Self-luminous device
First Claim
1. A self-luminous device comprising:
- a first layer;
a light emitting layer overlaying the first layer; and
a second layer overlaying the light emitting layer, wherein a two-dimensional periodic structure is formed on a surface of the second layer or on a surface of a layer overlaying the second layer, and wherein a distance between a top of the light emitting layer and a bottom of the two-dimensional periodic structure is 0.1λ
to 0.3λ
, or 0.3λ
to λ
(where λ
is the wavelength of light in vacuum).
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Accused Products
Abstract
A self-luminous device 1 is one embodiment which has an increased light extraction efficiency by optimizing the distribution of refractive index in semiconductor layers. The self-luminous device 1 includes a first layer (semiconductor layer 2), a light emitting layer 3 overlaying the first layer (semiconductor layer 2), and a second layer (semiconductor layer 4) overlaying the light emitting layer 3. The first layer (semiconductor layer 2) and the second layer (semiconductor layer 4) have different refractive indices so that the refractive indices of the two layers (semiconductor layers 2 and 4) are asymmetric with respect to the light emitting layer interposed therebetween. In the refractive index distribution of asymmetric layers (semiconductor layers), the refractive index of the second layer (semiconductor layer 4) is higher than that of the first layer (semiconductor layer 2).
69 Citations
21 Claims
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1. A self-luminous device comprising:
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a first layer; a light emitting layer overlaying the first layer; and a second layer overlaying the light emitting layer, wherein a two-dimensional periodic structure is formed on a surface of the second layer or on a surface of a layer overlaying the second layer, and wherein a distance between a top of the light emitting layer and a bottom of the two-dimensional periodic structure is 0.1λ
to 0.3λ
, or 0.3λ
to λ
(where λ
is the wavelength of light in vacuum). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A self-luminous device comprising:
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a first layer; a light emitting layer overlaying the first layer; a second layer overlaying the light emitting layer; and an intermediate layer formed within the second layer, wherein the intermediate layer has a refractive index close to that of the light emitting layer and is made of a medium that does not absorb light emitted from the light emitting layer. - View Dependent Claims (10, 11, 12)
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13. A self-luminous device comprising:
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a first layer; a light emitting layer overlaying the first layer; a second layer overlaying the light emitting layer; and an intermediate layer formed within the second layer, wherein a refractive index of the intermediate layer is higher than those of the first layer and the second layer. - View Dependent Claims (14, 15, 16)
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17. A self-luminous device comprising:
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a first layer; a light emitting layer overlaying the first layer; and a second layer overlaying the light emitting layer, wherein a two-dimensional periodic structure is formed on a surface of the second layer or on a surface of a layer overlaying the second layer, and the first layer is a low refractive index layer that has a refractive index lower than that of the light emitting layer and equal to, or lower than, that of the second layer. - View Dependent Claims (18, 19, 20, 21)
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Specification