IPC분류정보
국가/구분 |
United States(US) Patent
공개
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0517284
(2007-11-30)
|
공개번호 |
US-0059777
(2010-03-11)
|
우선권정보 |
EP-06125458.7(2006-12-05) |
국제출원번호 |
PCT/IB2007/054858
(2007-11-30)
|
발명자
/ 주소 |
- Bechtel, Hans-Helmut
- Busselt, Wolfgang
- Schmidt, Peter J.
- Meyer, Joerg
|
출원인 / 주소 |
- KONINKLIJKE PHILIPS ELECTRONICS N.V.
|
대리인 / 주소 |
PHILIPS INTELLECTUAL PROPERTY & STANDARDS
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
0 |
초록
▼
The invention relates to an illumination device (10) that comprises an active layer (11), for example a blue LED, covered with a first luminescent ceramic converter layer (12) and partially covered with a second luminescent ceramic converter layer (13). The first and second conversion layers (12, 13
The invention relates to an illumination device (10) that comprises an active layer (11), for example a blue LED, covered with a first luminescent ceramic converter layer (12) and partially covered with a second luminescent ceramic converter layer (13). The first and second conversion layers (12, 13) convert primary photons (λp) emitted by the active layer (11) into photons of different, longer wavelengths (λ1, λ2), wherein the color point of the illumination device (10) can be adjusted by adjusting the relative size of the second conversion layer (13).
대표청구항
▼
1. An illumination device (10), comprising an active layer (11) for emitting primary photons (λp); a first conversion layer (12) for converting primary photons to photons of a longer first wavelength (λ1), a second conversion layer (13) for converting primary photons and/or photons of a
1. An illumination device (10), comprising an active layer (11) for emitting primary photons (λp); a first conversion layer (12) for converting primary photons to photons of a longer first wavelength (λ1), a second conversion layer (13) for converting primary photons and/or photons of a first wavelength (λ1) to photons of a second wavelength (λ2) that is different from the first wavelength (λ1), wherein a part of the primary photons can leave the illumination device (10) without passing through the second conversion layer (13). 2. The illumination device (10) according to claim 1, characterized in that the first conversion layer (12) comprises a luminescent ceramics. 3. The illumination device (10) according to claim 1, characterized in that the second conversion layer (13) comprises a luminescent ceramics. 4. The illumination device (10) according to claim 1, characterized in that the first and/or second conversion layer (12, 13) comprises a material selected from the group consisting of Y3Al5O12:Ce (YAG:Ce), Ca—SiAlON:Eu, Ca—SiAlON:Ce, CaS:Eu, SrS:Eu, BaS:Eu, Ca2SiO4:Eu, Ba2SiO4:Eu, Sr2SiO4:Eu, Ca2Si5N8:Eu, Ba2Si5N8:Eu, Sr2Si5N8:Eu, SrSi2O2N2:Eu including their solid solutions with one or more suitable substituent elements, particularly (Y,Gd)3Al5O12:Ce or (Ca,Mg,Sr)(Al,B,Ga)SiN3:Eu including exchange of isosterical subunits, particularly AlO+ for SiN+. 5. The illumination device (10) according to claim 1, characterized in that the Eu-content n is within the range of 0<n<0.002 6. The illumination device (10) according to claim 1, characterized in that the active layer (11) comprises a light emitting diode. 7. The illumination device (10) according to claim 1, characterized in that substantially all primary photons have a wavelength (λp) smaller than 500 nm. 8. The illumination device (10) according to claim 1, characterized in that it has an emission spectrum of white light with a Correlated Color Temperature smaller than 5000 K. 9. The illumination device (10) according to claim 1, characterized in that the first conversion layer (12) covers completely the emission surface of the active layer (11). 10. The illumination device (10) according to claim 1, characterized in that the second conversion layer (13) covers a part of preferably 10% to 90%, most preferably 20% to 30%, of the emission surface of the first conversion layer (12) and/or of the active layer (11). 11. The illumination device (10) according to claim 1, characterized in that the emission wavelength (λ2) of the second conversion layer (13) is longer than the emission wavelength (λ1) of the first conversion layer (12).
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