US 2012/0235183 A1Published application

Light emitting device, illumination apparatus and display apparatus

AssigneeSony Corporation

InventorToshihiro Fukuda

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Abstract

Disclosed herein is a light emitting device including: an organic layer sandwiched between a first electrode and a second electrode to serve as an organic layer including a light emitting layer for emitting monochromatic light at one location; a first light reflection boundary face provided on a side close to the first electrode to serve as a boundary face for reflecting light emitted from the light emitting layer so as to radiate the reflected light from a side close to the second electrode; and a second light reflection boundary face, a third light reflection boundary face and a fourth light reflection boundary face which are sequentially provided at positions separated away from each other in a direction from the first electrode to the second electrode on the side close to the second electrode.

Claims20

Dependent claims

A light emitting device comprising:

an organic layer sandwiched between a first electrode and a second electrode to serve as an organic layer including a light emitting layer for emitting monochromatic light at one location;
a first light reflection boundary face provided on a side close to said first electrode to serve as a boundary face for reflecting light emitted from said light emitting layer so as to radiate said reflected light from a side close to said second electrode;
and
a second light reflection boundary face, a third light reflection boundary face and a fourth light reflection boundary face which are sequentially provided at positions separated away from each other in a direction from said first electrode to said second electrode on said side close to said second electrode,
wherein
with notation L1 denoting an optical distance between said first light reflection boundary face and the luminescence center of said light emitting layer,
with notation L2 denoting an optical distance between said luminescence center and said second light reflection boundary face,
with notation L3 denoting an optical distance between said luminescence center and said third light reflection boundary face,
with notation L4 denoting an optical distance between said luminescence center and said fourth light reflection boundary face,
with notation λ1 denoting the center wavelength of a light emission spectrum of said light emitting layer,
with notations n, m, m′ and m″ each denoting an integer,
with notations λ11, λ12, λ13 and λ14 each denoting an interference wavelength,
with the length unit nanometer taken as a unit of said wavelengths λ1, λ11, λ12, λ13 and λ14,
with notation φ1 denoting a phase change observed when light having wavelengths is reflected by said first light reflection boundary face,
with notation φ2 denoting a phase change observed when light having wavelengths is reflected by said second light reflection boundary face,
with notation φ3 denoting a phase change observed when light having wavelengths is reflected by said third light reflection boundary face, and
with notation φ4 denoting a phase change observed when light having wavelengths is reflected by said fourth light reflection boundary face,
said optical distances L1, L2, L3 and L4 satisfy all Expressions (1) to (8) given as follows:
where n≧0, 2L1/λ11+φ1/2π=n (1)
λ1−150<λ11<λ1+80 (2)
2L2/λ12+φ2/2π=m (3)
2L3/λ13+φ3/2π=m′+1/2 (4)
2L4/λ14+φ4/2π=m″+1/2 (5)
λ1−80<λ12<λ1+80 (6)
λ1−150<λ13<λ1+150 (7)
λ1−150<λ14<λ1+150 (8).

23 more elements

An illumination apparatus employing a plurality of light emitting devices which are used for emitting light having plain colors different from each other and each comprise:

an organic layer sandwiched between a first electrode and a second electrode to serve as an organic layer including a light emitting layer for emitting monochromatic light at one location;
a first light reflection boundary face provided on a side close to said first electrode to serve as a boundary face for reflecting light emitted from said light emitting layer so as to radiate said reflected light from a side close to said second electrode;
and
a second light reflection boundary face, a third light reflection boundary face and a fourth light reflection boundary face which are sequentially provided at positions separated away from each other in a direction from said first electrode to said second electrode on said side close to said second electrode,
wherein
with notation L1 denoting an optical distance between said first light reflection boundary face and the luminescence center of said light emitting layer,
with notation L2 denoting an optical distance between said luminescence center and said second light reflection boundary face,
with notation L3 denoting an optical distance between said luminescence center and said third light reflection boundary face,
with notation L4 denoting an optical distance between said luminescence center and said fourth light reflection boundary face,
with notation λ1 denoting the center wavelength of a light emission spectrum of said light emitting layer,
with notations n, m, m′ and m″ each denoting an integer,
with notations λ11, λ12, λ13 and λ14 each denoting an interference wavelength,
with the length unit nanometer taken as a unit of said wavelengths λ1, λ11, λ12, λ13 and λ14,
with notation φ1 denoting a phase change observed when light having wavelengths is reflected by said first light reflection boundary face,
with notation φ2 denoting a phase change observed when light having wavelengths is reflected by said second light reflection boundary face,
with notation φ3 denoting a phase change observed when light having wavelengths is reflected by said third light reflection boundary face, and
with notation φ4 denoting a phase change observed when light having wavelengths is reflected by said fourth light reflection boundary face,
said optical distances L1, L2, L3 and L4 satisfy all Expressions (1) to (8) given as follows:
where n≧0, 2L1/λ11+φ1/2π=n (1)
λ1−150<λ11<λ1+80 (2)
2L2/λ12+φ2/2π=m (3)
2L3/λ13+φ3/2π=m′+1/2 (4)
2L4/λ14+φ4/2π=m″+1/2 (5)
λ1−80<λ12<λ1+80 (6)
λ1−150<λ13<λ1+150 (7)
λ1−150<λ14<λ1+150 (8).

23 more elements

A display apparatus employing a plurality of light emitting devices which are used for emitting light having plain colors different from each other and each comprise:

an organic layer sandwiched between a first electrode and a second electrode to serve as an organic layer including a light emitting layer for emitting monochromatic light at one location;
a first light reflection boundary face provided on a side close to said first electrode to serve as a boundary face for reflecting light emitted from said light emitting layer so as to radiate said reflected light from a side close to said second electrode;
and
a second light reflection boundary face, a third light reflection boundary face and a fourth light reflection boundary face which are sequentially provided at positions separated away from each other in a direction from said first electrode to said second electrode on said side close to said second electrode,
wherein
with notation L1 denoting an optical distance between said first light reflection boundary face and the luminescence center of said light emitting layer,
with notation L2 denoting an optical distance between said luminescence center and said second light reflection boundary face,
with notation L3 denoting an optical distance between said luminescence center and said third light reflection boundary face,
with notation L4 denoting an optical distance between said luminescence center and said fourth light reflection boundary face,
with notation λ1 denoting the center wavelength of a light emission spectrum of said light emitting layer,
with notations n, m, m′ and m″ each denoting an integer,
with notations λ11, λ12, λ13 and λ14 each denoting an interference wavelength,
with the length unit nanometer taken as a unit of said wavelengths λ1, λ11, λ12, λ13 and λ14,
with notation φ1 denoting a phase change observed when light having wavelengths is reflected by said first light reflection boundary face,
with notation φ2 denoting a phase change observed when light having wavelengths is reflected by said second light reflection boundary face,
with notation φ3 denoting a phase change observed when light having wavelengths is reflected by said third light reflection boundary face, and
with notation φ4 denoting a phase change observed when light having wavelengths is reflected by said fourth light reflection boundary face,
said optical distances L1, L2, L3 and L4 satisfy all Expressions (1) to (8) given as follows:
where n≧0, 2L1/λ11+φ1/2π=n (1)
λ1−150<λ11<λ1+80 (2)
2L2/λ12+φ2/2π=m (3)
2L3/λ13+φ3/2π=m′+1/2 (4)
2L4/λ14+φ4/2π=m″+1/2 (5)
λ1−80<λ12<λ1+80 (6)
λ1−150<λ13<λ1+150 (7)
λ1−150<λ14<λ1+150 (8).

23 more elements

A light emitting device comprising:

an organic layer sandwiched between a first electrode and a second electrode to serve as an organic layer including a light emitting layer for emitting monochromatic light at one location;
a first light reflection boundary face provided on a side close to said first electrode to serve as a boundary face for reflecting light emitted from said light emitting layer so as to radiate said reflected light from a side close to said second electrode;
and
a second light reflection boundary face and a third light reflection boundary face which are sequentially provided at positions separated away from each other in a direction from said first electrode to said second electrode on said side close to said second electrode,
wherein
with notation L1 denoting an optical distance between said first light reflection boundary face and the luminescence center of said light emitting layer,
with notation L2 denoting an optical distance between said luminescence center and said second light reflection boundary face,
with notation L3 denoting an optical distance between said luminescence center and said third light reflection boundary face,
with notation λ1 denoting the center wavelength of a light emission spectrum of said light emitting layer,
with notations n, m and m′ each denoting an integer,
with notations λ11, λ12 and λ13 each denoting an interference wavelength,
with the length unit nanometer taken as a unit of said wavelengths λ1, λ11, λ12 and λ13,
with notation φ1 denoting a phase change observed when light having wavelengths is reflected by said first light reflection boundary face,
with notation φ2 denoting a phase change observed when light having wavelengths is reflected by said second light reflection boundary face, and
with notation φ3 denoting a phase change observed when light having wavelengths is reflected by said third light reflection boundary face,
said optical distances L1, L2 and L3 satisfy all Expressions (9) to (14) given as follows:
where n≧0, 2L1/λ11+φ1/2π=n (9)
λ1−150<λ11<λ1+80 (10)
2L2/λ12+φ2/2π=m (11)
2L3/λ13+φ3/2π=m′+1/2 (12)
λ1−80<λ12<λ1+80 (13)
λ1−150<λ13<λ1+150 (14).

19 more elements

An illumination apparatus employing a plurality of light emitting devices which are used for emitting light having plain colors different from each other and each comprise:

an organic layer sandwiched between a first electrode and a second electrode to serve as an organic layer including a light emitting layer for emitting monochromatic light at one location;
a first light reflection boundary face provided on a side close to said first electrode to serve as a boundary face for reflecting light emitted from said light emitting layer so as to radiate said reflected light from a side close to said second electrode;
and
a second light reflection boundary face and a third light reflection boundary face which are sequentially provided at positions separated away from each other in a direction from said first electrode to said second electrode on said side close to said second electrode,
wherein
with notation L1 denoting an optical distance between said first light reflection boundary face and the luminescence center of said light emitting layer,
with notation L2 denoting an optical distance between said luminescence center and said second light reflection boundary face,
with notation L3 denoting an optical distance between said luminescence center and said third light reflection boundary face,
with notation λ1 denoting the center wavelength of a light emission spectrum of said light emitting layer,
with notations n, m and m′ each denoting an integer,
with notations λ11, λ12 and λ13 each denoting an interference wavelength,
with the length unit nanometer taken as a unit of said wavelengths λ1, λ11, λ12 and λ13,
with notation φ1 denoting a phase change observed when light having wavelengths is reflected by said first light reflection boundary face,
with notation φ2 denoting a phase change observed when light having wavelengths is reflected by said second light reflection boundary face, and
with notation φ3 denoting a phase change observed when light having wavelengths is reflected by said third light reflection boundary face,
said optical distances L1, L2 and L3 satisfy all Expressions (9) to (14) given as follows:
where n≧0, 2L1/λ11+φ1/2π=n (9)
λ1−150<λ11<λ1+80 (10)
2L2/λ12+φ2/2π=m (11)
2L3/λ13+φ3/2π=m′+1/2 (12)
λ1−80<λ12<λ1+80 (13)
λ1−150<λ13<λ1+150 (14).

19 more elements

A display apparatus employing a plurality of light emitting devices which are used for emitting light having plain colors different from each other and each comprise:

an organic layer sandwiched between a first electrode and a second electrode to serve as an organic layer including a light emitting layer for emitting monochromatic light at one location;
a first light reflection boundary face provided on a side close to said first electrode to serve as a boundary face for reflecting light emitted from said light emitting layer so as to radiate said reflected light from a side close to said second electrode;
and
a second light reflection boundary face and a third light reflection boundary face which are sequentially provided at positions separated away from each other in a direction from said first electrode to said second electrode on said side close to said second electrode,
wherein
with notation L1 denoting an optical distance between said first light reflection boundary face and the luminescence center of said light emitting layer,
with notation L2 denoting an optical distance between said luminescence center and said second light reflection boundary face,
with notation L3 denoting an optical distance between said luminescence center and said third light reflection boundary face,
with notation λ1 denoting the center wavelength of a light emission spectrum of said light emitting layer,
with notations n, m and m′ each denoting an integer,
with notations λ11, λ12 and λ13 each denoting an interference wavelength,
with the length unit nanometer taken as a unit of said wavelengths λ1, λ11, λ12 and λ13,
with notation φ1 denoting a phase change observed when light having wavelengths is reflected by said first light reflection boundary face,
with notation φ2 denoting a phase change observed when light having wavelengths is reflected by said second light reflection boundary face, and
with notation φ3 denoting a phase change observed when light having wavelengths is reflected by said third light reflection boundary face, said optical distances L1, L2 and L3 satisfy all Expressions (9) to (14) given as follows:
where n≧0, 2L1/λ11+φ1/2π=n (9)
λ1−150<λ11<λ1+80 (10)
2L2/λ12+φ2/2π=m (11)
2L3/λ13+φ3/2π=m′+1/2 (12)
λ1−80<λ12<λ1+80 (13)
λ1−150<λ13<λ1+150 (14).

18 more elements

Dependencies are inferred from the claim text.