스컬용융법에 의한 CaZrO₃ : Eu³⁺ 형광체 합성
Synthesis of CaZrO₃ : Eu³⁺ phosphor by skull melting method
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초록
단결정상을 가지는 CaZrO₃ : Eu³⁺형광체를 스컬용융법으로 합성하였다. 합성된 형광체의 결정구조, 형태 및 광학적 특성은 XRD, SEM, UV 형광반응 및 PL을 분석하였다. 출발 원료는 CaO : ZrO₂ : Eu₂O₃를 0.962 : 1.013 : 0.025 mol%로하여 냉각도가니에 충진하였다. 냉각도가니는 내부 직경 120mm, 높이 150 mm이며, 혼합된 파우더 3 kg은 3.4MHz의 출력주파수로 1시간 이내에 완전히 용융되어 2시간 동안 유지시킨 후 자연냉각 시켰다. XRD 측정에서는 다른 결정상은 측정되지 않았으며 페로브스카이트 구조의 정방정계로 분석되었다. 합성된 형광체는 UV 광에 의해 여기 될 수 있고 방출 스펙트럼 결과는 615 nm에서 자기 쌍극자 전이 ⁵D₀→⁷F₂로 인해 CaZrO₃ : Eu³⁺의 밝은 적색 발광이 우세하였다.
Abstract
Single crystal phased CaZrO3 : Eu3+ phosphor have been synthesized by skull melting method. The crystalstructure, morphology and optical properties of synthesized phosphor were investigated XRD (X-ray diffraction), SEM(scanning electron microscopy), UV (ultraviolet) fluorescence reaction and PL (photo luminescence). The starting materialshaving chemical composition of CaO: ZrO2 : Eu2O3= 0.962 : 1.013 : 0.025 mol% were charged into a cold crucible. The coldcrucible was 120 mm in inner diameter and 150 mm in inner height, and 3 kg of mixed powder (CaO, ZrO2 and Eu2O3)was completely melted within 1 hour at an oscillation frequency of 3.4 MHz, maintained in the molten state for 2 hours,and finally air-cooled. The XRD results show that synthesized phosphor is stabilized in orthorhombic perovskite structurewithout any impurity phases. The synthesized phosphor could be excited by UV light (254 or 365 nm) and the emissionspectra results indicated that bright red luminescence of CaZrO3 : Eu3+ due to magnetic dipole transition ⁵D₀→⁷F₂ at 615nm was dominant.
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