Single Crystal For Optoelectronic Applications Research Articles

Experimental and quantum chemical investigation on imidazolium trifluoroacetate single crystal for optoelectronic applications

The nonlinear optical single crystal of imidazolium trifluoroacetate (ITF) was grown by the solvent evaporation technique. The crystal is subjected to various experimental characterizations such as X-ray diffraction, vibrational, optical, thermal and NLO analysis. In parallel, the molecular functional properties are explored by density functional theory. The inter and intramolecular charge transfer interactions stabilization energies are assessed from the NBO analysis. The material has more than 60% transmission in the entire visible region, and the melting point of the crystal is 143 °C. The HOMO–LUMO energy gaps and the molecular charge transfer properties are investigated by frontier molecular orbital analysis. The existence of intermolecular interactions in the crystal was quantitatively interpreted from the Hirshfeld surface analysis. The ITF crystal possesses 1.67 higher second harmonic generation efficiency compared to typical KDP material.

Exploration of key physical properties of Sanakaranarayan - Ramasamy (SR) grown GZS single crystal for optoelectronic applications

In present work, bulk size (∼5 cm in length and 2 cm in dia.) single crystal of glycine zinc sulfate (GZS) was harvested from Sanakaranarayan - Ramasamy (SR) technique. The harvested crystal was exposed to in-depth study of its physical properties such as: optical, nonlinear and mechanical. Moreover, the DFT is also applied to study the molecular geometry, optical and nonlinear characteristics. XRD study confirms the formation of GZS crystal which was further confirmed through vibrational analysis. Optical absorbance and transmittance measurements were carried out. The grown crystal was found to be ∼80% transparent in wavelength from 300 to 950 nm and the band gap was estimated to be ∼4.6 eV. The respective μtot and βtot values are obtained about 3.6 times and 15 times larger compared to urea which confirm the application of GZS in NLO devices. The robust chemical etching and mechanical properties has been studied by applying different models.

Growth and characterization of L-Glycine thiourea nonlinear optical single crystal for optoelectronic applications

l-Glycine thiourea single crystals have been grown by slow evaporation solution growth technique (SEST). The cell parameters were estimated from single crystal X-ray diffraction analysis and it was found that the material crystallized in the orthorhombic symmetry with space group P212121 and the theoretical data were estimated. The powder X-ray analysis proved its crystalline nature without the formation of secondary phases. The presence of functional groups and the nature of bonds appearing in the material were identified by FTIR spectroscopy. Optical constants were estimated by UV–Visible spectrum and the lower cut off wavelength was observed at 200 nm. The scanning electron microscope analysis has been carried out to determine the surface morphology of the grown crystal. Energy dispersive spectrum was done to confirm the composition of elements present in the title material. The second harmonic generation (SHG) efficiency was done by Kurtz powder technique and the conversion efficiency was compared with KDP crystal of the title compound. Third order nonlinear optical susceptibility was measured using z-scan technique and it was found that the crystal has a positive refractive index which is self focusing in nature. The obtained results showed that l-glycine thiourea crystals are potential materials for NLO device fabrication.

Surface enhanced raman spectroscopy studies on triglycine sulphate single crystals

Adsorption characteristics of triglycine sulphate (TGS) on silver (Ag) surface were investigated based on density functional theory calculations and surface enhanced Raman spectroscopy (SERS) technique. The single crystals of TGS were grown by slow evaporation method. Ag nanoparticles (Ag NPs) were prepared by solution combustion method and characterized. The calculated and observed structural parameters of TGS molecule were compared. Raman and SERS spectra for TGS single crystal were studied experimentally and validated theoretically. Frontier molecular orbitals (FMOs) analysis was carried out for TGS and TGS adsorbed on Ag surface. The second harmonic generation measurements confirm the nonlinear optical (NLO) activity of the TGS molecule. SERS spectral analysis reveals that the TGS adsorbed as tilted orientation on the silver surface. The theoretical and experimental results evidence the suitability of the grown TGS single crystal for optoelectronic applications.

Non-uniform Spectrum Sensing using Multicoset Sampling.

31Aug 2016 Effect of semiorganic additive on the growth and characterization of NLO properties of NaAP single crystals for optoelectronic applications. S. Shek Dhavud and J. Thomas Joseph Prakash. PG and Research Department of Physics, Jamal Mohamed College (Affiliated to Bharathidasan University), Trichy-20, Tamilnadu, India. PG and Research Department of Physics, Government Arts College (Affiliated to Bharathidasan University), Trichy-22, Tamilnadu, India.

Effect of semiorganic additive on the growth and characterization of NLO properties of NaAP single crystals for optoelectronic applications.

Effect of semiorganic additive on the growth and characterization of NLO properties of NaAP single crystals for optoelectronic applications.

Growth and characterization of metal ions doped l-serine NLO single crystals for optoelectronic applications

Single crystals of pure and metal ions (K+, Na+ and Li+) doped l-serine have been grown by slow evaporation solution growth technique (SEST). Energy dispersive X-ray analysis (EDAX) and inductively coupled plasma optical emission spectroscopy (ICP-OES) prove the incorporation of metal ions into the doped crystals. The lattice parameters have been obtained from single crystal X-ray diffraction (XRD) studies. The presence of functional groups is identified by Fourier transform infrared (FTIR) and FT-RAMAN analyses. The thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) reveal that the thermal stability of lithium doped l-serine crystal is enhanced. The mechanical properties have been studied by vicker's microhardness test. UV–vis-NIR spectroscopy shows that the percentage of transmission is increased in lithium doped l-serine crystals. Potassium and lithium ions doped l-serine crystals have enhanced second harmonic generation (SHG) efficiency indicating that these crystals are potential candidates for non linear optical (NLO) applications.

Band gap enhancement on metal chelation: Growth and characterization of cobalt chelated glycine single crystals for optoelectronic applications

Single crystals of Diaqua Bisglycine Cobaltous Chloride (DBGCoCl) have been synthesized and grown by slow evaporation method. Grown crystals were subjected to FTIR and XRD studies for structural confirmation. The DBGCoCl crystallizes in the monoclinic system with the space group P2 1/c. The UV–vis spectrum for the pure glycine as well the cobalt chelated glycine have been recorded. The lower cutoff wavelength observed from the UV–vis spectrum is found to decrease by the chelation of cobalt with glycine and this leads to an increase in the band gap of the compound from 3.13 eV to 4.91 eV. The optical constants were calculated and illustrated graphically. Mechanical hardness of the grown crystal DBGCoCl was studied and Vickers hardness number was calculated. The work hardening coefficient ( n) was determined to be 1.365 and the stiffness constants for different loads were calculated and reported. The thermal stability of the grown crystal has been studied using TGA and DTA. The crystal is thermally stable up to 116.86 °C.