Patent ID: 8963133
Filing Date: 2015-02-24
Classification: H01L

Abstract:
1. An organic electroluminescent element, comprising: a reflective electrode; an organic electroluminescent layer including a light-emitting layer; a transparent electrode; and a light extraction structure between the reflective electrode and the organic electroluminescent layer, the structure being of a protruding shape having inclined portions whose widths gradually narrow from the reflective electrode toward a light extraction side, wherein: the light extraction structure is provided on the reflective electrode so as to surround a light-emitting region; in a cross section taken along a plane perpendicular to the reflective electrode where an angle of an inclination angle formed between the reflective electrode and each of the inclined portions is largest, the angle of the inclination angle is 23° or more to 33° or less, and a position having a largest thickness of the light extraction structure is positioned on the reflective electrode; and an inclined portion closer to the light-emitting region with respect to the position having the largest thickness of the light extraction structure and an inclined portion farther from the light-emitting region with respect to the position having the largest thickness of the light extraction structure are disposed on the reflective electrode.