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BaGa4Se7: a new congruent-melting IR nonlinear optical material
Jiyong Yao1, Dajiang Mei, Lei Bai
1Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
Inorganic Chemistry
|September 25, 2010
Summary
A new barium gallium selenide compound, BaGa(4)Se(7), was synthesized and identified as a wide-band gap semiconductor. It shows significant nonlinear optical properties, making it a promising material for infrared applications.
Area of Science:
- Solid State Chemistry
- Materials Science
- Crystallography
Background:
- The search for novel semiconductor materials with advanced optical properties is crucial for technological development.
- Barium gallium selenides are relatively unexplored, presenting an opportunity for new material discovery.
Purpose of the Study:
- To synthesize and characterize a new compound, BaGa(4)Se(7), for the first time.
- To investigate its crystallographic, electronic, and optical properties, particularly its nonlinear optical (NLO) behavior.
Main Methods:
- Single crystal X-ray diffraction for structural determination.
- Optical absorption spectroscopy to determine band gap and absorption edges.
- First-principles calculations for electronic structure and NLO property prediction.
- Melting point determination.
Main Results:
- BaGa(4)Se(7) was successfully synthesized and crystallizes in the monoclinic space group Pc.
- It exhibits a wide band gap with optical absorption edges in the visible and infrared regions (0.47 μm and 18.0 μm).
- The material demonstrates a strong second harmonic generation (SHG) response (~2-3 times AgGaS(2)) at 1 μm, with calculated NLO coefficients d(11) = 18.2 pm/V and d(13) = -20.6 pm/V.
Conclusions:
- BaGa(4)Se(7) is a novel wide-band gap semiconductor with significant potential for NLO applications.
- Its strong SHG response and favorable optical properties make it a promising candidate for infrared optical devices.
