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Clear coating for light emitting device exterior having chemical resistance and related methods

A technology for coatings and devices, applied in chemically resistant transparent coatings for the exterior of light-emitting devices and related fields, capable of solving problems affecting device performance, harmfulness, and reduced connectivity

Pending Publication Date: 2019-08-27
CREELED INC (N D GES D STAATES DELAWARE NEWARK)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This degradation can deleteriously affect the brightness, reliability, and / or thermal performance of conventional LED devices over time, and can further deleteriously affect the performance of the devices during operation.
For example, the main failure mechanism of LEDs is a change in the forward voltage in the component, which is caused by an increase in internal resistance, for example, a decrease in the connectivity between the wire bond and the mounting surface caused by chemical corrosion

Method used

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  • Clear coating for light emitting device exterior having chemical resistance and related methods
  • Clear coating for light emitting device exterior having chemical resistance and related methods
  • Clear coating for light emitting device exterior having chemical resistance and related methods

Examples

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Embodiment Construction

[0042] Diffusion of gas or liquid through the encapsulant or encapsulant (e.g. polymer lead frame - front or back side of PCB) into the LED component causing corrosion of corrodible metals (e.g. silver, aluminum, copper) and Degradation of moisture sensitive materials (eg, certain phosphors). To address this issue, the present disclosure provides barrier coatings and barrier coating application processes suitable for LED lamps, ceramic or polymer packages, and ceramic or polymer lead frames.

[0043] Silver (Ag) is an excellent reflective material, and there remains a need to reduce or prevent unwanted chemicals and / or chemical vapors from reaching and subsequently degrading the Ag metal components within LED packages and LED devices, thereby allowing the use of Ag as a and / or reflector materials for high brightness applications. The barrier coatings and methods described herein provide ease of fabrication and improve device reliability and performance of LED packages and LED...

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Abstract

Light emitting devices and components having excellent chemical resistance and related methods are disclosed. In one embodiment, an LED device or package with an encapsulant material or lens disposedover at least a portion of the LED device or package and a poly(methyl) acrylate-silicon containing barrier coating at least partially disposed over the encapsulant or the lens provides corrosion protection to corrodible metals and / or moisture protection to moisture sensitive components.

Description

technical field [0001] The subject matter herein relates generally to light emitting devices, components and methods. More specifically, the subject matter herein relates to coatings, components, methods and devices provided therefrom having improved chemical resistance to chemical vapors or gases that, for light-emitting devices, can adversely affect Brightness and reliability of such devices for light emitting devices. Background technique [0002] Light emitting diodes (LEDs) can be used in light emitting devices or packages to provide white light. Conventional LED devices or packages may contain components such as metal traces or mounting surfaces that, when exposed to various undesirable chemicals and / or chemical vapors, even when embedded or otherwise "encapsulated," may become rusted, corroded or otherwise deteriorated. Silver (Ag) is used in LED devices and packages because of its excellent reflectivity at visible wavelengths and relatively low cost. However, sil...

Claims

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Application Information

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IPC IPC(8): H01L33/48H01L33/56H01L25/075C09D143/04C09D133/08C09D133/10
CPCH01L33/48H01L33/56H01L25/0753C09D143/04C09D133/10C09D133/08H01L33/58H01L33/60H01L33/502H01L2933/005C09D5/08
Inventor A·J·弗朗西斯M·J·伯格曼
Owner CREELED INC (N D GES D STAATES DELAWARE NEWARK)