Light extraction layered body, organic electroluminescence element, and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2017005295-A1
Application number	US-201515125849-A
Country	US
Kind code	A1
Filing date	Apr 3, 2015
Priority date	Apr 28, 2014
Publication date	Jan 5, 2017
Grant date	—

Abstract

A light extraction layered body, characterized in being flexible enough to exhibit no cracking when a flex test is performed by inducing ten cycles of bending at a flex radius of 5 mm and a bend angle of 180° in a layered body in which a light extraction layer is provided on one main surface of a transparent substrate that measures 3 μm to 50 μm in thickness, and when subsequently a 500×500 μm surface region is observed in the light extraction layer using a light diffraction microscope.

First claim

1 . A light extraction layered body, which is provided on one main surface of a transparent substrate having a thickness of 3 μm or more and 50 μm or less, wherein the light extraction layered body has a bending property of generating no crack when a surface region of 500 μm×500 μm of the light extraction layer is observed with a light diffraction microscope, after a bending test is performed on the layered body under conditions of a radius of curvature of 5 mm, a bending angle of 180 degrees, and bending cycles of ten.

2 . An organic electroluminescence element, wherein it has a bending property of generating no brightness unevenness when the brightness unevenness is measured at a time of light emission of 1000 cd/m 2 with a 50 magnification microscope, after a bending test is performed on an organic electroluminescence element obtained by laminating at least a transparent electrode, a light-emitting functional layer, a counter electrode, and a sealing member on a layered body in which a light extraction layer is provided on one main surface of a transparent substrate having a thickness of 3 μm or more and 50 μm or less under conditions of a radius of curvature of 5 mm, a bending angle of 180 degrees, and bending cycles of ten.

3 . The organic electroluminescence element according to claim 2 , wherein the layered body has a bending property of generating no crack when a surface region of 500 μm×500 μm of the light extraction layer is observed with a light diffraction microscope, after a bending test is performed on the layered body under conditions of a radius of curvature of 5 mm, a bending angle of 180 degrees, and bending cycles of ten.

4 . The organic electroluminescence element according to claim 2 , wherein
the light extraction layer is configured by laminating a scattering layer and a smoothing layer in this order on the transparent substrate, and the smoothing layer contains a resin material having an elongation percentage of 10% or more in a tensile test and an inorganic material.

5 . The organic electroluminescence element according to claim 4 , wherein the resin material is a resin polymer in which at least one of a urethane acrylate and an acryl resin acrylate is used.

6 . The organic electroluminescence element according to claim 3 , wherein
the light extraction layer is configured by laminating the scattering layer and the smoothing layer in this order on the transparent substrate, and the scattering layer has a sea-island structure in which the light scattering materials are dispersed in the form of island on the transparent substrate.

7 . The organic electroluminescence element according to claim 6 , wherein a diameter of the island in the sea-island structure is 10 μm or more and 100 μm or less.

8 . The organic electroluminescence element according to claim 7 , wherein a space between adjacent islands is 10 μm or less.

9 . A method for manufacturing an organic electroluminescence element by forming a light extraction layer, a transparent electrode, a light-emitting functional layer including a light-emitting layer, a counter electrode on one main surface of a transparent substrate in this order, wherein
the transparent substrate has a thickness of 3 μm or more and 50 μm or less, and the layered body configured by the transparent substrate and the light extraction layer has a bending property of generating no crack, when a surface region of 500 μm×500 μm of the light extraction layer is observed with a light diffraction microscope after a bending test is performed on the layered body configured by the transparent electrode and the light extraction layer under conditions of a radius of curvature of 5 mm, a bending angle of 180 degrees, and bending cycles of ten.

10 . The method for manufacturing an organic electroluminescence element according to claim 9 , the method comprising, in the formation of the light extraction layer, forming a scattering layer on the transparent substrate, and then, forming a smoothing layer which contains a resin material and an inorganic material having a refractive index of 2.0 or more on the scattering layer.

11 . The method for manufacturing an organic electroluminescence element according to claim 10 , wherein
a resin polymer using at least one of a urethane acrylate or an acryl resin acrylate is used as the resin material, and the resin polymer is formed by polymerization through light or heat, after formation of a coating solution containing a monomer or an oligomer on the scattering layer.

12 . The method for manufacturing an organic electroluminescence element according to claim 11 , wherein a light source used for the photo-polymerization is an excimer UV lamp.

13 . The method for manufacturing an organic electroluminescence element according to claim 9 , the method comprising, in the formation of the light extraction layer, forming the scattering layer having a sea-island structure by dispersing the light scattering material in a form of island on the transparent substrate, and then, forming a smoothing layer on the scattering layer.

Assignees

• Konica Minolta Inc

Inventors

• Takeda Akihiko
• Kuroki Takaaki

Classifications

• H01L51/0031

  Electricity · mapped topic

• H01L51/524

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• H01L51/0043

  Electricity · mapped topic