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    Using semi-polarized Micro LED, breakthrough in full-color quantum dot conversion technology
    Hits:   Date:2020-05-26  
    Micro LED is regarded as the next generation display technology to replace TFT-LCD and OLED display. Based on the high efficiency of LED, the ideal Micro LED display has various advantages such as high pixels, high contrast, self-illumination, low energy consumption and long life, which are highly optimistic.

    However, the current Micro LED still faces many difficulties that need to be overcome, the most troublesome researcher and manufacturer is the mass transfer process (Mass transfer process), how to quickly and accurately red, blue and green LED chips in three colors Ground bonding to the driving circuit of the panel, and to overcome the challenges of different chip material characteristics, especially the red Micro-LED and fragile problems, so the mass transfer technology has not yet been able to achieve mass production solutions.

    Professor Guo Haozhong of Taiwan Jiaotong University and others, in collaboration with researchers from American start-up companies Saphlux, Yale University, and Xiamen University, have adopted the technology of semipolar Micro LED combined with quantum dot photoresist technology To produce a full-color Micro LED array with high color stability. Nitride powder. Related research results have been accepted by Photonics Research and will be published soon.

    The research team host Guo Haozhong said that in order to reduce the number of massive transfers, the team has long focused on the application of quantum dot fluorescent pink conversion technology, requiring only one color LED chip (blue light or near ultraviolet light) with different color quantum dots Phosphor powder can realize the function of full color, and the color rendering property of quantum dot phosphor powder is quite outstanding.

    The team used semi-polarized epitaxial technology to make LED chips. With the characteristics of semi-polarized materials, the phenomenon of wavelength shift (Wavelength-shift) of the LED light source itself was greatly reduced, and the problem of color shift was overcome; The second breakthrough in the is the use of quantum dot phosphor photoresist technology, which uses a special method to mix quantum dot phosphor and photoresist liquid with the traditional lithography process to meet the needs of large-scale production of color pixels. Replacing the method of separately transferring red, blue, and green LED chips greatly reduces the difficulty of the transfer process.