Organic light emitting diode, image display device and illuminating device

Abstract

A top-emission type organic light emitting diode includes a substrate, a cathodic conductive layer including at least 70% by mass of Ag, an organic electroluminescence layer that includes a light emitting layer containing an organic light emitting material, an anodic conductive layer formed from a transparent conductor, and a lattice structure, in which a plurality of concave portions are periodically and two-dimensionally arranged. The cathodic conductive layer is laminated on the substrate. The organic electroluminescence layer is laminated on the cathodic conductive layer. The anodic conductive layer is laminated on the organic electroluminescence layer. The concave portions are provided to the cathodic conductive layer at an interface between the cathodic conductive layer and the organic electroluminescence layer. The lattice structure is a triangular lattice structure.

What is claimed is: 
     
         1 . A top-emission type organic light emitting diode, comprising:
 a substrate;   a cathodic conductive layer comprising 70% by mass or more of Ag, wherein the cathodic conductive layer is laminated on the substrate;   an organic electroluminescence layer that includes a light emitting layer containing an organic light emitting material, wherein the organic electroluminescence layer is laminated on the cathodic conductive layer;   an anodic conductive layer formed from a transparent conductor, wherein the anodic conductive layer is laminated on the organic electroluminescence layer, and   a lattice structure, in which a plurality of concave portions are periodically and two-dimensionally arranged, wherein the concave portions are provided to the cathodic conductive layer at an interface between the cathodic conductive layer and the organic electroluminescence layer, wherein the lattice structure is a triangular lattice structure;   wherein the organic light emitting diode is configured to emit light at an extraction wavelength λ (nm), and the extraction wavelength λ (nm) and a distance p (nm) between centers of adjacent concave portions in the lattice structure are within a polygonal-shaped region defined by straight lines sequentially connecting the following coordinates A, B, C, D, E, F, G H, I, J, and A in a graph illustrating a relationship between the light extraction wavelength and the distance, wherein A (λ=450, p=258+W(½)), B (λ=500, p=319+W(½)), C (λ=600, p=406+W(½)), D (λ=700, p=484+W(½)), E (λ=800, p=561+W(½)), F (λ=800, p=493−W(½)), G (λ=700, p=425−W(½)), H (λ=600, p=353−W(½)), I (λ=500, p=262−W(½)), and J (λ=450, p=110−W(½)), in which W(½) represents a half width at half maximum of a light emitting peak in a spectrum of the light emitting material that constitutes the light emitting layer; and   a depth of the concave portions is 12 nm to 180 nm,   wherein the relationship between the extraction wavelength and distance between centers and the depth of the concave portions combine to enhance luminous efficiency.   
     
     
         2 . The top-emission type organic light emitting diode according to claim  1 ,
 wherein the shape of the concave portions is a truncated conical shape or a columnar shape on the substrate, and the depth is 15 nm to 70 nm.   
     
     
         3 . The top-emission type organic light emitting diode according to  claim 1 ,
 wherein the shape of the concave portions is a sinusoidal wave shape on the substrate, and the depth is 50 nm to 160 nm.   
     
     
         4 . An image display device, comprising:
 the top-emission type organic light emitting diode according to  claim 1 .   
     
     
         5 . An illuminating device, comprising:
 the top-emission type organic light emitting diode according to  claim 1 .