La2O3-CaF2-Al2O3-SiO2 계 oxy-fluoride 결정화 유리의 광 발광 특성
Photoluminescence properties of oxy-fluoride glass-ceramics of La2O3-CaF2-Al2O3-SiO2 system
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초록
레이저, 광학센서 등에 사용되고 있는 La2O3-CaF2-Al2O3-SiO2 계 유리에 희토류 물질을 첨가하였을 때, 열처리온도에 따른 결정화유리의 발광 특성 변화에 대하여 연구하였다. 결정화유리를 얻기 위한 열처리 조건은 비등온 열분석을통해 얻었으며, 열처리 온도에 따른 결정성장 정도 및생성된 결정상 종류를 파악하기 위해 XRD 분석을 진행하였다. Scherrer’s equation을 이용한 결과, 결정화유리 내부에 25~40 nm 크기의 결정들이 생성된 것으로 계산되었다. Photoluminescence(PL) 분석결과, 660~670°C에서 1시간 열처리 된 시편이 가장 우수한 PL 강도를 보였으며, CIE색좌표계 분석결과, 열처리유무와 관계없이 모든 결정화유리 시편들은 red-orange 빛을 발광하는 것으로 나타났다.
Abstract
The change of the photoluminescence properties of La2O3-CaF2-Al2O3-SiO2 glass-ceramics doped with rare earth material, that is used as laser and optical sensors, was analyzed according to heat treatment temperature. The heat treatment conditions for fabricating glass-ceramics were obtained through non-isothermal thermal analysis, and X-ray diffraction analysis was performed to determine the degree of crystal growth and kinds of crystal phases generated according to the heat treatment temperature. Using Scherrer’s equation, it was predicted that crystals with a size of 25~40 nm would be generated inside the glass-ceramics. Photoluminescence (PL) analysis showed that the specimens heat-treated at 660°C to 670°C for 1 hour had the highest PL intensity. Also, from the CIE color coordinate analysis, all glass-ceramics specimens emitted red-orange light regardless of the heat treatment condition.
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