US 8,946,684 B2Granted

Light-emitting device, illumination apparatus, and display apparatus

AssigneeSony Corporation

InventorsToshihiro Fukuda, Jiro Yamada, Yohei Ebihara

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Abstract

A light-emitting device includes: an organic layer which is interposed between a first electrode and a second electrode and in which a first light-emitting layer and a second light-emitting layer emitting light of single colors or two or more different colors in a visible wavelength region are sequentially included at mutually separated positions in that order 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 and 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 sequentially 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.

Claims15

Dependent claims

A light-emitting device comprising:

a first electrode;
a second electrode;
an organic layer in-between the first and second electrodes, the organic layer comprising (a) a first light-emitting layer and (b) a second light-emitting layer in that order in a direction from the first electrode to the second electrode;
a first reflective interface on a side of the first electrode facing the organic layer configured to reflect light emitted from the first and second light-emitting layers;
and
a second reflective interface and a third reflective interface on a side of the second electrode facing the first electrode in that order in a direction from the first electrode to the second electrode,
wherein,
(a) 2L11/λ11 nm+φ1/2π=0, where L11 represents an optical distance between the first reflective interface and a luminescent center of the first light-emitting layer and φ1 is a phase shift occurring when light of each wavelength is reflected by the first reflective interface,
(b) 2L21/λ21 nm+φ1/2π=n, where L21 represents an optical distance between the first reflective interface and a luminescent center of the second light-emitting layer and n≧1,
(c) λ1−150<λ11 nm<λ1+80, where λ1 represents a central wavelength of an emission spectrum of the first light-emitting layer,
(d) λ2−30<λ21 nm<λ2+80, where λ2 is a central wavelength of an emission spectrum of the second light-emitting layer,
(e) (i) 2L12/λ12 nm+φ2/2π=m′+1/2 and 2L13/λ13 nm+φ3/2π=m″ or (ii) 2L12/λ12 nm+φ2/2π=m′ and 2L13/λ13 nm+φ3/2π=m″+1/2, where L12 represents an optical distance between the luminescent center of the first light-emitting layer and the second reflective interface, L13 represents an optical distance between the luminescent center of the first light-emitting layer, φ2 represents a phase shift occurring when light of each wavelength is reflected by the second reflective interface, φ3 represents a phase shift occurring when light of each wavelength is reflected by the third reflective interface, and each of m′ and m″ represent an integer,
(f) (i) 2L22/λ22 nm+φ2/2π=n′+1/2 and 2L23/λ23 nm+φ3/2π=n″, (ii) 2L22/λ22 nm+φ2/2π=n′ and 2L23/λ23 nm+φ3/2π=n″+1/2, or (iii) 2L22/λ22 nm+φ2/2π=n′+1/2 and 2L23/λ23 nm+φ3/2π=n″+1/2, where L22 represents the optical distance between the luminescent center of the second light-emitting layer and the second reflective interface, L23 represents the optical distance between the luminescent center of the second light-emitting layer and the third reflective interface, φ2 represents the phase shift occurring when light of each wavelength is reflected by the second reflective interface, φ3 represents the phase shift occurring when light of each wavelength is reflected by the third reflective interface, and n′ and n″ each represent an integer, and
(g) at least one of (i) λ22<λ2−15 nm or λ23>λ2+15 nm and (ii) λ23<λ2−15 nm or λ22>λ2+15 nm.

11 more elements

An illumination apparatus comprising:

at least one light-emitting device,
wherein the light-emitting device includes:
an organic layer between a first electrode and a second electrode, the organic layer comprising (a) a first light-emitting layer and (b) a second light-emitting layer in that order in a direction from the first electrode to the second electrode,
a first reflective interface on a side of the first electrode facing the organic layer, the first reflective interface configured to reflect light emitted from the first and second light-emitting layers,
a second reflective interface and a third reflective interface which are sequentially provided on a side of the second electrode facing the first electrode in that order in a direction from the first electrode to the second electrode, and
λ1, λ2, λ11, λ21, λ12, λ22, λ13, and λ23 are as follows:
(a) 2L11/λ11 nm+φ1/2π=0, where L11 represents an optical distance between the first reflective interface and a luminescent center of the first light-emitting layer and φ1 is a phase shift occurring when light of each wavelength is reflected by the first reflective interface,
(b) 2L21/λ21 nm+φ1/2π=n, where L21 represents an optical distance between the first reflective interface and a luminescent center of the second light-emitting layer and n≧1,
(c) λ1−150<λ11 nm<λ1+80, where λ1 represents a central wavelength of an emission spectrum of the first light-emitting layer,
(d) λ2−30<λ21 nm<λ2+80, where λ2 is a central wavelength of an emission spectrum of the second light-emitting layer,
(e) (i) 2L12/λ12 nm+φ2/2π=m′+1/2 and 2L13/λ13 nm+φ3/2π=m″ or (ii) 2L12/λ12 nm+φ2/2π=m′ and 2L13/λ13 nm+φ3/2π=m″+1/2, where L12 represents an optical distance between the luminescent center of the first light-emitting layer and the second reflective interface, L13 represents an optical distance between the luminescent center of the first light-emitting layer, φ2 represents a phase shift occurring when light of each wavelength is reflected by the second reflective interface, φ3 represents a phase shift occurring when light of each wavelength is reflected by the third reflective interface, and each of m′ and m″ represent an integer,
(f) (i) 2L22λ22 nm+φ2/2π=n′+1/2 and 2L23/λ23 nm+φ3/2π=n″, (ii) 2L22/λ22 nm+φ2/2π=n′ and 2L23/λ23 nm+φ3/2π=n″+1/2, or (iii) 2L22/λ22 nm+φ2/2π=n′+1/2 and 2L23/λ23 nm+φ3/2π=n″+1/2, where L22 represents the optical distance between the luminescent center of the second light-emitting layer and the second reflective interface, L23 represents the optical distance between the luminescent center of the second light-emitting layer and the third reflective interface, φ2 represents the phase shift occurring when light of each wavelength is reflected by the second reflective interface, φ3 represents the phase shift occurring when light of each wavelength is reflected by the third reflective interface, and n′ and n″ each represent an integer, and
(g) at least one of (i) λ22<λ2−15 nm or λ23>λ2+15 nm and (ii) λ23<λ2−15 nm or λ22>λ2+15 nm.

10 more elements

A display apparatus comprising:

at least one light-emitting device,
wherein the light-emitting device includes:
an organic layer between a first electrode and a second electrode, the organic layer comprising (a) a first light-emitting layer and (b) a second light-emitting layer in that order in a direction from the first electrode to the second electrode,
a first reflective interface on a side of the first electrode facing the organic layer, the first reflective interface configured to reflect light emitted from the first light-emitting layer and the second light-emitting layer, and
a second reflective interface and a third reflective interface on a side of the second electrode facing the first electrode in that order in a direction from the first electrode to the second electrode,
λ1, λ2, λ11, λ21, λ12, λ22, λ13, and λ23 are as follows:
(a) 2L11/λ11 nm+φ1/2π=0, where L11 represents an optical distance between the first reflective interface and a luminescent center of the first light-emitting layer and φ1 is a phase shift occurring when light of each wavelength is reflected by the first reflective interface,
(b) 2L21/λ21 nm+φ1/2π=n, where L21 represents an optical distance between the first reflective interface and a luminescent center of the second light-emitting layer and n≧1,
(c) λ1−150<λ11 nm<λ1+80, where λ1 represents a central wavelength of an emission spectrum of the first light-emitting layer,
(d) λ2−30<λ21 nm<λ2+80, where λ2 is a central wavelength of an emission spectrum of the second light-emitting layer,
(e) (i) 2L12/λ12 nm+φ2/2π=m′+1/2 and 2L13/λ13 nm+φ3/2π=m″ or (ii) 2L12/λ12 nm+φ2/2π=m′ and 2L13/λ13 nm+φ3/2π=m″+1/2, where L12 represents an optical distance between the luminescent center of the first light-emitting layer and the second reflective interface, L13 represents an optical distance between the luminescent center of the first light-emitting layer, φ2 represents a phase shift occurring when light of each wavelength is reflected by the second reflective interface, φ3 represents a phase shift occurring when light of each wavelength is reflected by the third reflective interface, and each of m′ and m″ represent an integer,
(f) (i) 2L22/λ22 nm+φ2/2π=n′+1/2 and 2L23/λ23 nm+φ3/2π=n″, (ii) 2L22/λ22 nm+φ2/2π=n′ and 2L23/λ23 nm+φ3/2π=n″+1/2, or (iii) 2L22/λ22 nm+φ2/2π=n′+1/2 and 2L23/λ23 nm+φ3/2π=n″+1/2, where L22 represents the optical distance between the luminescent center of the second light-emitting layer and the second reflective interface, L23 represents the optical distance between the luminescent center of the second light-emitting layer and the third reflective interface, φ2 represents the phase shift occurring when light of each wavelength is reflected by the second reflective interface, φ3 represents the phase shift occurring when light of each wavelength is reflected by the third reflective interface, and n′ and n″ each represent an integer, and
(g) at least one of (i) λ22<λ2−15 nm or λ23>λ2+15 nm and (ii) λ23<λ2−15 nm or λ22>λ2+15 nm.

10 more elements

Dependencies are inferred from the claim text.