Switchable unidirectional emissions from hydrogel gratings with integrated carbon quantum dots

Chenjie Dai, Shuai Wan, Zhe Li, Yangyang Shi, Shuang Zhang () and Zhongyang Li ()
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Chenjie Dai: Wuhan University
Shuai Wan: Wuhan University
Zhe Li: Wuhan University
Yangyang Shi: Wuhan University
Shuang Zhang: The University of Hong Kong
Zhongyang Li: Wuhan University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Directional emission of photoluminescence despite its incoherence is an attractive technique for light-emitting fields and nanophotonics. Optical metasurfaces provide a promising route for wavefront engineering at the subwavelength scale, enabling the feasibility of unidirectional emission. However, current directional emission strategies are mostly based on static metasurfaces, and it remains a challenge to achieve unidirectional emissions tuning with high performance. Here, we demonstrate quantum dots-hydrogel integrated gratings for actively switchable unidirectional emission with simultaneously a narrow divergence angle less than 1.5° and a large diffraction angle greater than 45°. We further demonstrate that the grating efficiency alteration leads to a more than 7-fold tuning of emission intensity at diffraction order due to the variation of hydrogel morphology subject to change in ambient humidity. Our proposed switchable emission strategy can promote technologies of active light-emitting devices for radiation control and optical imaging.

Date: 2024
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DOI: 10.1038/s41467-024-45284-1

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