ORGANIC ELECTROLUMINESCENT ELEMENT, ILLUMINATION DEVICE, AND DISPLAY DEVICE

摘要

This organic electroluminescent element includes: a light transmissive substrate; a light emitting stack including a first electrode, a light emitting layer, and a second electrode; and at least one light-outcoupling structure which has an uneven structure. The light emitting layer has a birefringence property with a higher refractive index in a direction parallel to a surface of the light transmissive substrate than a refractive index in a direction perpendicular to the surface of the light transmissive substrate. The uneven structure includes a plurality of protrusions which are individually allocated to some of planar matrix-like sections, and with regard to unit regions consisting of same number of sections of the planar matrix-like sections, a ratio of an area of one or more of the plurality of protrusions in a unit region is substantially constant in each unit region.

主权项

1. An organic electroluminescent element, comprising:
a light transmissive substrate; a light emitting stack including a first electrode being light transmissive, a light emitting layer, and a second electrode which are arranged in this order from the light transmissive substrate; and at least one light-outcoupling structure which is provided closer to a light-outcoupling side, defined as an opposite side of the first electrode from the light emitting layer, than the first electrode and has an uneven structure, the light emitting layer having a birefringence property which exhibits a higher refractive index in a direction parallel to a surface of the light transmissive substrate than a refractive index in a direction perpendicular to the surface of the light transmissive substrate, the uneven structure including a plurality of protrusions having substantially same heights which are individually allocated to some of planar matrix-like sections so that the planar matrix-like sections become uneven, and with regard to unit regions consisting of same number of sections of the planar matrix-like sections, a ratio of an area of one or more of the plurality of protrusions in a unit region to a total area of the unit region being substantially constant in each unit region.