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>> Taiwan's Tsinghua University develops new OLED materials 23th,March,2018
Professor Zheng Jianhong, Professor of Chemistry Department of Tsinghua University, Professor Liu Ruixiong, and Professor Lin Jiongwu of Materials Department made a breakthrough in the “New Dual Boron Material Masterpiece”, featuring low power consumption, high power, and slow power attenuation. The study has been published in the National Nature Photonics. .
Commercial applications of organic light-emitting diodes (OLEDs) have become increasingly sophisticated, including the use of OLED panels in many mobile phones. However, the luminous efficiency of commercially available fluorescent materials OLEDs is about 5%, and the use of rare metals is very expensive, although phosphorescent materials are 20%. Professor Zheng Jianhong, Professor of Chemistry Department of Tsinghua University, and Professor Liu Junxiong of the Department of Materials, together with Lin Junwu, a professor of materials, have made breakthroughs in the “new type of dual boron material masterpiece”, featuring low power consumption, high power and slow power attenuation, and the research has already reached the Nature Journal of international journals.
Organic Light-Emitting Diodes (OLEDs) are light, thin, self-illuminating, planar light sources, and colorful. They have a wide range of commercial applications, including mobile phone screens, high-definition displays, and lighting fixtures. The industry competition is fierce. OLED panel technology is currently available from South Korea’s Samsung and LG. Companies such as China, Huihui, and Huaxingguang have invested heavily in patented technologies, and Taiwan has fallen far behind South Korea in the development of OLEDs.
The commercially available OLED light-emitting layer is composed of a first-generation fluorescent material or a second-generation phosphorescent material. The light-emitting efficiency is about 5% and 20%, respectively. However, the second-generation phosphorescent material must use expensive metal ruthenium and platinum. Less laboratories actively develop third-generation materials, with heat-activated delayed fluorescence as the mainstream, and with low-cost pure organic materials, the luminous efficiency is comparable to that of phosphorescent components, but it suffers serious efficiency degradation problems under high brightness. Commercially available OLEDs have poor luminous efficiency and some are expensive.
Therefore, there are many labs developing third-generation luminescent materials, "thermally activated delayed fluorescence," consisting of low-cost, pure organic materials. The efficiency of the device can overcome the limitations of conventional fluorescent inefficiencies and rival the performance of high-efficiency phosphorescent devices, but at high brightness, A serious efficiency decline has been encountered.
The team of Qing Datong team through the shape of rod-like molecules, so that the material tends to be horizontally arranged under the thermal evaporation, improve the efficiency of the light output of the component, and also break through the limitations of the traditional quantum efficiency of the fluorescence and phosphor-selected OLED, with the process and variable angle spectrometry The technology produces ultra-high-efficiency green OLEDs with 38% external quantum efficiency, and also features low-efficiency attenuation.
Zheng Jianhong said that at present, many rare metals are used in OLED processes and the cost is higher. However, the use of this technology is characterized by lower cost of organic materials, more low power consumption, high power, slower attenuation of efficiency, etc. Currently, it is also active in the sea. Internal and external manufacturers to discuss technology transfer.
Zheng Jianhong said that this new type of double boron material has the third generation of thermally activated delayed fluorescence characteristics, and the shape of the rod-shaped molecules makes the material under the thermal evaporation tends to be horizontally arranged while improving the efficiency of the device's light output, and the device structure breaks through the conventional fluorescent and phosphorescent OLED exteriors. Quantum efficiency restrictions.
Liu Ruixiong, the head of the College of Science, said that it is expected that related products will be available in about five years.
The team's research and development achievements will be developed by Liu Ruixiong's "Forwarding Material Foundation and Applied Science Center" program, and the development of material derivation and OLED life testing will be developed. Liu Ruixiong pointed out that it is expected that related products will be available in about five years, and he is confident that the competitiveness will not be a product of MicroLEDs.
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