Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 190, Issue -, Pages 274-282Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2017.08.035
Keywords
Crystal growth; Crystal structure; Dielectric properties; Optical properties; Luminescence
Categories
Funding
- Program for National Natural Science Foundation of China [51172111, 51402159]
- Project of Shandong Province Higher Educational Science and Technology Program [J14LA17]
- China Postdoctoral Science Foundation [2015M57073]
- Qingdao Postdoctoral Application Research Project [2015116]
- Taishan Scholar Program of Shandong Province, China
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The efficient organic nonlinear optical material 4-hydroxy benzaldehyde-N-methyl 4-stilbazolium tosylate (HEST) was grown from methanol by slope nucleation method combined with slow cooling (SNM-SC) for the first time. The optimum growth conditions based on the cooling rate was further investigated. The single crystal X-ray diffraction (XRD) revealed that the chromophores of HBST crystal make an angle of about 33 degrees with respect to the a-axis, which is close to the optimum of Terahertz(THz)-wave generation and electro-optics applications, NMR and FT-IR spectral studies have been performed to ascertain various functional groups present in the sample. Futhermore, the thermal stability and decomposition stages were analyzed through TG-DTA and DSC techniques. The dielectric constant and dielectric loss of HBST crystal have been studied. Critical optical properties like the absorption coefficient, refractive index, cut-off wavelength and band gap energy were calculated. Photoluminescence (PL) exication studies indicated green emission occured at 507 nm. All the results of HBST crystal make it a promising candidate in the fields of optoelectronic and the generation of THz. (C) 2017 Elsevier B.V. All rights reserved.
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