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(Ca1-χEuχ)Ga₂S₄ (χ = 0.10, 0.40, 0.70, 1.0) phosphors were synthesized from CaS, EuS, and Ga₂S₃ 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 (λmax) of the CL spectra changed gradually from 557 to 546 nm with increasing europium-ion mole fraction (χ) in the (Ca1-χEuχ)Ga₂S₄ phosphors. These bands were attributed to the transitions from the lowest energy level of the 4𝑓65d1 excited state to the 4𝑓7 (8S7/2) ground state of the Eu2+ 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 (Ca1-χEuχ)Ga₂S₄ phosphors was confirmed to be tunable.

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