Patent ID: 7786665
Filing Date: 2010-08-31
Classification: H01L

Abstract:
1. An organic electroluminescent device, comprising: an emission portion comprising a first electrode and a second electrode and an organic layer sandwiched between the first and second electrodes; and a diffraction grating disposed neighboring on the emission portion, the diffraction grating being constituted by a base material layer having recessed and projected portions on a surface thereof, and a medium deposited on the base material layer to bury the recessed portions of the recessed and projected portions, the diffraction grating having first regions and second regions, each of the first regions being a portion of a planar section of the base material layer and comprising a group of the recessed and projected portions, the second region being a portion of the planar section of the base material layer which includes the plurality of the first regions wherein the diffraction grating has different periodic axes over an entire region of the emission portion, and consisting of an aggregate of a plurality of the first regions, there being at least 5 pairs of recessed and projected portions within each of the first regions being arranged with two-dimensional periodicity in a same direction parallel with the substrate and with a primitive translation vector of a predetermined direction, the predetermined direction of the primitive translation vector of the recessed and projected portions of each of the first regions differing from each other, and the medium being a different material from that of a neighboring transparent electrode material.