Rod-like light-emitting device, method of manufacturing rod-like light-emitting device, backlight, illuminating device, and display device
First Claim
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1. A rod-like light-emitting device comprising:
- a semiconductor core of a first conductivity type having a rod shape, the rod shape having a length and a circumference;
a semiconductor layer of a second conductivity type covering the semiconductor core so as to form a pn junction between the semiconductor core and the semiconductor layer coaxially with respect to the semiconductor core; and
a transparent electrode formed so as to cover substantially a whole of the semiconductor layer,wherein the semiconductor core comprises an n-type semiconductor and the semiconductor layer comprises a p-type semiconductor,wherein an outer peripheral surface of a part of the semiconductor core is exposed along the entire circumference of the rod shape, the exposed part having a part of the length of the rod shape, andwherein the rod-like light-emitting device has a diameter within a range of from 10 nm to 5 μ
m, inclusive, and a length within a range of from 100 nm to 200 μ
m, inclusive.
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Abstract
To facilitate electrode connections and achieve a high light emitting efficiency, a rod-like light-emitting device includes a semiconductor core of a first conductivity type having a rod shape, and a semiconductor layer of a second conductivity type formed to cover the semiconductor core. The outer peripheral surface of part of the semiconductor core is exposed.
59 Citations
16 Claims
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1. A rod-like light-emitting device comprising:
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a semiconductor core of a first conductivity type having a rod shape, the rod shape having a length and a circumference; a semiconductor layer of a second conductivity type covering the semiconductor core so as to form a pn junction between the semiconductor core and the semiconductor layer coaxially with respect to the semiconductor core; and a transparent electrode formed so as to cover substantially a whole of the semiconductor layer, wherein the semiconductor core comprises an n-type semiconductor and the semiconductor layer comprises a p-type semiconductor, wherein an outer peripheral surface of a part of the semiconductor core is exposed along the entire circumference of the rod shape, the exposed part having a part of the length of the rod shape, and wherein the rod-like light-emitting device has a diameter within a range of from 10 nm to 5 μ
m, inclusive, and a length within a range of from 100 nm to 200 μ
m, inclusive. - View Dependent Claims (15, 16)
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2. A rod-like light-emitting device comprising:
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a semiconductor core of a first conductivity type having a rod shape; a cap layer covering only one of two longitudinal ends of the rod shape of the semiconductor core; and a semiconductor layer of a second conductivity type covering an outer peripheral surface of a portion of the semiconductor core other than an exposed portion, the exposed portion of the semiconductor core being a portion opposite from a portion covered with the cap layer of the semiconductor core, wherein the cap layer is made of a material having a higher electric resistance than the semiconductor layer. - View Dependent Claims (3, 4, 5)
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6. A rod-like light-emitting device comprising:
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a semiconductor core of a first conductivity type having a rod shape; and a semiconductor layer of a second conductivity type covering an outer peripheral surface of a portion of the semiconductor core other than an exposed portion, the exposed portion of the semiconductor core being one end portion of the semiconductor core, wherein a step portion is provided between an outer peripheral surface of the exposed portion not covered with the semiconductor layer of the semiconductor core and an outer peripheral surface of a covered portion covered with the semiconductor layer of the semiconductor core. - View Dependent Claims (7, 8, 9)
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10. A rod-like light-emitting device comprising:
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a semiconductor core of a first conductivity type having a rod shape; a semiconductor layer of a second conductivity type covering one of two ends of the semiconductor core; an insulator covering an outer peripheral surface, not covered with the semiconductor layer, of the semiconductor core; and an underlying layer of the first conductivity type adjoining the other end of the semiconductor core, wherein an end surface of the underlying layer axially opposite from the semiconductor core and a peripheral surface of the underlying layer are exposed.
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11. A light-emitting apparatus comprising:
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a rod-like light-emitting device including a semiconductor core of a first conductivity type having a rod shape, the rod shape having a length and a circumference, a semiconductor layer of a second conductivity type formed to cover the semiconductor core so as to form a pn junction between the semiconductor core and the semiconductor layer coaxially with respect to the semiconductor core, and a transparent electrode formed so as to cover substantially a whole of the semiconductor layer, wherein the semiconductor core comprises an n-type semiconductor and the semiconductor layer comprises a p-type semiconductor, an outer peripheral surface of a part of the semiconductor core is exposed along the entire circumference of the rod shape, the exposed part having a part of the length of the rod shape, and the rod-like light-emitting device has a diameter within a range of from 10 nm to 5 μ
m, inclusive, and a length within a range of from 100 nm to 200 μ
m, inclusive; anda substrate on which the rod-like light-emitting device is mounted such that a longitudinal direction of the rod-like light-emitting device is parallel to a mounting surface of the substrate.
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12. A rod-like light-emitting device comprising:
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a semiconductor core of a first conductivity type having a rod shape, the rod shape having a length and a circumference; a semiconductor layer of a second conductivity type covering the semiconductor core so as to form a pn junction between the semiconductor core and the semiconductor layer coaxially with respect to the semiconductor core; and a transparent electrode formed so as to cover substantially a whole of the semiconductor layer, wherein the semiconductor core comprises an n-type semiconductor and the semiconductor layer comprises a p-type semiconductor, wherein the semiconductor core has, along the length of the rod shape, a first portion having an outer peripheral surface which is entirely covered with the semiconductor layer of the second conductivity type along the entire circumference of the rod shape, and a second portion having an outer peripheral surface which is at least partially exposed along at least part of the circumference of the rod shape without being covered with the semiconductor layer of the second conductivity type, and wherein the rod-like light-emitting device has a diameter within a range of from 10 nm to 5 μ
m, inclusive, and a length within a range of from 100 nm to 200 μ
m, inclusive.
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13. A rod-like light-emitting device comprising:
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a semiconductor core of a first conductivity type having a rod shape, the rod shape having a length and a circumference; and a semiconductor layer of a second conductivity type covering the semiconductor core, wherein an outer peripheral surface of a part of the semiconductor core is exposed along the entire circumference of the rod shape, the exposed part having a part of the length of the rod shape, wherein an outer peripheral surface of one of two longitudinal end portions of the semiconductor core is exposed, and wherein an end surface of the other of the two longitudinal end portions of the semiconductor core is covered with the semiconductor layer. - View Dependent Claims (14)
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Specification