Japan's Kyushu University, the most advanced Organic Optoelectronics Research Center (OPERA) announced that although the development of fluorescent materials, but the internal quantum efficiency is basically up to 100% of the OLED new light-emitting materials. Previously high internal quantum efficiency materials were limited to the use of rare metal phosphorescent materials, and new materials do not use rare metals. OPERA named the material "Hyperfluescence". OPERA person in charge, Kyushu University, Professor Anderson 1000 wave vector, said, "the material does not require phosphorescent material." A detailed paper has been published in Nature.
双色球连号走势图 OLED luminescent materials are divided into fluorescent materials and phosphorescent materials according to different luminescent principles. The fluorescent material will recombine (emit light) only when the exciton passes through the "one state" spin state. While the phosphorescent material will emit light via triplet spin states in addition to a heavy state. The internal quantum efficiency of the fluorescent material is 25% at the maximum, and the maximum of the phosphorescent material is 100%, since the singlet and triplet occur at a ratio of 1: 3. In fluorescent materials, the energy of triplet excitons is generally not used for luminescence, and almost all of them are lost by heat.
双色球连号走势图 This phenomenon is very different in the luminous efficiency of OLED devices is very obvious. Therefore, in the OLED display and OLED lighting development, the use of phosphorescent material ratio is increasing. An OLED element having a luminous efficiency of more than 50 lm / W can be realized by using a phosphorescent material in addition to the blue luminescent material. However, phosphorescent materials have many problems. (2) United States Universal Display (UDC) holds the basic patent of phosphorescent materials, when used to negotiate with the company; (3) the blue phosphorescent material of its (1) phosphorescent materials containing rare metals, materials are expensive; Light-emitting life is short, almost no practical materials, and so on.
Recently, the industry has found several although the fluorescent material but the internal quantum efficiency of more than 25% of the material. OPERA Anda Research is very concerned about this phenomenon, one of its light-emitting principle known as the "thermal activity of delayed fluorescence (TADF)", to improve its luminous efficiency of the material design has been studied.
TADF only in the exciton through a single state when the light, in the sense that it belongs to the fluorescent material. But the triplet excitons will "energize" into a singlet state upon heating. Thus, it is expected that all the excitons contribute to the light emission.
The Anda laboratory developed the principle of TADF internal quantum efficiency of 90% or more of the material. This is a low molecular weight material consisting of 5 to 9 benzene rings, which do not require rare metals and rare earth elements. OLED devices and displays using this material have also been tried. Alleged external quantum efficiency of 19% or more, obtained with the use of phosphorescent material components of the match results. Currently the most efficient is the green light-emitting material, but Anda said, "including dark blue, including almost all the color of light, new materials have been achieved realization of the prospect."
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