The Korea Research Foundation (KFRI) announced that Professor Yun Hongseok, of the National University of Hamba, has developed a high-speed transfer technology that efficiently transfers multilayer OLED films to the desired substrate by high-pressure gas injection The
The use of mechanical and physical methods for multi-layer film transfer, the first one-time film and the original substrate separation, and then combined with other substrates to produce the device. However, when the film and the original substrate separation, the film will be shredded or wrinkled, or the angle is pulled and can not be used, which is the current OLED transfer technology can not mass production reasons.
In this regard, Professor YunHongseok team developed a new technology, the use of gas jet based high-speed stripping technology, effectively control the OLED film and the bonding between the substrate. It has been found that the injection of gas near the sound velocity between the substrate and the OLED film can effectively reduce the adhesion between the film and the substrate, reduce the adhesion between the film and the substrate, and make it easy to remove the film from damage Peel off from the substrate.
The figure above shows a schematic diagram of the energy transfer process when the OLED multilayer film is transferred using a gas jet technique. The bottom of the glass as the original substrate, the top of the PET plastic for the transfer of the substrate, OTS molecules with ultrasonic jet technology, can reduce the film and glass substrate binding energy, the film and glass binding energy is less than the film and PET (Ea1 << Ea2), the OLED film attached to the PET substrate is easily stripped from the glass under the action of the gas jet energy Ejet to achieve the purpose of transfer.
"This study will enable the rapid fabrication of OLED devices because gas injection technology can efficiently transfer at the same time without damaging the OLED film.Using the solution method to produce an OLED film, the unit cost of production can be greatly reduced," explains Professor Yun Hongseok. The technology can now be widely used in OLED lighting and display areas, and even in the future applications of electronic devices such as solar cells and semiconductors.
The study was conducted under the auspices of the Korea Research Foundation's Basic Research Support Program and published in Nanoscale, a journal of nanomaterials.
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