Light-emitting apparatus having periodic structure and sandwiched optical waveguide

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 in the insulating member.

2. The light-emitting apparatus according to claim 1 , wherein a period a of the periodic structure satisfies

1

n

+

n

ex

⁢

λ

<

a

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 light of red color, a light-emitting device for emitting light of green color, and a light-emitting device for emitting light of blue color, wherein a period of the periodic structure of the light-emitting device for emitting light of red color is the longest and a period of the periodic structure of the light-emitting device for emitting light of blue color 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 a period a of the periodic structure satisfies the following equation:

m

1

2

+

m

2

2

n

+

n

ex

⁢

λ

<

a

<

m

1

2

+

m

2

2

n

ex

⁢

λ

with respect to integers m 1 and m 2 , 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.

7. The light-emitting apparatus according to claim 1 , further comprising a microcavity structure in a stack direction of the light-emitting device.

8. The light-emitting apparatus according to claim 1 , 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 1 , 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 in an in-plane direction of the substrate.

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.

13. The light-emitting apparatus according to claim 1 , wherein the optical waveguide is formed in the insulating member and between a bottom portion of the periodic structure and the first electrode or between the bottom portion of the periodic structure and the substrate.