G. R. Dillip

Publications

• 2.02

  Impact points

  Effect of magnesium chloride on growth, crystalline perfection, structural, optical, thermal and NLO behavior of

  G.R. Dillip, G. Bhagavannarayana, P. Raghavaiah, B. Deva Prasad Raju

  Materials Chemistry and Physics. 04/2012;

  In the present study, single crystals of �-glycine possessing excellent non-linear optical properties were successfully grown at room temperature in the presence of magnesium chloride (MgCl2) for the first time by using the slow solvent evaporation method. The second harmonic conversion efficiency o... [more] In the present study, single crystals of �-glycine possessing excellent non-linear optical properties were successfully grown at room temperature in the presence of magnesium chloride (MgCl2) for the first time by using the slow solvent evaporation method. The second harmonic conversion efficiency of �- glycine crystal was determined using Kurtz powder technique with Nd:YAG laser and was found to be 6 times greater than that of the standard inorganic sample potassium dihydrogen phosphate (KDP). The crystalline perfection of the grown crystal was analyzed using high-resolution X-ray diffraction (HRXRD) rocking curve measurements. The grown crystal was subjected to single crystal XRD and powder XRD, which confirmed that the crystal has hexagonal structure and belongs to space group P31. Inductively coupled plasma optical emission spectrometry (ICP-OES) was carried out to quantify the concentration of Mg element in the grown �-glycine single crystal. Fourier transform infrared (FTIR) spectral studies were made to identify the functional groups. The optical band gap was likewise estimated for �-glycine crystal using UV–vis–NIR study. The optical measurements of �-glycine crystal helped to calculate the optical constants such as refractive index (n), the extinction coefficient (K), electric susceptibility (�c) and both the real (∈r) and imaginary (∈i) components of the dielectric permittivity functions of photon energy, which is essentially required to develop optoelectronic devices. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) were used to study thermal stability and decomposition point of the grown crystal.

• Growth and Characterization of Non-Linear Optical Material

  G.R. Dillip, C. Madhukar Reddy, B. Deva Prasad Raju

  Journal of Minerals & Materials Characterization & Engineering. 12/2011; 10(12):1103-1110.

  An organic nonlinear optical (NLO) single crystal has been synthesized by slow solvent evaporation technique from aqueous solutions of L-serine and sodium fluoride (NaF) at ambient temperature. The grown crystal was confirmed by single crystal X-ray diffraction analysis. The powder X-ray diffraction... [more] An organic nonlinear optical (NLO) single crystal has been synthesized by slow solvent evaporation technique from aqueous solutions of L-serine and sodium fluoride (NaF) at ambient temperature. The grown crystal was confirmed by single crystal X-ray diffraction analysis. The powder X-ray diffraction of the grown crystal was recorded and indexed. The functional groups of the grown crystals were determined by FTIR spectrum. The optical absorption study reveals that the transparency of the crystal in the entire visible region and the lower edge was found to be 258 nm. Relative powder second harmonic generation (SHG) efficiency of the grown crystal was tested by Kurtz and Perry powder technique using high intensity Nd:YAG laser operating at 1064 nm.
• 1.57

  Impact points

  Crystal growth and characterization of γ-glycine grown from potassium fluoride for photonic applications.

  G R Dillip, P Raghavaiah, K Mallikarjuna, C Madhukar Reddy, G Bhagavannarayana, V Ramesh Kumar, B Deva Prasad Raju

  Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. 05/2011; 79(5):1123-7.

  Single crystals of γ-glycine, an organic nonlinear optical material have been synthesized in the presence of potassium fluoride (KF) by slow evaporation technique at ambient temperature. The size of the grown crystal is up to the dimension of 12 mm×10 mm×8 mm. The γ-phase was confirmed by single cry... [more] Single crystals of γ-glycine, an organic nonlinear optical material have been synthesized in the presence of potassium fluoride (KF) by slow evaporation technique at ambient temperature. The size of the grown crystal is up to the dimension of 12 mm×10 mm×8 mm. The γ-phase was confirmed by single crystal X-ray diffraction, powder XRD and the FTIR analysis. Optical absorption spectrum reveals that the grown crystal has good optical transparency in the entire visible region with an energy band gap of 5.09 eV, which is an essential requirement for a nonlinear optical crystal. Thermal stability of the grown γ-glycine crystal was determined using the thermo gravimetric and differential thermal analyses. The NLO activity of γ-glycine was confirmed by the Kurtz powder technique using Nd:YAG laser and the grown crystal exhibits high relative conversion efficiency when compared to potassium dihydrogen phosphate (KDP).