Tsinghua University Uses Salt Water Inkjet to Print Micron Led, Which Can Create Flexible Mobile Pho

The research team led by Chen Xueshi, Professor of the Department of materials of Tsinghua University, uses brine as the "coating" of quantum dot materials to resist water and oxygen erosion. It can also uniformly print micron LEDs smaller than sand particles with inkjet. Printed on the plastic film, it can create all kinds of flexible high-resolution mobile phone and other electronic device screens. The R & D results are on the cover of the Journal of Applied Materials and interfaces of the American Chemical Society, It has applied for patents in the United States and Taiwan.

Qingda pointed out that in order to create a display with higher resolution, high brightness, ultra thin, flexible and long service life for use in wearable electronic device screens such as augmented reality (AR), virtual reality (VR) glasses and watches, all major mobile phone and panel manufacturers have invested heavily in R & D of micro meter led to replace the current OLED, However, to arrange millions of micro LEDs below 100 microns on the substrate involves the most difficult "massive transfer" technology.

Chen Xueshi said that many manufacturers use the "seal" method to move and paste millions of red, green and blue micro LEDs to the substrate one by one. However, as long as a few small spots are not adhered, bad spots will appear on the screen. Therefore, some operators think of using inkjet printing to arrange micron LEDs, so as to improve yield and save cost.

Chen Xueshi pointed out that after the quantum dot solution is ejected by the inkjet printer, there will be convection inside the droplet, pushing the material to the periphery, which can not be evenly distributed. "It's like a accidentally dropped coffee droplet, with a lighter color in the center and a darker color in the outer ring. This is the so-called coffee ring phenomenon."

Chen Xueshi's research team added salt water, that is, sodium chloride solution, to the quantum dot solution and successfully coated the quantum dots to form crystals. "It's like grabbing the quantum dots back and condensing them into a small dot evenly distributed". The quantum dots passing through the "coating" are also more stable.

It was Dr. he Shirong of the Institute of materials of Qingda who came up with the idea of "soaking salt water" for quantum dots. He observed from micrographs that the quantum dot materials without salt water dispersed into irregular shapes after being ejected by an inkjet printer. After adding salt water, the quantum dots will gradually shrink and polymerize into uniform and beautiful crystals.

Tsinghua University Uses Salt Water Inkjet to Print Micron Led, Which Can Create Flexible Mobile Pho 1

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