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; and
wherein the lighting device comprises at least one of the following features (a) to (d);
(a) a lumiphoric material-containing layer is arranged between at least portions of the first layer and the second layer;
(b) the first layer is arranged in contact with the at least one electrically activated emitter or is arranged in contact with a lumiphor-containing layer that contacts the at least one electrically activated emitter;
(c) the second layer overlies less than an entirety of the first layer; and
(d) a third layer overlies at least a portion of the second layer, wherein the third layer comprises a third encapsulant material that is compositionally different from the second encapsulant material, and wherein an interface between the second layer and the third layer comprises at least one of the following features (I) and (II);
(I) at least one outwardly protruding portion of the second layer that includes at least one protruding portion lateral wall of the second layer arranged in contact with the third layer, wherein the at least one protruding portion of the second layer comprises a height of at least 5 micrometers; and
(II) at least one recess defined in the second layer that is bounded by at least one recess lateral wall of the second layer arranged in contact with the third layer, wherein the at least one recess defined in the second 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.
39 Citations
46 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; and wherein the lighting device comprises at least one of the following features (a) to (d); (a) a lumiphoric material-containing layer is arranged between at least portions of the first layer and the second layer; (b) the first layer is arranged in contact with the at least one electrically activated emitter or is arranged in contact with a lumiphor-containing layer that contacts the at least one electrically activated emitter; (c) the second layer overlies less than an entirety of the first layer; and (d) a third layer overlies at least a portion of the second layer, wherein the third layer comprises a third encapsulant material that is compositionally different from the second encapsulant material, and wherein an interface between the second layer and the third layer comprises at least one of the following features (I) and (II);
(I) at least one outwardly protruding portion of the second layer that includes at least one protruding portion lateral wall of the second layer arranged in contact with the third layer, wherein the at least one protruding portion of the second layer comprises a height of at least 5 micrometers; and
(II) at least one recess defined in the second layer that is bounded by at least one recess lateral wall of the second layer arranged in contact with the third layer, wherein the at least one recess defined in the second 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)
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25. 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; and wherein the lighting device comprises at least one of the following features (A) to (D); (A) a lumiphoric material-containing layer is arranged between at least portions of the first layer and the second layer; (B) the first layer is arranged in contact with the at least one electrically activated emitter or is arranged in contact with a lumiphor-containing layer that contacts the at least one electrically activated emitter; (C) the second layer overlies less than an entirety of the first layer; and (D) a third layer overlies at least a portion of the second layer, wherein the third layer comprises a third encapsulant material that is compositionally different from the second encapsulant material, and wherein an interface between the second layer and the third layer comprises at least one of the following features (I) and (II);
(I) at least one outwardly protruding portion of the second layer that includes at least one protruding portion lateral wall of the second layer arranged in contact with the third layer, wherein the at least one protruding portion of the second layer comprises a height of at least 5 micrometers; and
(II) at least one recess defined in the second layer that is bounded by at least one recess lateral wall of the second layer arranged in contact with the third layer, wherein the at least one recess defined in the second layer comprises a depth of at least 5 micrometers. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification