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<p>A comprehensive investigation was conducted to validate the application of ammonium cobalt zinc sulphate hexahydrate (ACZS), Tutton’s salt, crystals for LED applications. Non-stoichiometric crystals of [(NH<sub>4</sub>)<sub>2</sub>Co<sub>0.69</sub>Zn<sub>0.31</sub>](SO<sub>4</sub>)<sub>2</sub>.6H<sub>2</sub>O (ACZS) were grown using a slow evaporation technique. The monoclinic crystal system and <i>P2</i><sub><i>1</i></sub><i>/c</i> centrosymmetric space group of the ACZS crystal were confirmed using single crystal X-ray diffraction analysis. [Co(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> or [Zn(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> octahedral geometry with the extensive H-bonding with SO<sub>4</sub><sup>2−</sup> ions and NH<sub>4</sub><sup>+</sup> ions resulted into a 3D supramolecular assembly H-bonded network. The chemical composition of the crystals was verified using the EDX analysis. FTIR and Raman spectra indicated the presence of the main functional groups. SEM analysis of the ACZS crystal indicated a uniform morphology. The ACZS crystal demonstrated prominent absorption bands in the visible region with a bandgap of 4.13&#xa0;eV. The crystal exhibited strong emission at 764&#xa0;nm upon irradiation at 510&#xa0;nm, validating its utilization in the development of LEDs. The chromaticity diagram indicated a yellowish-orange emission near warm white light. The EPR spectrum showed a complex peak, indicating the presence of octahedral [Co(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup>(d<sup>7</sup>). TG-DTG-DSC analyses provided information on the composition and components of the mixed cationic non-stoichiometric inorganic salt. Examination of laser-induced damage threshold analysis revealed that the crystal had a high damage threshold of 31.43 GW cm<sup>−2</sup>.</p>

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Structural, spectral, thermal analyses and radiation effect of non-stoichiometric Tutton’s salt crystal: [(NH4)2Co0.69Zn0.31](SO4)2.6H2O

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • N. Venkatachalam,
  • J. Christina Rhoda,
  • K. S. Nagaraja,
  • M. Prabhaharan,
  • C. Karnan

摘要

A comprehensive investigation was conducted to validate the application of ammonium cobalt zinc sulphate hexahydrate (ACZS), Tutton’s salt, crystals for LED applications. Non-stoichiometric crystals of [(NH4)2Co0.69Zn0.31](SO4)2.6H2O (ACZS) were grown using a slow evaporation technique. The monoclinic crystal system and P21/c centrosymmetric space group of the ACZS crystal were confirmed using single crystal X-ray diffraction analysis. [Co(H2O)6]2+ or [Zn(H2O)6]2+ octahedral geometry with the extensive H-bonding with SO42− ions and NH4+ ions resulted into a 3D supramolecular assembly H-bonded network. The chemical composition of the crystals was verified using the EDX analysis. FTIR and Raman spectra indicated the presence of the main functional groups. SEM analysis of the ACZS crystal indicated a uniform morphology. The ACZS crystal demonstrated prominent absorption bands in the visible region with a bandgap of 4.13 eV. The crystal exhibited strong emission at 764 nm upon irradiation at 510 nm, validating its utilization in the development of LEDs. The chromaticity diagram indicated a yellowish-orange emission near warm white light. The EPR spectrum showed a complex peak, indicating the presence of octahedral [Co(H2O)6]2+(d7). TG-DTG-DSC analyses provided information on the composition and components of the mixed cationic non-stoichiometric inorganic salt. Examination of laser-induced damage threshold analysis revealed that the crystal had a high damage threshold of 31.43 GW cm−2.