| 학회 |
한국재료학회 |
| 학술대회 |
2005년 가을 (11/10 ~ 11/11, 한양대학교) |
| 권호 |
11권 2호 |
| 발표분야 |
전자재료 |
| 제목 |
2가지 형광체를 혼합한 백색 LEDs |
| 초록 |
White light emitting LEDs are used as a backlight in liquid crystal displays and as a replacement for small conventional lamp and fluorescent lamps. We have synthesized an Eu2+-activated SrGa2S4 green phosphor and SrS red phosphor investigated an attempt to develop white LEDs by combining it with a InGaN blue LED chip(λem=460 nm). Three distinct emission bands from the InGaN-based LED and the (SrGa2S4:Eu + SrS:Eu) phosphor are clearly observed at 460nm, 540 nm and at around 610 nm, respectively. These three emission bands combine to give a spectrum that appears white to the naked eye. Our results show that InGaN (460 nm chip)-based (SrGa2S4:Eu + SrS:Eu)exhibits a better luminous efficiency than that of the industrially available product InGaN (460 nm chip)-based YAG:Ce. A human observer perceives the combination of the blue, green, red phosphor emissions as white light.
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| 저자 |
최경재1, 박정규2, 김경남2, 김창해2, 김호건1
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| 소속 |
1한양대, 2한국화학(연) |
| 키워드 |
LED(Light Emitting Diode); phosphors; YAG; InGaN
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| E-Mail |
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