| 학회 |
한국재료학회 |
| 학술대회 |
2005년 봄 (05/26 ~ 05/27, 무주리조트) |
| 권호 |
11권 1호 |
| 발표분야 |
전자재료 |
| 제목 |
3가지 형광체를 혼합한 자외선 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 Sr3MgSi2O8 blue phosphor and Sr2SiO4 green phosphor and Ba2+ co-doped Sr3SiO5 red phosphor investigated an attempt to develop white LEDs by combining it with a GaN blue LED chip(λem=405 nm). Three distinct emission bands from the GaN-based LED and the (Sr3MgSi2O8:Eu + Sr2SiO4:Eu + Ba2+ co-doped Sr3SiO5:Eu) phosphor are clearly observed at 455nm, 520 nm and at around 600 nm, respectively. These three emission bands combine to give a spectrum that appears white to the naked eye. Our results show that GaN (405 nm chip)-based (Sr3MgSi2O8:Eu + Sr2SiO4:Eu + Ba2+ co-doped Sr3SiO5: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. |
| 저자 |
최경재1, 박정규1, 김경남1, 김창해1, 김호건2
|
| 소속 |
1한국화학(연), 2한양대 |
| 키워드 |
UV LED; Phosphor; CRI; CCT
|
| E-Mail |
|
