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The auxiliary dopant developed by Kyushu University and the light-emitting principle of this time. The color is the luminescent color when it glows alone.
The fluorescent light-emitting dopant material used for the element and the spectrum at the time of light emission.
The OPERA, the state-of-the-art organic photoelectron research center of Kyushu University in Japan, announced the development of an organic EL device that emits fluorescent materials with 100% internal quantum efficiency. This is achieved by dispersing the "thermally active delayed fluorescence (TADF)" material previously developed by OPERA as a co-dopant in a light-emitting layer of a conventional fluorescent light-emitting organic EL device. Compared with the original TADF, organic EL materials and devices can be produced by a more versatile and simpler method, and also have the advantages of high device durability. OPERA head Anda Qianbobo is full of confidence in the newly developed technology, and even "being (external technical staff, etc.) as the ultimate technology of organic EL".
The light emitting layer of the organic EL device is generally combined with a host material that is excited by current to generate excitons and a dopant material that is directly related to light emission.
According to the author of the paper, OPERA's Nakano Koichi, the main material used in the luminescent layer of the organic EL device is "a common material used in conventional organic EL." The fluorescent material used as a light emitting material (dopant) is a blue light emitting TBPe, a green light emitting TTPA, an orange light emitting TBRb, and a red light emitting DBP, which are all common materials. If these materials are directly used, the external quantum efficiency of the organic EL device is only 3 to 4%.
OPERA added a TADF material as an auxiliary dopant to the light-emitting layer made of these materials, thereby increasing the external quantum efficiency, 13.4% for blue light, 15.8% for green light, 18.0% for orange light, and 17.5 for red light. %.
This technology can bring two major benefits. First, since the basic structure is a fluorescent material device that has a high degree of freedom in material design and has rich technical experience in device manufacturing, an organic EL device with high luminous efficiency can be more easily developed.
Another advantage is that it is expected to greatly improve the luminous lifetime of high luminous efficiency organic EL devices. This is because the role of the auxiliary dopant is to provide assistance for energy transfer between the host material and the dopant material. Since the dopant directly related to light emission is a fluorescent material having a higher electrochemical stability, the "driving durability of the device is significantly improved" (Kyushu University). (Reporter: Nozawa Tetsuru, Nikkei Electronics)
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