Investigation on organic-inorganic hybrid NLO crystal L-Valine Potassium Penta Borate octa hydrate (LVPPB) for NLO applications

An organic-inorganic non linear optical (NLO) crystal L-Valine Potassium Penta Borate octa hydrate (LVPPB) single crystals were synthesized and grown by slow evaporation technique at ambient temperature. The single crystal X-Ray diffraction (XRD) analysis portrayed the monoclinic nature of the synthesized crystal. The UV-vis cut off wavelength was observed as 225 nm. The various functional groups CH3, CH, NH3 COO_, BO3, BO4 and KO in LVPPB were identified using the Fourier transform infrared (FTIR) technique. The thermogravimetric and differential thermal analysis (TG-DTA) thermogram was utilized to determine the thermal stability of the grown crystal. The work hardening co-efficient was calculated as 2, using microhardness study. The second harmonic generation (SHG) efficiency of the LVPPB was found to be 0.9 times that of KDP.