Growth, linear–non-linear optical, fluorescence, thermal and electrical studies of glycine-doped bis-thiourea cadmium formate crystal for electro-optic device applications

Abstract

In the present investigation, glycine has been doped in bis-thiourea cadmium formate (BTCF) and single crystal was grown by slow solution evaporation technique. The incorporation of glycine in BTCF crystal was confirmed by Fourier transform infrared (FTIR) analysis. The UV-visible transmittance spectrum of pure and doped BTCF crystals was recorded to comparatively analyse the optical transparency, optical bandgap and other optical constants. The third-order non-linear behaviour of grown crystals has been investigated at 632.8 nm using Z-scan technique, and vital third-order non-linear optical (NLO) constants were calculated. The second harmonic generation (SHG) efficiency of doped BTCF crystal is found to be 2.15 times that of KDP material. The fluorescence studies of doped BTCF crystal confirmed the red colour emission in the visible region. The thermal stability of grown crystals was determined by means of thermogravimetric analysis (TGA). The dielectric measurement studies were performed at room temperature. The surface morphology of doped BTCF crystal was analysed by scanning electron microscopy (SEM) technique.