Au 9+ swift heavy ion irradiation of Zn[CS(NH 2 ) 2 ] 3 SO 4 crystal: Crystalline perfection and optical properties

Abstract

a b s t r a c tThe single crystal of tris(thiourea)zinc sulphate (Zn[CS(NH 2 ) 2 ] 3 SO 4 ) was irradiated by 150 MeV Au 9+ swift heavy ions and analyzed in comparison with pure crystal for crystalline perfection and optical properties. The Fourier transform infrared and X-ray powder diffraction inferred that swift ions lead the disordering and breaking of molecular bonds in lattice without formation of new structural phases. High resolution X-ray diffraction (HRXRD) revealed the abundance of point defects, and formation of mosaics and low angle grain boundaries in the irradiated region of crystal. The swift ion irradiation found to affect the lattice vibrational modes and functional groups significantly. The defects induced by heavy ions act as the color centers and resulted in enhance of photoluminescence emission intensity. The optical transparency and band gap found to be decreased.

Structural, vibrational, optical, photoluminescence, thermal, dielectric, and mechanical studies on zinc (tris) thiourea sulfate single crystal: A noticeable effect of organic dye

“…[37] Moreover, previous reports on pure and dyed ZTS crystals documented luminescence bands at 348 and 416 nm (λ exc = 310 nm), 423 nm (λ exc = 358 nm), and 406 nm (λ exc = 249 nm) with a broad emission band between 370-500 nm. [20,53,56] The current PL study demonstrates the tremendous potential of UZTS crystals for applications in biochemical/biomedical systems for the detection of compounds. [57]…”

“…The appearance of luminescence bands at 408 and 416 nm could be attributed to the presence of intrinsic defects. [52,53] The luminescence band at ∼ 448 ± 12 nm was induced by increased S 2− vacancies [54] or zinc interstitials. [55] This band was previously observed at 434 nm in ZTS and 433 nm in TYZTS.…”

Effect of phenol red dye on monocrystal growth, crystalline perfection, and optical and dielectric properties of zinc (tris) thiourea sulfate

“…The PL intensity of this band was enhanced with increasing dye content. The emission bands at $430 in pure and 447 in dyed crystals may be due to S 2À vacancies (Bhandari et al, 2014;Kushwaha et al, 2011Kushwaha et al, , 2014Rao & Kalainathan, 2012) in the ZTS crystals.…”