The Journal of Korean Institute of Information Technology (한국정보기술학회논문지)

Korean Institute of Information Technology (한국정보기술학회)
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Process Development for Reproduction of Derelict Phosphors in the Manufacture of White LED Chip

백색 LED 칩 제조의 폐 형광체 재생 공정 개발

  • Published : 2013.05.31
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Abstract

LEDs are using widely in a field of illumination because they have several merits, such as low power consumption, long lifetime, high brightness, fast response, environment friendly. Especially, White LED will be applied greatly as a lighting system. To make white LED chip, one need mixture with silicon and liniment of phosphor on LED blue chip. In case of mixture with silicon using phosphor, It is thrown away phosphor in chip process. Saving costs of chip depends on many factors, including the mixture errors, exposure over time of silicon, characteristics changes of blue chip. In this study, we have reported that the reproduction process of derelict phosphor was developed. It was showed that derelict phosphor chip indicated the same results compared to normal white chip for the intensity of illumination, particle size, component and x-y chromaticity.

LED는 저 전력, 긴 수명, 고 휘도, 빠른 응답, 친환경적인 특성의 장점을 갖고 있어 여러 분야에 사용되고 있는데, 특히 백색 LED는 각종 조명등의 응용 시스템에 크게 사용될 것으로 보인다. 백색 LED 칩을 만들기 위하여는 실리콘과 형광체를 배합하여 청색 LED 칩 위에 도포하는 공정이 필요한데, 이 형광체의 가격 경쟁력이 중요한 요소가 되고 있다. 이때 배합의 오류, 실리콘의 상온 노출 시간의 경과, 청색 칩 특성의 변화 등으로 버려지는 형광체가 있어 이것이 원가 절감에 악영향을 미치고 있다. 본 연구에서는 버려지는 형광체의 재생 공정을 개발하여 그 특성을 조사하였다. 특성에서는 정상적인 형광체와 동일한 특성을 보여 원가절감에 큰 기여를 할 것으로 나타났다.

Keywords

References

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