Light-emitting device

Details Light-emitting device Light-emitting device

2007-08-07

2007-08-07

Jackson, Jerome (Department: 2815)

Active solid-state devices (e.g., transistors, solid-state diode

Incoherent light emitter structure

Encapsulated

C257S095000, C257S096000, C257S081000, C257S099000, C257S079000, C257SE33059, C313S498000, C313S502000, C313S512000

Reexamination Certificate

active

10926342

ABSTRACT:
A foam-holding body52having a large difference in refractive index between foams521and the surrounding material is disposed on the major light extraction surface of the sapphire substrate50. The foam-holding body52has translucency to light of a light-emitting wavelength and is formed of a material such as a silicone or the like, having a refractive index equal to or more than 1.77, and includes a foam-holding layer holding a plurality of foams made of an air or an inactive gas having a refractive index of about one. Therefore, when the light emitted in the light-emitting portion scatters in the foam-holding body52, the spread of the scattered light becomes wide, which restricts repetition of the total reflection in the light-emitting device to improve an efficiency of the light extraction.

REFERENCES:
patent: 6777871 (2004-08-01), Duggal et al.
patent: 7023022 (2006-04-01), Eliashevich et al.
patent: 2002/0084745 (2002-07-01), Wang et al.
patent: 2006/0022356 (2006-02-01), Uwada et al.
patent: 2002-319708 (2002-10-01), None

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