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Research Article | Online First

Photosensitizer-assisted direct 2D patterning and 3D printing of colloidal quantum dots

Wenyue Qing1, Yilong Si1, Mingfeng Cai1, Likuan Zhou2, Longjia Wu2, Zhengwei Hou3, Dan Liu1, Xiaoli Tian1, Wangyu Liu1, Linhan Lin4, Hao Zhang1( )
Department of Chemistry, Center for BioAnalytical Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
TCL Research, Shenzhen 518067, China
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
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Graphical Abstract

Abstract

Direct photopatterning is a powerful strategy for patterning colloidal quantum dots (QDs) for their integration in various electronic and optoelectronic devices. However, ultraviolet (UV) exposure required for QD patterning, especially those with short wavelength (e.g., deep UV light), can degrade the photo-, and electroluminescence, and other properties of patterned QDs. Here we develop a photosensitizer-assisted approach for direct photopatterning of QDs with h-line (centered at 405 nm) UV light and better preservation of their luminescent properties. This approach uses a photosensitizer that can absorb the h-line UV light and transfer the energy to activate bisazide-based crosslinkers via Dexter energy transfer. Uniform, high-resolution (smallest feature size, 2 μm), and full-color patterns of red, green, and blue QD layers can be achieved. The patterned QD layers maintain up to ~ 90% of their original photoluminescent quantum yields, comparing favorably with those (< 60%) of QDs patterned without photosensitizers. We further extended the strategy to the direct three-dimensional (3D) printing of QDs. This photosensitizer-assisted approach offers a new way for direct two-dimensional (2D) photopatterning and 3D printing of colloidal QDs, with implications in building high-performance QD optoelectronic devices.

Keywords

direct photopatterningquantum dotsphotosensitizerDexter energy transferthree-dimensional (3D) printing

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Nano Research
DOI: 10.1007/s12274-024-6947-0
Cite this article:
Qing W, Si Y, Cai M, et al. Photosensitizer-assisted direct 2D patterning and 3D printing of colloidal quantum dots. Nano Research, 2024, https://doi.org/10.1007/s12274-024-6947-0
Topics:
Light emission NanocrystalsSemiconductor quantum dots

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Received: 03 July 2024
Revised: 06 August 2024
Accepted: 06 August 2024
Published: 30 August 2024
© Tsinghua University Press 2024
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