Scholarlink

<p>Designing ultraviolet (UV) nonlinear optical (NLO) crystals with non-centrosymmetric (NCS) structures, wide optical bandgaps, enhanced birefringence, and short second-harmonic generation (SHG) phase-matching wavelength is of profound significance but still very challenging. The search for such materials is mainly focused on all-inorganic and organic-inorganic hybrid systems while the all-organic compounds have long been neglected. Herein, we have successfully synthesized an all-organic UV NLO crystal, namely imidazole L-aspartate, (C<sub>3</sub>H<sub>5</sub>N<sub>2</sub>)<sup>+</sup>(L-OOCNH<sub>3</sub>CHCH<sub>2</sub>COO)<sup>−</sup>, which crystallizes in NCS <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> space group attributed to the use of chiral L-aspartic acid. To our surprise, the title compound exhibits wide optical bandgap (5.4 eV), short absorption edge (210 nm), and phase-matchable SHG response both in the visible and UV regime. Beyond these, the material is highly birefringent (Δ<i>n</i> = 0.12@550 nm) due to the inherent strong optical anisotropy of organic functional units, resulting in wanted short phase-matching wavelength of 245 nm. This compound also showed good thermal stability comparable to the semi-organic NLO crystals. These results provide novel perspectives into the advancement of wide bandgap UV NLO materials in all-organic compounds.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Designing an all-organic wide bandgap ultraviolet nonlinear optical crystal

  • 期刊论文

  • 发表日期：

    2025年6月30日

查看全文
  • Shanshan Chen,
  • Zhiyong Bai,
  • Liangmeng Zhu,
  • Tao Ouyang,
  • Xu Chen,
  • Shoufeng Wang,
  • Yanqiang Li,
  • Weiqi Huang,
  • Sangen Zhao,
  • Junhua Luo

摘要

Designing ultraviolet (UV) nonlinear optical (NLO) crystals with non-centrosymmetric (NCS) structures, wide optical bandgaps, enhanced birefringence, and short second-harmonic generation (SHG) phase-matching wavelength is of profound significance but still very challenging. The search for such materials is mainly focused on all-inorganic and organic-inorganic hybrid systems while the all-organic compounds have long been neglected. Herein, we have successfully synthesized an all-organic UV NLO crystal, namely imidazole L-aspartate, (C3H5N2)+(L-OOCNH3CHCH2COO)−, which crystallizes in NCS P212121 space group attributed to the use of chiral L-aspartic acid. To our surprise, the title compound exhibits wide optical bandgap (5.4 eV), short absorption edge (210 nm), and phase-matchable SHG response both in the visible and UV regime. Beyond these, the material is highly birefringent (Δn = 0.12@550 nm) due to the inherent strong optical anisotropy of organic functional units, resulting in wanted short phase-matching wavelength of 245 nm. This compound also showed good thermal stability comparable to the semi-organic NLO crystals. These results provide novel perspectives into the advancement of wide bandgap UV NLO materials in all-organic compounds.