Combustion synthesis and luminescent properties of red-emitting Ca4−xAl6WO16:xEu3+ phosphors and photoluminescence enhancement by Bi3+ co-doping

Abstract A series of Ca 4− x Al 6 WO 16 : x Eu 3+ and Ca 4− x − y Al 6 WO 16 : x Eu 3+ , y Bi 3+ red-emitting phosphors have been successfully synthesized by the combustion method and characterized with X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectra (EDS) and photoluminescence (PL). The results indicated that the samples were well crystallized with irregular lamellar-like shape and belonged to the tetragonal structure and space group P4c2. Photoluminescence spectra showed that the phosphors can be efficiently excited by near-UV light and exhibited a characteristic red luminescence corresponding to the electric dipole transition 5 D 0 → 7 F 2 at 618 nm. The emission intensity of Eu 3+ ions in the Ca 4 Al 6 WO 16 (CAWO) host largely enhanced with the concentration increasing of activator (Eu 3+ ) ion and sensitizer (Bi 3+ ) ion, and the emission intensity reached the maximum at x =0.4 and y =0.02 in Ca 4− x − y Al 6 WO 16 : x Eu 3+ , y Bi 3+ phosphor. Addition of Bi 3+ ions drastically improved Eu 3+ ions emission owing to its strong absorption of excitation energy and effectively energy transfer to Eu 3+ emission center. It is shown that Ca 4− x Al 6 WO 16 : x Eu 3+ phosphors are promising red-emitting candidates for near-UV LED-based solid-state-lighting (SSL).

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