminescence(PL) properties of the powders were investigated by x-ray powder diffraction and luminescence spectrometer. At 900℃, the Ba3(PO4)2 phase as the intermediate phase was observed with the LiBaPO4 phase as the main crystalline phase. Samples with a low europium concentration at 1,000℃ belonged to the trigonal structure, whereas samples with Eu2+ content more than 4 mol% showed monoclinic structure. In the nonstoichiometric compositions of 4 mol% Eu2+ and above, a single phase of Eu2+-doped LiBaPO4, showing bluish green emission, was formed.

화학양론적 조성과 비화학양론적 조성을 갖는 LiBaPO4:Eu2+ 계 형광체를 고상반응으로 제조한 후 환원 분위기에서 열처리한 다음 분말의 결정구조와 광 특성을 X선 회절 분석과 발광 분석을 통하여 조사하였다. XRD 분석 결과, 900℃에서 중간상으로서 Ba3(PO4)2 상이 주 결정상 LiBaPO4와 함께 나타났다. 1,100℃에서 낮은 농도의 유로피움이 도핑된 조성의 결정구조는 삼방정(trigonal) 구조에 속하는 반면, 4 mol% Eu2+ 이상의 조성에서는 단사정(monoclinic) 계를 나타내었다. 4 mol% 이상의 Eu2+이 첨가된 비화학양론적 조성에서는 단일상의 LiBaPO4가 형성되었다. 단일상의 LiBaPO4:Eu2+ 계 형광체는 480nm에서의 청록색 발광스펙트럼을 나타내었다.

Keywords

References

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