Effect of titan yellow dye on morphological, structural, optical, and dielectric properties of zinc(tris) thiourea sulphate single crystals

摘要

Zinc(tris) thiourea sulphate (ZTS) is as one of the potential candidates for nonlinear optical applications due to its high nonlinearity and excellent optical properties. The synthesis of pure and titan yellow dye doped ZTS has been done and good quality rod-like single crystals of size ～60 mm long and 2 mm diameter were grown through simplest and low cost route. The structural and vibrational analysis rules out any extra phase or change in structure of ZTS due to dye doping. Scanning electron microscope study reveals that the grown crystals are of good quality with rod-like morphology. Diffuse reflectance spectrum show a new absorption band at ～460 nm, which may be predicted as a signature of dye. The optical band gap was calculated to be 4.6 eV for pure and 4.5 eV for doped ZTS crystals. The violet-blue emission centered at 412 nm in pure and at 414 nm in doped crystals with an additional green emission bands at 528 nm with high intensity in the photoluminescence spectra were observed. The value of ε_1 is found to be enhanced from 10 (in pure) to 14 (in doped) crystals. The properties are enhanced due to dye doping and may be more useful than pure crystals in optoelectronic devices.