KYUDAI NEWS KYUSHU UNIVERSITY CAMPUS MAGAZINE Spring 2013 No.24

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Creation of Third-generation Organic Electroluminescent DevicesAn organic electroluminescent device (EL) is a light-emitting diode in which organic compounds emit light when electrical current flows through them. The study of organic EL is a major part of organic semiconductor optoelectronics, contributing to the development of new devices. At OPERA (Center for Organic Photonics and Electronics Research, Kyushu University), we have pursued the development of the world’s first high-efficiency light-emitting molecules in a new class of materials—third-generation EL materials that are superior compared to conventional fluorescent and phosphorescent materials—under the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) of the Cabinet’s Office.The most efficient phosphorescent devices utilize organometallic compounds that contain the noble metal iridium; however, in our project, we created a highly-efficient, organic, iridium-free luminescent device based on thermally-activated delayed fluorescence (TADF), which is a new third-generation light-emitting mechanism that we term “Hyperfluorescence”. The merit of using organic compounds lies in the variety of possible molecular structures, and TADF materials are created by using this flexibility to the greatest extent. This discovery, previously considered impossible, was made during the course of a two-year project. We will pursue the acquisition of strategic intellectual property rights, which will become a precious resource for our country, and foster organic optoelectronics as the nuclei of a new generation of industries in Japan.Top Story2Kyudai News No.24From Basic Research to Creating Innovative Organic Electroluminescent Materials— OPERA's approach leads to publication in ‘Nature’—Center for Organic Photonics and Electronics Research KYUSHU UNIVERSITYOPERA

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