Various morphologies of Cu 2 S and Cu 2 MoS 4 were synthesized from an octahedral Cu 2 O template in the presence of various concentrations of sodium molybdate and thioacetamide by carrying out solvothermal reactions in an ethylene glycol solvent. The morphology varied from hollow octahedral Cu 2 S structures, through small pieces of P-Cu 2 MoS 4 , and finally to thin square-like plates of I-Cu 2 MoS 4 , depending on the concentrations of sodium molybdate and thioacetamide. The XRD data indicated that the Cu 2 MoS 4 structural phases changed from P42m to I42m the concentrations of sodium molybdate and thioacetamide increased.
Ca 1-x Eu x)Ga 2 S 4 (x = 0.10, 0.40, 0.70, 1.0) phosphors were synthesized from CaS, EuS, and Ga 2 S 3 via a solid-state reaction, and their crystal structures were investigated by X-ray diffraction analysis. Cathodoluminescence (CL) spectra of these phosphors under moderate electron-beam voltages from 4 to 10 kV were investigated to assess their applicability in carbon nanotube field-emission displays. The wavelength at maximum intensity (λ max) of the CL spectra changed gradually from 557 to 546 nm with increasing europium-ion mole fraction (x) in the (Ca 1-x Eu x)Ga 2 S 4 phosphors. These bands were attributed to the transitions from the lowest energy level of the 4f 6 5d 1 excited state to the 4f 7 (8 S 7/2) ground state of the Eu 2+ ions. The blue shift of this wavelength was interpreted on the basis of the crystal structures of the phosphors. The color of light emitted from the (Ca 1-x Eu x)Ga 2 S 4 phosphors was confirmed to be tunable.
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