Patent Number: 7,786,665

Title: Organic electroluminescent device having a diffraction grating for enhancing light extraction efficiency

Abstract: An organic electroluminescent device is provided, which includes 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 having first regions and a second region, the first regions comprising a plurality of pair of recessed and projected portions, the plurality of pair of recessed and projected portions being periodically arranged and provided with a primitive translation vector of a direction, the second region comprising an aggregate of the first regions and located parallel with an emission surface of the organic electroluminescent device.

Inventors: Nakanishi; Tsutomu (Tokyo, JP), Hiraoka; Toshiro (Yokohama, JP), Fujimoto; Akira (Kawasaki, JP), Asakawa; Koji (Tokyo, JP), Saito; Satoshi (Yamato, JP)

Assignee: Kabushiki Kaisha Toshiba

International Classification: H01L 21/00 (20060101); H05B 33/22 (20060101); H01L 35/24 (20060101); H01L 29/08 (20060101)

Expiration Date: 8/31/12018