G. Vinitha

TL;DR: In this paper, a novel organic nonlinear optical (NLO) crystal, isonicotinamidium picrate (ISPA), was synthesized and grown by the slow evaporation method.

Abstract: Optically active single crystals of L -phenylalanine D -methionine (LPDM) were grown by slow evaporation technique by co-crystallization of amino acids L -phenylalanine and D -methionine in water. The unit cell dimensions have been identified from single crystal X-ray diffraction technique. The existences of various hydrocarbyls were examined by FTIR and FT-Raman spectroscopy. The carbon and hydrogen environment of the grown crystals were analyzed by FT NMR spectrum. The optical absorption studies show that the crystal is transparent in the visible region with a lower cut-off wavelength of 259 nm and there by optical band gap energy E g is calculated to be 5.35 eV. The Urbach energy, extinction coefficient, reflectance were calculated from UV-absorption data. Further, the thermal stability and accurate melting point has been investigated by TG/DSC techniques. The Kurtz powder SHG was confirmed using Nd:YAG laser with fundamental wavelength of 1064 nm. The dielectric behavior of the specimen has been determined for various temperatures (313 K, 333 K, 353 K, 373 K) at different frequencies. Fluorescence study and the time resolved decay calculation was also performed for the LPDM crystal. Optical nonlinear susceptibility was measured in LPDM and the real and imaginary part of χ 3 was evaluated by Z-scan technique using open and closed apertures.

TL;DR: An organic conjugated chromophore dl -mandelic acid (DLMA) single crystal was synthesized and grown-up by means of slow evaporation technique.

TL;DR: In this article, the optical band gap of the?-BaB2O4 nanoparticle is estimated to be 59?eV and the presence of self trapped excitonic state (347?nm) was identified.

TL;DR: In this paper, an efficient nonlinear optical semiorganic material L -valinium L-valine chloride (LVVCl) was synthesized and grown up by means of slow evaporation process.