LIGHT-EMITTING APPARATUS, ILLUMINATION APPARATUS, AND DISPLAY APPARATUS

• US 20110187260A1
• Filed: 01/21/2011
• Published: 08/04/2011
• Est. Priority Date: 01/29/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yamada, Jiro, Fukuda, Toshihiro, Ebihara, Yohei
• Granted Patent: US 8,373,342 B2
• Time in Patent Office: Days
• US Class Current: 313/114
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers

Abstract

A light-emitting apparatus includes: light-emitting devices emitting light of different single colors in a visible wavelength region, wherein each of the light-emitting devices includes an organic layer which is interposed between first and second electrodes and in which a first or second light-emitting layer emitting light of different single colors is included at a first or second position separated from each other in a direction from the first electrode to the second electrode; a first reflective interface which is provided on the side of the first electrode so as to reflect light emitted from the first or second light-emitting layer to be emitted from the side of the second electrode; and a second reflective interface and a third reflective interface which are provided on the side of the second electrode at mutually separated positions in that order in a direction from the first electrode to the second electrode.

Claims

1. A light-emitting apparatus comprising:

a plurality of light-emitting devices emitting light of different single colors in a visible wavelength region,

wherein each of the plurality of light-emitting devices includes

an organic layer which is interposed between a first electrode and a second electrode and in which a first light-emitting layer or a second light-emitting layer emitting light of different single colors is included at a first position or a second position separated from each other in a direction from the first electrode to the second electrode;

a first reflective interface which is provided on the side of the first electrode so as to reflect light emitted from the first light-emitting layer or the second light-emitting layer to be emitted from the side of the second electrode; and

a second reflective interface and a third reflective interface which are provided on the side of the second electrode at mutually separated positions in that order in a direction from the first electrode to the second electrode,

wherein when the optical distance between the first reflective interface and the luminescent center of the first light-emitting layer is L11, the optical distance between the first reflective interface and the luminescent center of the second light-emitting layer is L21, an optical distance between the luminescent center of the first light-emitting layer and the second reflective interface is L12, an optical distance between the luminescent center of the second light-emitting layer and the second reflective interface is L22, an optical distance between the luminescent center of the first light-emitting layer and the third reflective interface is L13, an optical distance between the luminescent center of the second light-emitting layer and the third reflective interface is L23, the central wavelength of an emission spectrum of the first light-emitting layer is λ

1, and the central wavelength of an emission spectrum of the second light-emitting layer is λ

2, L11, L21, L12, L22, L13, and L23 satisfy all the expressions (1) to (6) and at least one of the expressions (7) and (8).

2L11/λ

11+φ

1/2π

=0 

 

(1)

2L21/λ

21+φ

1/2π

=n (where n≧

1) 

 

(2)

λ

1−

150<

λ

11<

λ

1+80 

 

(3)

λ

2−

30<

λ

21<

λ

2+80 

 

(4)

2L12/λ

12+φ

2/2π

=m′

+1/2 and 2L13/λ

13+φ

3/2π

=m″

, or 2L12/λ

12+φ

2/2π

=m′ and

2L13/λ

13+φ

3/2π

=m″

+1/2 

 

(5)

2L22/λ

22+φ

2/2π

=n′

+1/2 and 2L23/λ

23+φ

3/2π

=n″

, or 2L22/λ

22+φ

2/2π

=n′ and

2L23/λ

23+φ

3/2π

=n″

+1/2, or 2L22/λ

22+φ

2/2π

=n′

+1/2 and 2L23/λ

23+φ

3/2π

=n″

+1/2 

 

(6)

λ

22<

λ

2−

15 or λ

23>

λ

2+15 

 

(7)

λ

23<

λ

2−

15 or λ

22>

λ

2+15 

 

(8)

where m′

, m″

, n, n′

, n″

are integers,

λ

1, λ

2, λ

11, λ

21, λ

12, λ

22, λ

13, and λ

23 are in units of nm,

φ

1 is a phase shift occurring when light of each wavelength is reflected by the first reflective interface,

φ

2 is a phase shift occurring when light of each wavelength is reflected by the second reflective interface, and

φ

3 is a phase shift occurring when light of each wavelength is reflected by the third reflective interface.

2. The light-emitting apparatus according to claim 1, wherein peaks of a spectral transmittance curve of an interference filter of the light-emitting device are substantially flat in the visible wavelength region, or the slopes thereof are substantially the same.

3. The light-emitting apparatus according to claim 2, wherein a decrease of luminance of the light-emitting device at a viewing angle of 45°

is 30% or less with respect to luminance at a viewing angle of 0°

, and a chromaticity shift of Δ

uv≦

0.015 is obtained.

4. The light-emitting apparatus according to claim 3, wherein n=1.

5. The light-emitting apparatus according to claim 1, wherein the first electrode, the organic layer, and the second electrode are sequentially stacked on a substrate.

6. The light-emitting apparatus according to claim 5, wherein a transparent electrode layer having a thickness of 1 μ

m or more, a transparent insulating layer, a resin layer, a glass layer, or an air layer is formed on an outer side of the third reflective interface.

7. The light-emitting apparatus according to claim 1, wherein the second electrode, the organic layer, and the first electrode are sequentially stacked on a substrate.

8. The light-emitting apparatus according to claim 7, wherein a transparent electrode layer having a thickness of 1 μ

m or more, a transparent insulating layer, a resin layer, a glass layer, or an air layer is formed on an outer side of the third reflective interface.

9. The light-emitting apparatus according to claim 1, wherein a metal layer having a thickness of 5 nm or less is formed between the second light-emitting layer and the second electrode.

10. The light-emitting device according to claim 1, wherein at least one of the first reflective interface, the second reflective interface, and the third reflective interface is divided into a plurality of reflective interfaces.

11. The light-emitting device according to claim 1, further comprising a reflective layer for maintaining the flatness of the peaks of a spectral transmittance curve of an interference filter of the light-emitting device.

12. An illumination apparatus comprising:

a plurality of light-emitting devices emitting light of different single colors in a visible wavelength region,

wherein each of the plurality of light-emitting devices includes

an organic layer which is interposed between a first electrode and a second electrode and in which a first light-emitting layer or a second light-emitting layer emitting light of different single colors is included at a first position or a second position separated from each other in a direction from the first electrode to the second electrode;

a first reflective interface which is provided on the side of the first electrode so as to reflect light emitted from the first light-emitting layer or the second light-emitting layer to be emitted from the side of the second electrode; and

a second reflective interface and a third reflective interface which are provided on the side of the second electrode at mutually separated positions in that order in a direction from the first electrode to the second electrode,

wherein when the optical distance between the first reflective interface and the luminescent center of the first light-emitting layer is L11, the optical distance between the first reflective interface and the luminescent center of the second light-emitting layer is L21, an optical distance between the luminescent center of the first light-emitting layer and the second reflective interface is L12, an optical distance between the luminescent center of the second light-emitting layer and the second reflective interface is L22, an optical distance between the luminescent center of the first light-emitting layer and the third reflective interface is L13, an optical distance between the luminescent center of the second light-emitting layer and the third reflective interface is L23, the central wavelength of an emission spectrum of the first light-emitting layer is λ

1, and the central wavelength of an emission spectrum of the second light-emitting layer is λ

2, L11, L21, L12, L22, L13, and L23 satisfy all the expressions (1) to (6) and at least one of the expressions (7) and (8).

2L11/λ

11+φ

1/2π

=0 

 

(1)

2L21/λ

21+φ

1/2π

=n (where n≧

1) 

 

(2)

λ

1−

150<

λ

11<

λ

1+80 

 

(3)

λ

2−

30<

λ

21<

λ

2+80 

 

(4)

2L12/λ

12+φ

2/2π

=m′

+1/2 and 2L13/λ

13+φ

3/2π

=m″

, or 2L12/λ

12+φ

2/2π

=m′ and

2L13/λ

13+φ

3/2π

=m″

+1/2 

 

(5)

2L22/λ

22+φ

2/2π

=n′

+1/2 and 2L23/λ

23+φ

3/2π

=n″

, or 2L22/λ

22+φ

2/2π

=n′ and

2L23/λ

23+φ

3/2π

=n″

+1/2, or 2L22/λ

22+φ

2/2π

=n′

+1/2 and 2L23/λ

23+φ

3/2π

=n″

+1/2 

 

(6)

λ

22<

λ

2−

15 or λ

23>

λ

2+15 

 

(7)

λ

23<

λ

2−

15 or λ

22>

λ

2+15 

 

(8)

where m′

, m″

, n, n′

, n″

are integers,

λ

1, λ

2, λ

11, λ

21, λ

12, λ

22, λ

13, and λ

23 are in units of nm,

φ

1 is a phase shift occurring when light of each wavelength is reflected by the first reflective interface,

φ

2 is a phase shift occurring when light of each wavelength is reflected by the second reflective interface, and

φ

3 is a phase shift occurring when light of each wavelength is reflected by the third reflective interface.

13. A display apparatus comprising:

a plurality of light-emitting devices emitting light of different single colors in a visible wavelength region,

wherein each of the plurality of light-emitting devices includes

an organic layer which is interposed between a first electrode and a second electrode and in which a first light-emitting layer or a second light-emitting layer emitting light of different single colors is included at a first position or a second position separated from each other in a direction from the first electrode to the second electrode;

a first reflective interface which is provided on the side of the first electrode so as to reflect light emitted from the first light-emitting layer or the second light-emitting layer to be emitted from the side of the second electrode; and

a second reflective interface and a third reflective interface which are provided on the side of the second electrode at mutually separated positions in that order in a direction from the first electrode to the second electrode,

wherein when the optical distance between the first reflective interface and the luminescent center of the first light-emitting layer is L11, the optical distance between the first reflective interface and the luminescent center of the second light-emitting layer is L21, an optical distance between the luminescent center of the first light-emitting layer and the second reflective interface is L12, an optical distance between the luminescent center of the second light-emitting layer and the second reflective interface is L22, an optical distance between the luminescent center of the first light-emitting layer and the third reflective interface is L13, an optical distance between the luminescent center of the second light-emitting layer and the third reflective interface is L23, the central wavelength of an emission spectrum of the first light-emitting layer is λ

1, and the central wavelength of an emission spectrum of the second light-emitting layer is λ

2, L11, L21, L12, L22, L13, and L23 satisfy all the expressions (1) to (6) and at least one of the expressions (7) and (8).

2L11/λ

11+φ

1/2π

=0 

 

(1)

2L21/λ

21+φ

1/2π

=n (where n≧

1) 

 

(2)

λ

1−

150<

λ

11<

λ

1+80 

 

(3)

λ

2−

30<

λ

21<

λ

2+80 

 

(4)

2L12/λ

12+φ

2/2π

=m′

+1/2 and 2L13/λ

13+φ

3/2π

=m″

, or 2L12/λ

12+φ

2/2π

=m′ and

2L13/λ

13+φ

3/2π

=m″

+1/2 

 

(5)

2L22/λ

22+φ

2/2π

=n′

+1/2 and 2L23/λ

23+φ

3/2π

=n″

, or 2L22/λ

22+φ

2/2π

=n′ and

2L23/λ

23+φ

3/2π

=n″

+1/2, or 2L22/λ

22+φ

2/2π

=n′

+1/2 and 2L23/λ

23+φ

3/2π

=n″

+1/2 

 

(6)

λ

22<

λ

2−

15 or λ

23>

λ

2+15 

 

(7)

λ

23<

λ

2−

15 or λ

22>

λ

2+15 

 

(8)

where m′

, m″

, n, n′

, n″

are integers,

λ

1, λ

2, λ

11, λ

21, λ

12, λ

22, λ

13, and λ

23 are in units of nm,

φ

1 is a phase shift occurring when light of each wavelength is reflected by the first reflective interface,

φ

2 is a phase shift occurring when light of each wavelength is reflected by the second reflective interface, and

φ

3 is a phase shift occurring when light of each wavelength is reflected by the third reflective interface.

14. The display apparatus according to claim 13, further comprising:

a driving substrate on which an active device is provided so as to supply a display signal corresponding to a display pixel to the light-emitting device; and

a sealing substrate provided so as to face the driving substrate,

wherein the light-emitting device is disposed between the driving substrate and the sealing substrate.

15. The display apparatus according to claim 14, wherein a color filter which transmits light emitted from the side of the second electrode is provided on a substrate that is disposed on the side of the second electrode of the light-emitting device among the driving substrate and the sealing substrate.