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Broadband Dielectric Reflectors for LEDs

A dielectric and reflectivity technology, applied in circuits, electrical components, semiconductor devices, etc., can solve problems such as how to deal with broadband white light absorption/reflection and electrical insulation, etc.

Inactive Publication Date: 2018-03-09
VIAVI SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] U.S. Pat. No. 6,833,565 issued Dec. 21, 2004 to Su et al. discloses the use of narrowband dielectric reflectors to reflect specific wavelengths of light emitted by LEDs back through the phosphor material to maximize wavelength conversion; however , without mentioning how to deal with broadband, white light absorption / reflection, and electrical isolation

Method used

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  • Broadband Dielectric Reflectors for LEDs
  • Broadband Dielectric Reflectors for LEDs
  • Broadband Dielectric Reflectors for LEDs

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Embodiment Construction

[0030] refer to figure 2 , the present invention relates to a broadband (eg white) light emitting diode (LED) device generally designated 11 comprising a broadband reflective The substrate 12 is formed of a material such as aluminum. One or more LED chips 13 (eg blue LEDs made of InGaN) are mounted on a substrate 12 for generating light in a first narrowband wavelength range (eg 50 nm), typically in the blue or ultraviolet (UV) range of light. An electrical circuit 14, preferably in the form of conductive traces patterned in a conductive oxide layer such as indium tin oxide, is formed around the LED 13 and is electrically connected to an external power and control source to provide power to the LED 13 and other control and monitoring functions.

[0031] In a preferred embodiment, LED 13 and circuitry 14 are encapsulated in a transparent encapsulant material 16 (eg, silicone) that protects LED 13 and circuitry 14 . Additionally, the encapsulant material provides insulation...

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Abstract

The present invention discloses a broadband omnidirectional multilayer dielectric reflector for LEDs in white light-emitting devices, which provides near 100% reflectivity in the entire visible spectrum of light and is used in substrates and for powering LEDs. And control the electrical insulation between the circuits of the LEDs. When an encapsulant material with a higher index of refraction than air is used to protect the LED and accompanying circuitry, an aluminum reflector layer or substrate is provided to compensate for the loss of reflectivity at certain angles of incidence.

Description

technical field [0001] The present invention relates to total dielectric reflectors for light emitting diodes (LEDs), and in particular to broadband omnidirectional multilayer total dielectric reflectors providing reflectivity and electrical isolation for LEDs in white light emitting devices. Background technique [0002] Conventional white light-emitting devices, such as disclosed in US Patent Application 2011 / 0186874 published on August 4, 2011 in the name of Shum and published in figure 1 Light emitting devices such as those shown in , include a blue or ultraviolet (UV) emitting LED 1 mounted on or surrounded by a circuit 2 that provides an electrical connection to an external power source to power the LED 1 . A metallic reflective layer 3 (eg silver) is provided on the silicon substrate 4 for reflecting any stray light refracted or reflected by the LED package back in a desired direction. Therefore, the insulating layer 6 is also required to provide electrical insulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/60
CPCH01L33/46H01L33/60H01L33/642H01L33/48H01L33/50
Inventor 乔治·J·欧肯法斯小理查德·A·布拉德利
Owner VIAVI SOLUTIONS INC