Tunable near-infrared light emission from layered TiS₃ nanoribbons

Abstract

The low-dimensional light source shows promise in photonic integrated circuits. Stable layered van der Waals material that exhibits luminescence in the near-infrared optical communication waveband is an essential component in on-chip light sources. Herein, the tunable near-infrared photoluminescence (PL) of the air-stable layered titanium trisulfide (TiS₃) is reported. Compared with iodine particles as a transport agent, TiS₃ grown by chemical vapor transport using sulfur powder as a transport agent has fewer sulfur vacancies, which increases the luminescence intensity by an order of magnitude. The PL emission wavelength can be regulated in the near-infrared regime by thickness control. In addition, we observed an interesting anisotropic strain response of PL in layered TiS₃ nanoribbon: a blue shift of PL was achieved when the uniaxial tensile strain was applied along the b-axis, while a negligible shift was observed when the strain was applied along the a-axis. Our work reveals the tunable near-infrared luminescent properties of TiS₃ nanoribbons, suggesting their potential applications as near-infrared light sources in photonic integrated circuits.

Graphical abstract

Keywords

titanium trisulfide / near-infrared luminescence / S-vacancy / tunability / strain engineering

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Declarations

The authors declare that they have no competing interests and there are no conflicts.

Electronic supplementary materials

The online version contains supplementary material available at https://doi.org/10.1007/s11467-023-1376-1 and https://journal.hep.com.cn/fop/EN/10.1007/s11467-023-1376-1.

Acknowledgements

This work was supported by the National Key R&D Program of China (No. 2021YFA1200804), the National Natural Science Foundation of China (Grant Nos. 62274175, T2325025, and 61927813), Jiangsu Province Key R&D Program (Nos. BE2023009-5 and BE2021007-3), and the open Foundation of Key Laboratory of Nanodevices of Jiangsu Province (No. ZS2301). J. Wang acknowledges the support from the CAS Young Talent program under Grant No. E3291305. The authors are grateful for the technical support for the Vacuum Interconnected Nanotech Workstation (Nano-X) from Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences.

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