Side emitting device with hybrid top reflector
View Patent ↗A side-emitting light emitting device ( 100 ) is provided, comprising at least one light emitting diode ( 101 ) arranged on a substrate ( 102 ) and facing a scattering reflector ( 103, 109 ) disposed at a distance from and extending along the extension of said substrate. The scattering reflector comprises scattering components ( 110 ) distributed in a carrier ( 108 ), and the scattering components have a refractive index being different from the refractive index of said carrier. The scattering action of the reflector gives rise to an angular redistribution in the device, which increases the chance of light exiting the device through lateral openings between the reflector and the substrate, while light is essentially prevented from being emitted through the top surface.
1. A side-emitting light emitting device, comprising at least one light emitting diode arranged on a substrate and facing a scattering reflector disposed at a distance from and extending along an extension of said substrate,
wherein said scattering reflector comprises scattering components distributed in a carrier, the scattering components having a refractive index different from the refractive index of said carrier, said scattering components comprising a plurality of pores having a refractive index lower than the refractive index of said carrier.
2. A light emitting device according to claim 1 , wherein said scattering components constitute from 10 to 70% by volume of said scattering reflector.
3. A light emitting device according to claim 1 , wherein said carrier comprises a silicon-comprising network.
4. A light emitting device according to claim 3 , wherein said silicon-comprising network is a silicate network or a polysiloxane network.
5. A light emitting device according to claim 1 , wherein said carrier comprises a ceramic material.
6. A light emitting device according to claim 1 , wherein said scattering reflector has a reflectivity of above 90%.
7. A light emitting device according to claim 1 , wherein a top reflector is arranged on top of said scattering reflector.
8. A light emitting device according to claim 1 , wherein a solid transmissive material is arranged between said substrate and said scattering reflector.
9. A light emitting device according to claim 1 wherein said solid transmissive material comprises a wavelength converting material.
10. A light emitting device according to claim 1 , wherein said scattering reflector comprises a pigment.
11. A light emitting device according to claim 1 , wherein said scattering reflector is arranged parallel to said substrate.
12. A light emitting device according to claim 1 , wherein part of the lateral edges of said solid transmissive material is coated by a reflective coating.