Studies on the Growth, Optical, Thermal and Physical Properties of an Efficient Second Order Nonlinear Optical Organic Crystal: 2-Amino-5-Chloropyridinium-Trifluoroacetate for Optoelectronic and Photonic Device Applications

The novel organic single crystal 2-amino-5-chloropyridinium-trifluoroacetate (2A5CTFA) has been synthesized and grown successfully using methanol as solvent by continuousslow evaporation technique. The X-ray diffraction results reveals that the crystal 2-amino-5-chloropyridinium-trifluoroacetate crystallizes into monoclinic crystal system with the non-centrosymmetric space group P_c . The vibrational spectrum of the sample by FTIR and FT-RAMAN study confirms the characteristic functional groups of the 2A5CTFA crystal. The optical absorption spectrum shows 85% of transmittance in the entire UV-Vis-NIR region with cut-off wavelength at 345 nm. The crystal has a thermal stability of 137° C without any major weight loss in the TG curve. The photoluminescence spectrum of the crystal has a prominent violet emission peak centered at 388 nm. The dielectric behavior of the crystal measured with variousfrequencies at different temperatures reveals the normal behavior for optical materials. The second order NLO effect from the crystal is confirmed by the emission of green signal from the crystal upon tested with the aid of Kurtz powder analysis using Nd:YAG laser. The laser induced surface damage threshold value of the crystal is found to be 1.05 GW/cm² . Overall, the outlined properties of the grown crystal makes it suitablefor opto-electronic and nonlinearoptical device applications.