고상반응법에 의한 LiBaPO4:Eu2+ 계 형광체의 제조 및 광 발광 특성
Preparation and Photoluminescence Properties of LiBaPO4:Eu2+ Phosphors by Solid State Reaction Method
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초록
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. 1,100oC에서 낮은 농도의 유로피움이 도핑된 조성의 결정구조는 삼방정(trigonal) 구조에 속하는 반면, 4 mol% Eu2+ 이상의 조성에서는 단사정(monoclinic) 계를나타내었다. 4 mol% 이상의 Eu2+이 첨가된 비화학양론적 조성에서는 단일상의 LiBaPO4가 형성되었다. 단일상의LiBaPO4:Eu2+ 계 형광체는 480nm에서의 청록색 발광스펙트럼을 나타내었다.
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 900oC, 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 1,000oC 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.
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