Abstract
(La1−xGdx)0.94PO4:Tb0.06 (0 ≤ x ≤ 1.0) green phosphors were synthesized by an ultrasonic spray pyrolysis process. The annealed (La1−xGdx)0.94PO4:Tb0.06 phosphors exhibited the formation of a single-phase oxide with the monoclinic monazite structure. Higher Gd3+ content yielded a smaller lattice parameter. The phosphors emitted green light due to the 5D4→7FJ (J = 3, 4, 5, and 6) transition of Tb3+ at 489 nm, 543 nm, 585 nm, and 621 nm, respectively. The predominant peak at 543 nm was nearly a single peak, which was responsible for the green color emission. Among the (La1−xGdx)0.94PO4:Tb0.06 phosphors, the strongest emission intensity was obtained for (La0.25Gd0.75)0.94PO4:Tb0.06.
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