재생 형광체를 이용한 백색 LED 응용 시스템의 적용에 관한 연구

국문 초록 (Abstract)

재생공정 과정으로 얻은 형광체가 정상적인 것과의 비교 특성에서 동일한 결과를 얻는 것을 목표로 하였다. 재생 형광체 공정으로 얻은 칩이 정상의 것과 동일한 특성을 얻어 LED 칩 제조의 원가 절감에 큰 기여를 할 것으로 기대된다. 현재 여러 분야에서 LED단가를 낮추려는 시도가 많다. 본 연구의 목표는 LED 시스템 제조의 원가 절감에 기여할 수 있는 형광체 재생공정 개발을 통한 재생 형광체가 정상의 것과 동일한 특성을 갖는지의 여부이다. 현재 확실한 특성비교의 논문이 없는 실정으로 개발된 재생 공정을 통하여 재생된 형광체를 이용하여 칩을 제조하여 정상의 것과 비교 분석하였다. 광량, SEM을 이용한 입자의 특성, x-ray를 이용한 성분, x-y 색좌표 등의 분석 결과, 정상의 것과 동일한 특성을 보였다. 폐형광체에서 얻은 재생 형광체가 정상적인 것과의 비교에서 오차 범위 내에서 동일한 특성이 얻어진 특성 결과를 바탕으로 재생형광체를 사용한 백색 LED 칩을 응용제품에 적용하여 그 특성을 비교하였다. 응용제품으로는 국내 생산 손전등에 장착하여 그 특성을 조사하였는데, 재생과 정상 형광체의 특성에서 광량 저하량 3.2[cd]와 3.6[cd], 색감 저하량 57[K]와 58[K]을 보였고, 최대 백색파장 444.3[nm]와 449.8[nm]를 보이는 등 재생 형광체의 LED가 오차 범위 내에서 동일한 특성을 보였다.
LED를 측정하여 모든 평가를 진행한 결과 재활용 형광체가 정상형광체와 비교해 외관, 성분, 특성을 동등하게 유지하고 있는것을 확인할수 있다. 여러 경로를 통해 버려지는 형광체를 재활용하는 기술을 실제 생산현장에서 사용한다면 고가의 형광체의 폐기량을 낮춰 패키징의 원가절감, 나아가 모듈, 조명제품의 원가경쟁력에 큰 기여를 할것으로 판단된다.

목차 (Table of Contents)

• Ⅰ. 서 론 ································································ (6)
• Ⅱ. 연구배경 ····························································· (9)
• 2-1. 연구의 중요성 ···················································· (9)
• 2-1-1 LED 산업의 중요성 ·········································· (9)
• 2-1-2 LED 조명 산업의 시장 전망 및 기술 동향················· (19)
• 2-2. 연구의 필요성 ···················································· (27)
• 2-2-1 기술개발의 필요성 ············································ (27)
• 2-2-2. 기술 현황 ····················································· (28)
• III. 폐형광체의 재생공정 ················································ (32)
• 3-1. LED PKG의 기본 구조 및 폐형광체의 재생 과정············· (32)
• 3-1-1. LED PKG 구조 설명········································· (32)
• 3-1-2. 폐형광체의 재생 공정 흐름··································· (32)
• IV. 실험 및 평가
• 4-1. 폐형광체 적용 PKG의 성능 분석 ································ (35)
• 4-1-1. SEM(입자 측정) ·············································· (35)
• 4-1-2. X - Ray (성분 분석)·········································· (36)
• 4-1-3. 색좌표 산포 형성군············································ (37)
• 4-1-4. 광량 비교 ······················································· (39)
• 4-1-5. Satulation 비교··················································· (40)
• 4-1-6 광량 Degradation 비교··········································· (41)
• 4-1-7 색좌표 Degradation 비교······································· (42)
• 4-1-8 cx, cy좌표 비교·················································· (43)
• 4-1-9 재생과 정상형광체의 파장분석································· (44)
• 4-1-10. 재생과 정상형광체의 지향각 분석··························· (45)
• 4-1-11. 재생과 정상형광체의 신뢰성 실험··························· (46)
• 4-1-12. 재생과 정상형광체로 제작한 LED 손전등 특성실험
• ······································································(50)
• V. 결 론 ·································································· (52)
• 참고문헌 ··································································· (54)
• ABSTRACT ······························································ (55)