고상법을 이용한 LED용 SrGa2S4:Eu 녹색 형광체의 합성 및 발광특성
Synthesis and Luminescence Characteristics of SrGa2S4:Eu Green Phosphor for Light Emitting Diodes by Solid-State Method
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초록
기존의 SrGa2S4:Eu2+녹색 발광 형광체는 주로 CRT (Cathode Ray Tube)용이나 FED (Field Emission Display), 그리고 EL (Electroluminescence)용 발광소자로 많이 연구되어졌다. 현재는 장파장 영역의 여기 특성을 이용 한 LED (Light Emitting Diode)용 형광체로 주목 되어지고 있다. SrGa2S4:Eu2+형광체의 일반적 합성 방법은 Flux를 이용하여 인체에 유해한 H2S나 CS2 기체를 사용할 뿐만 아니라 높은 합성온도, 긴 반응시간 및 공정이 복잡한 단점 을 지니고 있다. 따라서 본 실험은 황화물계 원료인 SrS, Ga2S3 그리고 EuS를 출발 물질로 하여 H2S 기체를 사용하지 않고 혼합 기체(5% H2/95% N2)를 사용해 환원 분위기 하에서 SrGa2S4:Eu2+을 합성하였다. 그리고 다양한 합성 조건 과 LED용으로 사용되기 위해 수세처리와 Sieving 과정을 거친 형광체의 발광특성을 검토하였다.
Abstract
The SrGa2S4:Eu2+ green emitting phosphor has been studied as a luminous device for CRT (Cathode Ray Tube) or FED (Field Emission Display) and EL (Electroluminescence). This phosphor, also, is under noticed for LED (Lighting Emitting Diode) phosphor, which makes use of excitation characteristics of long wavelength region. The SrGa2S4:Eu2+ phosphor was prepared generally conventional synthesis method using flux. However, this method needs high heat-treated temperature, long reaction time, complex process and harmful H2S or CS2 gas. In this works, therefore, we have synthesized SrGa2S4:Eu2+ using SrS, Ga2S3, and EuS as starting materials, and the mixture gas of 5% H2/95% N2 was used to avoid the H2S or CS2. We investigated the luminescence characteristic of SrGa2S4:Eu2+ phosphor prepared in various synthesis conditions, performed post-treatment and sieving process for application to LED.
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