Growth and characterization of a new semiorganic nonlinear optical crystal-Bis (thiourea) lithium chloride

Single crystals of a new semiorganic nonlinear optical material bis(tiourea) lithium chloride (BTLC) were successfully grown by slow evaporation solution growth technique. Chemical composition of the synthesized material was confirmed by elemental analysis. The BTLC crystals were characterized by powder diffraction analysis and the crystallite size was calculated. The presences of functional groups were identified through Fourier transform-infrared technique. The optical transparency was studied through UV-Vis spectrophotometer. The thermal stability of the crystal was determined from thermogravimetric and differential thermal analysis curve. The second harmonic generation behavior of BLTC crystal was tested by Kurtz-Perry powder technique. The fluorescence spectrum of the crystal was recorded and the optical band gap is about 2.3 eV.