Synthesis, growth and investigation of structural, optical, photoluminescence and thermal studies on the ZnSO4-doped DAST crystal for NLO applications

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. 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). 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. The photoluminescent spectra revealed that the pure and ZnS-doped DAST crystals exhibiting green emission characteristics which help to fabricate the green LED. 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 thermogravimetric analysis exhibits good thermal stability such that 258.74 degrees C for pure and 259.41, 259.77, 258.94 degrees C for ZnSO4-dopant crystals which ensures that the high thermal stability than DAST crystal. 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.