Ultra-Narrow Linewidth Photo-Emitters in Polymorphic Selenium Nanoflakes

Date

2022-10-01

Author

Hussain, Naveed
Ahmed, Shehzad
Tepe, Huseyin U.
Huang, Kai
Avishan, Nardin
He, ShiJie
Rafique, Mohsin
Farooq, Umar
KASIRGA, TALİP SERKAN
Bek, Alpan
Turan, Raşit
Shahzad, Khurram
Wu, Hui
Wang, Zhiming

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Photoluminescence (PL) in state-of-the-art 2D materials suffers from narrow spectral coverage, relatively broad linewidths, and poor room-temperature (RT) functionality. The authors report ultra-narrow linewidth photo-emitters (ULPs) across the visible to near-infrared wavelength at RT in polymorphic selenium nanoflakes (SeNFs), synthesized via a hot-pressing strategy. Photo-emitters in NIR exhibit full width at half maximum (Gamma) of 330 +/- 90 mu eV, an order of magnitude narrower than the reported ULPs in 2D materials at 300 K, and decrease to 82 +/- 70 mu eV at 100 K, with coherence time (tau(c)) of 21.3 ps. The capping substrate enforced spatial confinement during thermal expansion at 250 degrees C is believed to trigger a localized crystal symmetry breaking in SeNFs, causing a polymorphic transition from the semiconducting trigonal (t) to quasi-metallic orthorhombic (orth) phase. Fine structure splitting in orth-Se causes degeneracy in defect-associated bright excitons, resulting in ultra-sharp emission. Combined theoretical and experimental findings, an optimal biaxial compressive strain of -0.45% cm(-1) in t-Se is uncovered, induced by the coefficient of thermal expansion mismatch at the selenium/sapphire interface, resulting in bandgap widening from 1.74 to 2.23 +/- 0.1 eV. This report underpins the underlying correlation between crystal symmetry breaking induced polymorphism and RT ULPs in SeNFs, and their phase change characteristics.

Subject Keywords

2D materials, hot-pressing, polymorphic phase-transition, selenium nanoflakes, ultra-narrow linewidth photo-emitters, STRUCTURAL PHASE-TRANSITIONS, 2D MATERIALS, PHOTOLUMINESCENCE, LUMINESCENCE, INFORMATION, STATE, RAMAN

URI

https://hdl.handle.net/11511/100412

Journal

SMALL

DOI

https://doi.org/10.1002/smll.202204302

Collections

Department of Physics, Article

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Citation Formats

N. Hussain et al., “Ultra-Narrow Linewidth Photo-Emitters in Polymorphic Selenium Nanoflakes,” SMALL, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/100412.