LIGHT-EMITTING DEVICE, PRODUCTION METHOD THEREFOR, AND DISPLAY CONTAINING THE SAME
The present invention provides a light-emitting device which includes, in the order mentioned, a light-emitting layer containing a light-emitting portion, an interference layer, and a fine concavo-convex pattern, wherein the interference layer is disposed over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer, and reflects, toward the first surface, light emitted from the light-emitting layer, and wherein the fine concavo-convex pattern has a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer, and reflects light emitted from the light-emitting layer.
1 . A light-emitting device comprising, in the order mentioned:
a light-emitting layer containing a light-emitting portion,
an interference layer, and
a fine concavo-convex pattern,
wherein the interference layer is disposed over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer, and reflects, toward the first surface, light emitted from the light-emitting layer, and
wherein the fine concavo-convex pattern has a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer, and reflects light emitted from the light-emitting layer.
2 . The light-emitting device according to claim 1 , further comprising an intermediate layer between the interference layer and the fine concavo-convex pattern, wherein at least part of the intermediate layer has a refractive index of 0.9n to 2.0n, where n denotes a refractive index of the light-emitting portion with respect to light which has a main light-emitting wavelength and is emitted from the light-emitting layer.
3 . The light-emitting device according to claim 1 , wherein the interference layer is two or more in number, and the number of the interference layers is 2 to 100.
4 . The light-emitting device according to claim 1 , wherein the fine concavo-convex pattern has a pitch interval of 0.01λ to 100λ, where λ denotes a main light-emitting wavelength of light emitted from the light-emitting layer.
5 . The light-emitting device according to claim 1 , wherein the light-emitting layer contains two or more of the light-emitting portion.
6 . The light-emitting device according to claim 1 , wherein the fine concavo-convex pattern is made of heat-mode resist.
7 . The light-emitting device according to claim 1 , wherein the fine concavo-convex pattern comprises a reflective layer.
8 . The light-emitting device according to claim 1 , wherein a material for the interference layer is any one of TiO 2 , SiO 2 , SiN, Si 3 N 4 , Al 2 O 3 and a mixture thereof.
9 . The light-emitting device according to claim 3 , wherein at least one of the interference layers has an optical thickness which falls within a range of (2n 3 +1)λ/4±λ/8, where λ and n 3 respectively denote a main light-emitting wavelength of light emitted from the light-emitting layer and a refractive index of the light-emitting layer with respect to light having the main light-emitting wavelength.
10 . The light-emitting device according to claim 1 , wherein the interference layer has a thickness of 1 nm to 10,000 nm.
11 . The light-emitting device according to claim 7 , wherein the reflective layer is laid over at least one surface of the fine concavo-convex pattern.
12 . The light-emitting device according to claim 1 , wherein the light-emitting layer further comprises a seal layer for sealing the light-emitting portion, and wherein a material of the seal layer is any of an acrylic resin, an epoxy resin, a fluorine-containing resin, a silicone resin, a rubber resin and an ester resin.
13 . The light-emitting device according to claim 1 , wherein the light-emitting portion is an organic EL device.
14 . A production method for a light-emitting device, comprising:
forming a light-emitting layer containing a light-emitting portion,
forming an interference layer over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer, the interference layer reflecting, toward the first surface, light emitted from the light-emitting layer, and
forming, over the interference layer, a fine concavo-convex pattern having a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer, the fine concavo-convex pattern reflecting light emitted from the light-emitting layer,
wherein the fine concavo-convex pattern is formed through heat-mode lithography.
15 . A display comprising:
a light-emitting device which comprises, in the order mentioned:
a light-emitting layer containing a light-emitting portion,
an interference layer, and
a fine concavo-convex pattern,
wherein the interference layer is disposed over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer, and reflects, toward the first surface, light emitted from the light-emitting layer, and
wherein the fine concavo-convex pattern has a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer, and reflects light emitted from the light-emitting layer.