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1. US20080303419 - Light-emitting apparatus having periodic structure and sandwiched optical waveguide

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[ EN ]

Claims

1. A light-emitting apparatus comprising:
a substrate; and
a light-emitting device formed on the substrate, the light-emitting device comprising:
a first electrode formed on the substrate;
an insulating member covering a periphery of the first electrode;
a functional layer formed on an exposed portion of the first electrode and comprising an emission layer; and
a second electrode formed on the functional layer and the insulating member,
wherein a periodic structure is formed on a surface of the insulating member opposite to a substrate side, and an optical waveguide is formed between a bottom portion of the periodic structure and the first electrode or between the bottom portion of the periodic structure and the substrate.
2. The light-emitting apparatus according to claim 1, wherein a period a of the periodic structure satisfies
( NB)
with respect to a refractive index n of the emission layer, a refractive index n ex of a light extraction side medium, and a peak wavelength λ of a spectrum of light extracted outside via the periodic structure.
3. The light-emitting apparatus according to claim 1, wherein a period of the periodic structure is larger than 0.25 times a peak wavelength of a spectrum of light extracted outside via the periodic structure.
4. The light-emitting apparatus according to claim 1, which comprises a light-emitting device for emitting red light, a light-emitting device for emitting green light, and a light-emitting device for emitting blue light, wherein a period of the periodic structure of the light-emitting device for emitting red light is the longest and a period of the periodic structure of the light-emitting device for emitting blue light is the shortest.
5. The light-emitting apparatus according to claim 1, wherein the light-emitting device is arranged in plurality in vertical and horizontal directions in an emission region, and the periodic structure of the light-emitting devices arranged in the vertical direction and the periodic structure of the light-emitting devices arranged in the horizontal direction have the same period.
6. The light-emitting apparatus according to claim 1, further comprising a black matrix on a light extraction side of the periodic structure, wherein light extracted outside via the periodic structure has a maximum intensity or a maximum luminance in a direction of an angle larger than 90° with respect to a propagation direction of guided-wave light in the optical waveguide.
7. The light-emitting apparatus according to claim 6, further comprising a microcavity structure in a stack direction of the light-emitting device.
8. The light-emitting apparatus according to claim 7, further comprising a color filter for transmitting light emitted from the light-emitting device on a light extraction side of the light-emitting device.
9. The light-emitting apparatus according to claim 7, further comprising a circularly polarizing plate on the light extraction side of the light-emitting device.
10. The light-emitting apparatus according to claim 1, wherein the periodic structure has a structure in which a height of the optical waveguide varies continuously.
11. The light-emitting apparatus according to claim 1, wherein a refractive index of the insulating member and a refractive index of the second electrode are equal to each other.
12. The light-emitting apparatus according to claim 1, wherein the light-emitting device is an OLED device.