Nlo materials pdf3/28/2023 ![]() ![]() Phosphorescence wavelengths of the four complexes were calculated with vertical and adiabatic methods. Experimental absorption bands were assigned on the basis of natural transition orbitales, and a good agreement with experience has been obtained. The electronic and geometrical structures of the S0 and T1 have been studied and compared. In this work, we studied the structural, optical, nonlinear optical properties, absorption spectra and phosphorescence properties of four cyclometalated heteroleptic iridium complexes with dFNppy = 5-nitro-2-(2′,4′-difluorophenylpyridyl, PPh3 = triphenylphosphine, L = Cl− (1), NCS− (2), NCO− (3) and N3− (4) using DFT and TD-DFT methods. To ensure its electrical property, dielectric and ac conductivity studies were made. The mechanical behavior and the associated parameters were estimated. It is observed from the TG–DTA studies that the crystal is stable up to 224 ☌. The good NLO second harmonic efficiency (1.1 times that of KDP) shows its suitability for device applications. The positive photoconductivity behavior of the crystal was observed in photoconductivity study. A strong emission due to f-d transition at 356 nm was observed in the photoluminescence spectrum. The functional groups, that were present in the sample, were identified by the FTIR spectrum. Synthesized crystal optical absorption was investigated by UV–Vis analysis. The powder X-ray diffraction analysis shows that the sample is in pure crystalline form. The single crystal X-ray diffraction study gives the unit cell parameters and confirms its triclinic system. The synthesized crystals were analyzed for their structural, optical, mechanical and electrical properties. The mixture of potassium hydrogen phthalate and L-Tartaric acid crystal was synthesized by slow evaporation method. The exploration of various properties of the results of grown ZnS-doped DAST crystals are utilized exclusively in the fields of optoelectronic and nonlinear optical (NLO) device applications. The thermogravimetric analysis exhibits good thermal stability such that 258.74 ☌ for pure and 259.41, 259.77, 258.94 ☌ for ZnSO4-dopant crystals which ensures that the high thermal stability than DAST crystal. The SHG studies revealed that the enhancement of second-order nonlinear efficiency of ZnSO4-DAST-dopant crystals (ZnS 1, ZnS 3) is 1.1, 1.4 times higher than DAST and SHG efficiency of ZnS 5-doped DAST crystal decreased due to deformation of crystal structure. The photoluminescent spectra revealed that the pure and ZnS-doped DAST crystals exhibiting green emission characteristics which help to fabricate the green LED. The lower cut-off wavelength of absorbance of ZnSO4-dopant crystals are 379, 380, 382 nm and of DAST is 388 nm which was analyzed by UV–Vis absorption spectra that reveals the improvement of optical effects. Further, we investigated the dopant effects on DAST with different device properties, the structural parameters of grown single crystals were analyzed through single X-ray diffraction, powder X-ray diffraction, energy dispersive X-ray analysis (EDAX). Further research on organic materials with excellent nonlinear optical properties and vigorous applied studies has been carried out.Optically enhanced organometallic ZnSO4-doped p-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) single crystal is grown by cost-effective solution growth slow evaporation technique. As one of the basic technologies of photonics, lightwave technology using organic nonlinear optical effects are important to develop. Nonlinear optical materials may be important for large-capacity communications, because further application of this material may provide a device in an all optical system. This is because organic materials show efficient nonlinear optical properties and rapid responsiveness based on highly movable -electrons, thanks to delocalized electrons in organic materials. ![]() In addition to these inorganic materials, organic nonlinear optical materials have also been studied. Since a laser oscillation was reported from an inorganic compound in the 1960s, inorganic nonlinear optical materials have been well developed. Nonlinear optical materials efficiently exhibit nonlinear optical phenomena, which are conversion of light wavelength, amplification of light, and conversion of the refractive index depending on optical intensity. Further development of optical materials is urgently required. Advancements of lasers and optical fibers contributed to optical communications and optical disks for practical use. ![]()
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