Light-emitting device
A technology for light-emitting devices and light-emitting materials, applied in semiconductor devices, electrical components, circuits, etc., can solve the problems of light non-uniformity, difficult color point control, low efficiency, etc.
Inactive Publication Date: 2009-06-24
KONINK PHILIPS ELECTRONICS NV
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Problems solved by technology
[0010] An object of the present invention is to provide a light-emitting device that overcomes the above-mentioned defects of non-uniformity of light, low efficiency and / or difficulty in color point control
Method used
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[0039] 1 g of SiO coated 2 TiO 2 Nanoparticles were mixed with 5 grams of silica gel. A small amount of this material is applied to the LED by using dispensing. A LUMIRAMIC die is placed on the diffuser using a pick and place machine. After the silicone gel has cured, the dome is placed over the die and filled with (transparent) encapsulant. Optically bonded (i.e. coated with SiO 2 TiO 2 Diffusion of nanoparticles in silica gel) The thickness can be controlled by a pick-and-place machine. Excess material will flow out of the die, filling the space under the LUMIRAMIC plate (the amount is controlled by the amount dispensed).
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A light-emitting device (1) is disclosed, which comprises a radiation source (2), an inorganic layer (3) comprising a luminescent material (4); and a scattering layer (5) comprising scattering particles (6). The scattering layer (5) is located between the radiation source (2) and the inorganic layer (3), which is composed of a ceramic material.
Description
technical field [0001] The invention relates to a light emitting device comprising a radiation source, an inorganic layer comprising a luminescent material and a scattering layer comprising scattering particles. A scattering layer is located between the radiation source and the inorganic layer. Background technique [0002] White light can eg be obtained by partial conversion of blue light sources such as LEDs (Light Emitting Diodes) with yellow phosphors. Blue light emitted by the LED excites the phosphor so that it emits yellow light. The blue light emitted by the LED mixes with the yellow light emitted by the phosphor, and the observer perceives the mixture of blue and yellow light as white light. [0003] The LED emits blue light anisotropically, ie the light is direction dependent, and the phosphor emits isotropically, ie in all directions. In mixed light, the anisotropic light combined with the isotropic emission pattern results in a non-uniform distribution that ty...
Claims
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IPC IPC(8): H01L33/00H01L33/44H01L33/50
CPCH01L33/507H01L2933/0091H01L33/44
Inventor M·P·J·皮特斯R·J·亨德里克斯A·L·韦杰斯C·穆特
Owner KONINK PHILIPS ELECTRONICS NV