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An Ultra-Wide Bandgap Sulfonate with Two-Step Second-Harmonic Generation Switching.

Feiyuan Gong1, Yiran Zhang2, Guangfeng Wei1

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This summary is machine-generated.

Researchers developed a novel organic deep-ultraviolet (UV) transparent nonlinear optical (NLO) switch. This material exhibits multistate stability and external-stimuli responsiveness, overcoming previous limitations in UV transmission for photonics and sensing applications.

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Area of Science:

  • Materials Science
  • Photonics
  • Organic Chemistry

Background:

  • Nonlinear optical (NLO) switches are crucial for photonics and sensing.
  • Existing NLO switches have narrow bandgaps, limiting deep-ultraviolet (UV) transmission.
  • Developing deep-UV-transparent NLO materials is essential for advanced applications.

Purpose of the Study:

  • To report the first organic deep-UV-transparent NLO switch.
  • To investigate its thermally activated reversible switching behavior.
  • To understand the mechanism behind the structural transformation and NLO response.

Main Methods:

  • Synthesis and characterization of the organic NLO switch [NH(CH3)3][CH3SO3].
  • Temperature-dependent second-harmonic generation (SHG) measurements.
  • Single-crystal X-ray diffraction and mechanistic studies.

Main Results:

  • The material exhibits a thermally activated reversible two-step switching of SHG (low-, no-, and high-response states) from 293-428 K.
  • Achieved remarkable SHG contrasts spanning many orders of magnitude.
  • Demonstrated deep-UV transparency with SHG reaching 2.6 × KH2PO4 at 1064 nm, a new record.

Conclusions:

  • The novel organic NLO switch overcomes limitations in deep-UV transparency.
  • Its reversible switching is driven by temperature-induced structural transformations.
  • This material holds significant promise for deep-UV photonics and sensing applications.