LIGHTING DEVICE INCLUDING MULTIPLE ENCAPSULANT MATERIAL LAYERS
First Claim
Patent Images
1. A lighting device comprising:
- at least one electrically activated emitter;
a first layer comprising a first encapsulant material overlying at least a portion of the at least one electrically activated emitter and arranged to receive emissions of the at least one electrically activated emitter; and
a second layer comprising a second encapsulant material overlying at least a portion of the first layer and arranged to receive emissions of the at least one electrically activated emitter, wherein the second encapsulant material is compositionally different from the first encapsulant material;
wherein an interface between the first layer and the second layer comprises at least one of the following features (i) and (ii);
(i) at least one outwardly protruding portion of the first layer that includes at least one protruding portion lateral wall of the first layer arranged in contact with the second layer, wherein the at least one protruding portion of the first layer comprises a height of at least 5 micrometers; and
(ii) at least one recess defined in the first layer that is bounded by at least one recess lateral wall of the first layer arranged in contact with the second layer, wherein the at least one recess defined in the first layer comprises a depth of at least 5 micrometers.
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Abstract
A lighting device includes an electrically activated emitter, a first layer that contains a first encapsulant material, and a second layer that contains a second encapsulant material, with a textured interface between the first layer and the second layer. Additional layers including further encapsulant materials and/or lumiphoric materials may be provided. Multiple textured interfaces may be provided. Textured interfaces may be arranged as lenses, including Fresnel lenses.
49 Citations
47 Claims
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1. A lighting device comprising:
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at least one electrically activated emitter; a first layer comprising a first encapsulant material overlying at least a portion of the at least one electrically activated emitter and arranged to receive emissions of the at least one electrically activated emitter; and a second layer comprising a second encapsulant material overlying at least a portion of the first layer and arranged to receive emissions of the at least one electrically activated emitter, wherein the second encapsulant material is compositionally different from the first encapsulant material; wherein an interface between the first layer and the second layer comprises at least one of the following features (i) and (ii); (i) at least one outwardly protruding portion of the first layer that includes at least one protruding portion lateral wall of the first layer arranged in contact with the second layer, wherein the at least one protruding portion of the first layer comprises a height of at least 5 micrometers; and (ii) at least one recess defined in the first layer that is bounded by at least one recess lateral wall of the first layer arranged in contact with the second layer, wherein the at least one recess defined in the first layer comprises a depth of at least 5 micrometers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A lighting device comprising:
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at least one electrically activated emitter; a first layer comprising at least one first encapsulant material arranged to receive light generated by at least one electrically activated emitter; and a second layer comprising at least one second encapsulant material overlying the first layer and arranged to receive emissions from the first layer, wherein the second encapsulant material is compositionally different from the first encapsulant material; wherein at least one of (a) at least one surface of the first layer, and (b) a surface of the second layer proximate to the first layer, comprises at least one of the following items (i) to (iv); (i) at least one outwardly protruding portion comprising a height of at least 5 micrometers; (ii) at least one recess comprising a depth of at least 5 micrometers; (iii) at least three features that are regularly spaced relative to one another with substantially equal gaps between adjacent features, wherein the at least three features that are regularly spaced include at least one of recesses and outwardly protruding portions; and (iv) at least three features comprising regularized height or depth that include at least one of recesses and outwardly protruding portions, including variation in height or depth of less than 20% among the at least three features comprising regularized height or depth. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A method for fabricating a lighting device, the method comprising:
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depositing a first layer comprising a first encapsulant material over at least a portion of at least one electrically activated emitter, with the first encapsulant material arranged to receive emissions of the at least one electrically activated emitter; forming at least one of the following items (i) to (iv) in or on the first layer; (i) at least one outwardly protruding portion of the first layer that includes at least one protruding portion lateral wall of the first layer, wherein the at least one protruding portion of the first layer comprises a height of at least 5 micrometers; (ii) at least one recess defined in the first layer that is bounded by at least one recess lateral wall of the first layer arranged in contact with the second layer, wherein the at least one recess defined in the first layer comprises a depth of at least 5 micrometers; (iii) at least three features that are regularly spaced relative to one another with substantially equal gaps between adjacent features, wherein the at least three features include at least one of recesses in the first layer and outwardly protruding portions of the first layer; and (iv) at least three features comprising regularized height or depth that include at least one of recesses in the first layer and outwardly protruding portions of the first layer, including variation in height or depth of less than 20% among the at least three features; and depositing a second layer comprising a second encapsulant material over at least a portion of the first layer and arranged to receive emissions of the at least one electrically activated emitter. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification