Effect of titan yellow dye on morphological, structural, optical, and dielectric properties of zinc(tris) thiourea sulph
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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 e1 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.
I. INTRODUCTION
Dye doped polymers and glasses have been used to fabricate solid state photonic devices. We believe that the growth of nonlinear optical (NLO) single crystals with dye doping may possess higher thermal conductivity, reduced scattering and intrinsic polarization. To match the demand of functional materials different kinds of materials have been developed and functionalized with exceptional optical and NLO properties. NLO materials are of pronounced importance due to their applications in various modern electronic and photonic devices.1–7 Currently the grown single crystals of NLO materials are used in devices like: data transformation, data retrieving, high data storage capacity, frequency doubling, frequency conversion, fast processing, and fusion research.7–10 Semiorganic materials have the capability for enhancing the optical nonlinearity and chemical flexibility of organics with the physical supremacy of inorganics.11,12 These materials also have the benefit of easy growth in aqueous solution to form bulk single crystals. Zinc(tris) thiourea sulphate, (Zn[CS(NH2)2]3SO4) (ZTS) is a good semiorganic material which displays good NLO properties and is useful in high-power lasers as frequency convertor and also it may be a superior alternative to Contributing Editor: Gary L. Messing a) Address all correspondence to this author. e-mail: [email protected]; [email protected] DOI: 10.1557/jmr.2016.116 1046
J. Mater. Res., Vol. 31, No. 8, Apr 28, 2016
potassium dihydrogen orthophosphate single crystals.13 The chemical structure of ZTS is shown below (a) (Scheme 1). The enhancement in the numerous crucial properties such as crystal growth rate, morphology, crystalline precision, optical transparency, band gap, second harmonic generation efficiency, laser damage threshold has been achieved due to some additives or do
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