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A HTO-Type Nonlinear Optical Fluorophosphate with Ultrawide Bandgap
Shanshan Chen1,2,3, Zhiyong Bai1,2,3, Xianyu Song2
1College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350117, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|January 9, 2025
Summary
Researchers developed a new fluorophosphate with hexagonal tungsten oxides (HTO) topology, achieving an ultrawide bandgap for deep-UV applications. This material also shows promising nonlinear optical (NLO) properties.
Area of Science:
- Materials Science
- Solid State Chemistry
- Crystallography
Background:
- Hexagonal tungsten oxides (HTO) are researched for nonlinear optical (NLO) properties.
- Existing HTO compounds often have narrow bandgaps, limiting deep-ultraviolet (deep-UV) applications.
Purpose of the Study:
- To synthesize and characterize a new HTO-type fluorophosphate.
- To investigate its optical bandgap and NLO performance for potential deep-UV applications.
Main Methods:
- Crystal structure determination of the new fluorophosphate.
- Optical bandgap measurement (experimental and theoretical).
- Second-harmonic generation (SHG) testing.
Main Results:
- A novel fluorophosphate, (NH4)3[Sc3F5(PO4)](PO3F)2, with HTO topology was synthesized.
- An ultrawide experimental bandgap (> 6.2 eV) and theoretical bandgap (6.724 eV) were observed.
- A phase-matchable second-harmonic generation (SHG) response of approximately 0.65 × KDP was achieved.
Conclusions:
- The new fluorophosphate exhibits an ultrawide bandgap, overcoming limitations of previous HTO compounds.
- Its properties make it a promising candidate for NLO applications in the deep-UV region.
- This discovery opens avenues for designing new HTO-type NLO crystals with ultrawide bandgaps.
