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Optical materials composed of La 1-   p   -   q  Bi  p  Eu  q  O 0.65 F 1.7 ( p = 0.001-0.05, q = 0-0.1) were prepared via a solid-state reaction using La(Bi,Eu) 2 O 3 and NH 4 F precursors at 1050 °C for two hours. X-ray diffraction patterns of the phosphors were obtained permitting the calculation of unit-cell parameters. The two La 3+ cation sites were clearly distinguished by exploiting the photoluminescence excitation and emission spectra through Bi 3+ and Eu 3+ transitions in the non-stoichiometric host lattice. Energy transfer from Bi 3+ to Eu 3  + upon excitation with 286 nm radiation and its mechanism in the Bi 3+ - and Eu 3+ -doped host structures is discussed. The desired Commission Internationale de l'Eclairage values, including emissions in blue-green, white, and red wavelength regions, were obtained from the Bi 3+ - and Eu 3+ -doped LaO 0.65 F 1.7 phosphors.

Bi3+ and Eu3+ Activated Luminescent Behaviors in Non-Stoichiometric LaO0.65F1.7 Structure