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Growth and characterization of L-threonine doped thiourea single crystals: an optical material

Single crystals of pure and L-threonine-doped thiourea, an organic nonlinear optical (NLO) material, were grown by slow evaporation technique at room temperature. The structure of the grown crystals was confirmed by powder X-ray diffraction analysis and the crystals belong to the orthorhombic structure. The UV-vis-NIR study was performed to reveal the optical behaviour of the grown crystals. The UV cut-off wavelength for the pure, 1 and 3 mol% LT-doped thiourea crystals were found to be 295 nm. The bonding structure and molecular associations due to chemical reactions were analysed and also the functional groups present in the crystals were identified using FTIR spectrum. Kurtz–Perry powder technique employing Nd:YAG laser was utilised to find the second harmonic generation efficiency of the grown pure and doped crystals which are found to be comparable to that of KDP.