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 andgrown successfully using methanol as solvent by continuous slow evaporation technique. The X-ray diffraction resultsreveals that the crystal 2-amino-5-chloropyridinium-trifluoroacetate crystallizes into monoclinic crystal system with the noncentrosymmetricspace group Pc. The vibrational spectrum of the sample by FTIR and FT-RAMAN study confirms thecharacteristic functional groups of the 2A5CTFA crystal. The optical absorption spectrum shows 85% of transmittance inthe entire UV-Vis-NIR region with cut-off wavelength at 345 nm. The crystal has a thermal stability of 137° C without anymajor weight loss in the TG curve. The photoluminescence spectrum of the crystal has a prominent violet emission peakcentered at 388 nm. The dielectric behavior of the crystal measured with various frequencies at different temperaturesreveals the normal behavior for optical materials. The second order NLO effect from the crystal is confirmed by theemission of green signal from the crystal upon tested with the aid of Kurtz powder analysis using Nd:YAG laser. The laserinduced surface damage threshold value of the crystal is found to be 1.05 GW/cm2. Overall, the outlined properties of thegrown crystal makes it suitable for opto-electronic and nonlinear optical device applications.