The structural, optical, and morphological properties of radio-frequency magnetron-sputtered Bi2MoO6:Eu3+ thin-film phosphors annealed at four different temperatures were investigated. All the Bi2MoO6:Eu3+ thin-film phosphors, regardless of the annealer temperature, crystallized in a monoclinic phase with two dominant (3¯41) and (341) peaks. The 700 °C heat-treated sample exhibited small grain islands in the initial stages of the grain-boundary formation, which changed to many polygon-shaped grains enclosed by distinct grain boundaries upon increasing the temperature to 1000 °C. Under 307 nm excitation, all the Bi2MoO6:Eu3+ thin-film phosphors exhibited a dominant 5D0→7F2 electric dipole transition (615 nm) of Eu3+ ions, and the asymmetry factors were greater than unity, indicating that numerous Eu3+ ions occupied sites with no inversion center. With an increase in the annealer temperature, the bandgap decreased and the emission color shifted from yellow to reddish-orange. These results confirm that the properties of the red-light-emitting Bi2MoO6:Eu3+ thin-film phosphors can be modulated by varying the annealer temperature.

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