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Light emitting device with a at least one ceramic spherical color converter material

A light-emitting device and color conversion technology, applied in the direction of light-emitting materials, semiconductor devices, electrical components, etc., can solve complex problems and achieve the effects of precise deposition control, excellent chromaticity control, and excellent light conversion

Active Publication Date: 2015-09-02
LUMILEDS HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the manufacture of state-of-the-art LEDs involves complex technologies, and this is especially true for the application of color converter materials

Method used

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  • Light emitting device with a at least one ceramic spherical color converter material
  • Light emitting device with a at least one ceramic spherical color converter material
  • Light emitting device with a at least one ceramic spherical color converter material

Examples

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example I

[0121] Al was milled in isopropanol using high-purity alumina milling media (Nikkato, SSA-W 999) 2 o 3 (99.99%, average particle size 350nm), Y 2 o 3 (99.99%, average particle size 700nm) and CeO 2 (>98.5%, average particle size 40nm). After addition of polyvinyl butyral binder (Sekisui, BM-S), the powder suspension was dried and granulated to form granules with particle diameters in the range of 80-120 μm. The particles were then cold pressed into beads with an average diameter of 800 μm and debonded at 500° C. in air.

[0122] These beads are then coated with a water-impermeable polyethylene coating. The polyethylene coating is applied by means of bed coating at temperatures in the range 200-400°C, alternatively electrostatic spraying or flock spraying may be used.

[0123] The coated beads were then cold isostatically pressed at a pressure in the range of 2000-4500 bar. After cold isostatic pressing, residual organic binders and coatings were removed by baking the be...

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Abstract

The invention relates to a light emitting device comprising at least one light source and at least one ceramic spherical color converter material, which helps to ease the manufacture as well as to improve the luminescence properties of the light emitting device.

Description

technical field [0001] The invention is directed to the field of light emitting devices, especially LEDs. Background technique [0002] Phosphors including silicates, phosphates (such as apatite) and aluminates as host materials, with transition metals or rare earth metals added as active materials as host materials are widely known. As blue LEDs in particular have become practical in recent years, the development of white light-emitting devices using such blue LEDs in combination with such phosphor materials is being vigorously pursued. Since white light-emitting devices using LEDs as light sources are expected to have lower power consumption and longer lifespan than existing white light sources, development is moving toward their use in backlights for liquid crystal panels, indoor and outdoor lighting fixtures, and backlights for automotive panels. Sources, automotive headlights and signal light sources, light sources in projection devices, etc. [0003] However, the man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50
CPCC04B2235/663C04B2235/5454C04B35/44C04B35/6261C04B35/634C04B2235/3225C09K11/0883C04B35/638C04B35/62655C04B35/62695C04B2235/5427C01B21/0826C01B17/42C04B35/6455C04B2235/3217C04B2235/658C09K11/7774C04B2235/3229C04B2235/604C04B2235/5445C04B2235/764H01L33/502C04B2235/5436C01P2002/54C09K11/7734C01P2002/50C01F17/0025H01L2933/0041C01F17/34H01L33/50C09K11/08
Inventor P.施米特H.-H.贝克特尔
Owner LUMILEDS HLDG BV