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A Deep-Ultraviolet Transparent Nonlinear Optical Hydrogen-Bonded Organic Framework.

Zichen Wang1, Xingxing Jiang2, Xiaoyang Wang3

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|December 22, 2025
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Researchers developed a novel deep-ultraviolet (UV) nonlinear optical (NLO) crystal, O3SCH2NH3, overcoming limitations in current NLO materials. This new material exhibits excellent deep-UV transparency and strong nonlinear optical properties due to its unique hydrogen-bonded organic framework.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Crystallography

Background:

  • Advanced optoelectronic applications require deep-ultraviolet (UV) nonlinear optical (NLO) materials.
  • Existing UV NLO materials face challenges due to limited microstructural options and alignment difficulties.

Purpose of the Study:

  • To report the first deep-UV transparent NLO crystal with a hydrogen-bonded organic framework.
  • To address the limitations in current UV NLO material development.

Main Methods:

  • Computation-guided unit-substitution strategy to design the crystal structure.
  • Synthesis of the O3SCH2NH3 crystal.
  • Characterization of optical properties, including deep-UV transparency, second-harmonic generation (SHG), and birefringence.
  • Theoretical calculations and crystal structure analysis.

Main Results:

  • The novel O3SCH2NH3 crystal exhibits deep-UV transparency below 170 nm.
  • It shows strong powder second-harmonic generation responses: 3.8 × KH2PO4 at 1064 nm and 0.7 × β-BaB2O4 at 532 nm.
  • Sufficient birefringence (Δn(1̅10) = 0.060 @ 546 nm) was observed.

Conclusions:

  • The uniform alignment of [O3SCH2NH3] primitives, facilitated by hydrogen bonding in the 3D organic framework, is key to the exceptional NLO performance.
  • O3SCH2NH3 represents a promising new material for deep-UV optoelectronic applications.