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Research Article

Perovskite quantum dot microarrays: In situ fabrication via direct print photopolymerization

Xiu Liu1,§, Jianjun Li1,§, Pingping Zhang2, Weitong Lu2, Gaoling Yang1,3( ), Haizheng Zhong2, Yuejin Zhao1( )
School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
MIIT Key Laboratory for Low Dimensional Quantum Structure and Devices, School of Materials Sciences & Engineering, Beijing Institute of Technology, Beijing 100081, China
MIIT Key Laboratory for Low Dimensional Quantum Structure and Devices, Beijing 100081, China

§ Xiu Liu and Jianjun Li contributed equally to this work.

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Graphical Abstract

Perovskite quantum dots (PQDs) microarrays with three-dimensional (3D) hemisphere morphology and strong photoluminescence are fabricated by combining the inkjet printing and in situ fabrication of PQDs during the photopolymerization of precursor ink, which is desirable for quantum dots color conversion (QDCC) applications. Large-area multicolor patterned pixelated microarrays with wide color gamut and high resolution are achieved through this in situ direct print photopolymerization method.

Abstract

Quantum dots color conversion (QDCC) is considered as a facial and versatile way to achieve full-color organic light emitting diode (OLED) and micro-LED display due to the wide color gamut performance and easy integration. However, the aggregation of QDs and coffee-ring effects after solvent evaporation lowers the light conversion efficiency and emission uniformity in QDs microarrays, raising blue-light leakage or optical crosstalk. Here, we report the fabrication of perovskite quantum dots (PQDs) microarrays by combining the inkjet printing and in situ fabrication of PQDs during the photopolymerization of precursor ink. The resulting PQDs microarrays exhibit three-dimensional (3D) morphology with hemisphere shape as well as strong photoluminescence, which is desirable for QDCC applications. We demonstrate the dominant role of ultraviolet (UV) curable precursors and surface functionalized substrate in controlling the shape of microarrays, where significantly increased contact angle (100°) and large height to diameter ratio (0.42) can be achieved. We further demonstrate the potential use of the in situ direct print photopolymerization method for fabricating large-area multicolor patterned pixel microarrays with a wide color gamut and high resolution. The fabrication of 3D PQDs microarrays opens up new opportunities in a variety of applications including photonics integration, micro-LED, and near-field display.

Keywords

quantum dotsperovskitein situ fabrication inkjet printingmicroarrays

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Nano Research
Volume 15 Issue 8,
August 2022
Pages 7681-7687
DOI: 10.1007/s12274-022-4466-4
Cite this article:
Liu X, Li J, Zhang P, et al. Perovskite quantum dot microarrays: In situ fabrication via direct print photopolymerization. Nano Research, 2022, 15(8): 7681-7687. https://doi.org/10.1007/s12274-022-4466-4
Topics:
Semiconductor quantum dots

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Received: 08 March 2022
Revised: 16 April 2022
Accepted: 21 April 2022
Published: 31 May 2022
© Tsinghua University Press 2022
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