In a study published in Nanoscale, a research group led by LIANG Jingqiu from Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) of the Chinese Academy of Sciences (CAS), and a research group led by ZHONG Haizheng from Beijing Institute of Technology (BIT), developed a micropore filling technology to fabricate high resolution quantum dot color converter (QDCC). Quantum dot color conversion technology is a feasible technical solution to realize full-color micro-LED display. This technology only needs to combine the blue micro-LED with a QDCC which can convert some of the blue pixels into red and green to achieve full-color display.
A QDCC with a minimum pixel size of 2 μm was fabricated by the micropore filling technology. This technology mainly includes two key steps of perovskite quantum dot filling and surface polishing. The pre-prepared perovskite quantum dot optical films were pulverized and dispersed to prepare quantum dot gel. The gel was then filled into the SU8 micropore mold fabricated by photolithography. After the gel solidified, the residual gel was removed by polishing. The QDCC with a pixel size of 60 μm exhibits high fluorescence uniformity of 3.22% ± 0.61%.
The micropore filling fabrication provides a flexible and versatile method to fabricate QDCC with potential advantages of low production cost and fast processing speed. It also provides a new idea for the patterning of perovskite quantum dots, and a feasible method for realizing full-color micro-LED display.
