Rigid crosslinker-assisted nondestructive direct photolithograph for patterned QLED displays
Zhong Chen1, Zhongwei Man2, Shichao Rao1
1Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing, 100044, China.
Light, Science & Applications
|July 24, 2025
Summary
We developed a new crosslinker, CPTA, for direct photolithography of colloidal quantum dots (QDs). This method preserves QD properties, enabling high-resolution patterning for advanced display applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Colloidal quantum dots (QDs) are promising for next-generation displays due to their luminescence.
- Direct photolithography is key for patterning QD devices but often degrades QD properties.
Purpose of the Study:
- To develop a nondestructive direct photolithography method for QDs.
- To improve the photophysical property preservation of patterned QDs.
Main Methods:
- Designed a novel crosslinker, CPTA, featuring a rigid cyclopentane bridging group.
- Utilized CPTA for high-resolution direct photolithography of QDs under ambient conditions.
Main Results:
- Achieved high-resolution RGB line and dot arrays with 1 μm pixel size and 6350 PPI resolution.
- Patterned QDs, especially red QDs, retained optical and optoelectronic properties.
- Fabricated patterned red quantum dot light-emitting diodes (QLEDs) with 21% EQE and 180,000 cd/m² luminance.
Conclusions:
- CPTA crosslinker design is crucial for nondestructive QD patterning.
- This approach enables advanced display applications using patterned QLED technology.
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