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Area of Science:

  • Materials Science
  • Optics
  • Crystallography

Background:

  • Potassium beryllium fluoroborate (KBBF) is a leading deep-ultraviolet nonlinear optical (NLO) material.
  • KBBF growth is limited by small crystal sizes and the use of toxic beryllium.
  • There is a need for new, safer, and more scalable deep-ultraviolet NLO materials.

Purpose of the Study:

  • To discover and characterize a novel deep-ultraviolet NLO material.
  • To address the limitations of KBBF regarding crystal size and elemental toxicity.
  • To explore alternative materials for advanced optical applications.

Main Methods:

  • Synthesis and crystal growth of potassium fluorinated borophosphate (KBPF).
  • Characterization using powder X-ray diffraction (PXRD), SEM, TG-DSC, FTIR, and UV-Vis-NIR diffuse reflectance.
  • Second-harmonic generation (SHG) analysis and single-crystal X-ray structure refinement.
  • First-principles calculations using density functional theory (DFT) for optical property evaluation.

Main Results:

  • Discovery of a novel anhydrous non-centrosymmetric alkali fluorinated borophosphate, KBPF.
  • KBPF exhibits a cut-off wavelength below 200 nm and a significant SHG effect.
  • KBPF crystals can be grown using cost-effective methods and show no detectable hygroscopicity.
  • Stronger interlayer bonds in KBPF facilitate the growth of larger crystals compared to KBBF.

Conclusions:

  • KBPF is a promising new deep-ultraviolet NLO material with advantages over KBBF.
  • The material's composition from common elements and cost-effective synthesis offer scalability.
  • KBPF's properties make it suitable for applications requiring deep-ultraviolet nonlinear optics.