KYUDAI NEWS KYUSHU UNIVERSITY CAMPUS MAGAZINE Spring 2013 No.24

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The Industrialization of a New Organic Semiconductor Science The research field of organic semiconductor optoelectronics has just graduated from the basic research phase. It is expected that it will grow steadily through university–company cooperation and develop into a large industry. The core of the technology is developing new organic semiconductor materials. A new field of academic study and industry was created by combining organic chemistry and electronics. The development of new materials and devices will become the center of a thriving industry in the future, creating great economic value. Moreover, we expect that new devices and science will be created in a way that we do not anticipate during the study, producing high added value.Successful Development of Third-Generation Organic Electroluminescent Materials— The birth of Hyperfluorescence —At our center, we have succeeded in developing epoch-making new (third-generation) light-emitting organic electroluminescent materials, for which we expect to find applications in next-generation high-definition displays and lighting. At OPERA, we have paid attention to the basic science of EL and developed new organic light-emitting materials that can convert electric energy into light with almost perfect efficiency by means of a molecular design that decreases the energy gap between the singlet and triplet excited states, which control the exciton emission mechanism. Among the light-emitting organic EL materials, fluorescent (first generation) and phosphorescent (second generation) materials have long been used; in contrast, our research results show the achievement of both low-cost and highly-efficient light emission, and we consider this finding as the achievement of “dream” light-emitting materials that take full advantage of the flexibility of molecular design. We have termed the new light-emitting material from Kyushu University “Hyperfluorescent.” This discovery will lead to the realization of organic EL devices that possess ultimate luminous efficiency without using rare metals. These research results were published in the international scientific journal ‘Nature’.Center for Organic Photonics and Electronics Research KYUSHU UNIVERSITYOPERAKyudai News No.243Organic light emitting materials, CDCBs, that realize efficient TADFEmission mechanism via TADF following exciton generation

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