Clear coating for light emitting device exterior having chemical resistance and related methods
AssigneeCreeLED, Inc.
InventorsAaron James Francis, Michael J. Bergmann
Life of this patent
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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 disposed over 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.
Claims22
An LED device comprising:
- one or more LED chips;
- an encapsulant material or lens disposed over at least a portion of the one or more LED chips;
- and
- a barrier coating at least partially disposed over the encapsulant or lens, wherein the barrier coating comprises a polyacrylate-silicon containing material, a polymethylacrylate-silicon containing material, or mixtures thereof represented by Formula (1):
- where R is methyl or ethyl or a C3-C6 straight or branched alkyl;
- each R1 is, independently, hydrogen, hydroxyl, alkyl, phenyl, or vinyl, with the proviso that at least one R1 is hydrogen, hydroxyl, or vinyl;
- R2 and R3 are, independently, hydrogen, methyl, or ethyl;
- and x and y represent molar amounts of monomer, where 0<x+y≤1, and y>0 arranged as a block co-polymer, a random copolymer, a graft copolymer, or a silane end-terminated polymer.
A method of reducing or preventing corrosion of corrodible metal components of an LED device, the method comprising:
- applying a barrier coating to at least a portion of an encapsulant or lens of an LED device, the LED device having at least one corrodible metal portion, wherein the barrier coating comprises a polyacrylate-silicon containing material, a polymethylacrylate-silicon containing material, or mixtures thereof represented by Formula (1):
- where R is methyl or ethyl or a C3-C6 straight or branched alkyl;
- each R1 is, independently, hydrogen, hydroxyl, alkyl, phenyl, or vinyl, with the proviso that at least one R1 is hydrogen, hydroxyl, or vinyl;
- R2 and R3 are, independently, hydrogen, methyl, or ethyl;
- and x and y represent molar amounts of monomer, where 0<x+y≤1, and y>0 arranged as a block co-polymer, a random copolymer, a graft copolymer, or a silane end-terminated polymer;
- and
- reducing or preventing permeation of one or more chemicals capable of corroding the at least one corrodible metal portion.
Dependencies are inferred from the claim text.