Micro LED display technology has the advantages of high brightness, high contrast, high resolution, low power consumption, long life, etc., and is the next generation of display technology after LCD and OLED, but its large-scale commercialization faces the problem of immature technology and high cost.
One of the technical bottlenecks is how to achieve full color of Micro LEDs. Although several large transfer technology solutions such as elastic seal transfer and electrostatic transfer have solved these problems and achieved success, it is still a huge challenge to manufacture high-resolution full-color Micro LED displays that can meet AR/VR applications.
The technical route of using Blue Micro LED combined with quantum dot color conversion array is a feasible full-color solution. The preparation process of blue micro LEDs is mature and the cost is relatively low. Quantum dot color conversion technology only needs to manufacture a blue micro LED display with extremely high pixel density as a whole, and convert some of its blue pixels into red and green respectively through a patterned quantum dot color conversion array to achieve full-color display.
In addition, the quantum dot color conversion array can also serve as a color conversion layer for OLEDs and a color filter for LCDs to improve efficiency and color gamut.
Liang Jingqiu's team from the YingGuang Room of the Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, and Zhong Haizheng's team at Beijing Institute of Technology proposed the use of microporous array filling and polishing technology to pattern perovskite quantum dots, and produced a quantum dot color conversion array with a minimum size of 2 μm, and used the engraving process to realize the preparation of two-color quantum dot color conversion array.
The method proposed in this study has the advantages of low production cost, fast processing speed, flexibility and versatility, which provides a new idea for the patterning of perovskite quantum dots and proposes a feasible technical route for the industrialization of Micro LED.
The research results were published in Nanoscale with Micropore Filling Fabrication of high resolution patterned PQDs with a pixel size less than 5 μm and selected for Nanoscale's 2022 Hot Papers.
a. Preparation process of quantum dot color conversion array
b. Green patterned perovskite quantum dot array with pixel sizes of 40 μm and 6 μm circular circles
a-b, optical images of green/red quantum dot color conversion arrays on two-inch glass sheets under ultraviolet light excitation and their respective local magnifications,
c. The fluorescence image and its local enlargement map of changchun optical machine,
d. Alignment labeled fluorescent image, e-f, green/red quantum dot "CAS" word pattern
A. Two-color quantum dot color conversion array flowchart by engraving method; b. Two-color quantum dot array image with a single pixel size of 10 μm;
C. A two-color quantum dot array image with a single pixel size of 30×10 μm, with a scale of 200 μm
Source: Changchun Institute of Optics, Precision Mechanics and Physics
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