Abstract
Ce 3+ and Pr 3+ co−doped Lu 3 Al 5 O 12 phosphors were synthesized by the sol–gel process, and their crystal structure, photoluminescence (PL) properties, and energy transfer (ET) from the Ce 3+ to Pr 3+ were studied. The Lu 2.94− y Al 5 O 12 :0.06Ce 3+ , y Pr 3+ phosphors (0.002 ≤ y ≤ 0.008) showed the green−yellow emission from the 2 D 3/2 → 2 F 5/2, 7/2 transition of Ce 3+ and the red emission at 610 and 637 nm, which were caused by the 1 D 2 → 3 H 4 and 3 P 0 → 3 H 5 transitions of Pr 3+ , respectively. The optimal concentration of Pr 3+ for efficient ET was found to be x = 0.006. The electric quadrupole−quadrupole interaction was responsible for the concentration quenching in the Lu 2.94− y Al 5 O 12 :0.06Ce 3+ , y Pr 3+ phosphors, based on Dexter's theory. The incorporation of Pr 3+ for Lu 3+ enhanced the red PL intensity in the Lu 2.94 Al 5 O 12 :0.06Ce 3+ phosphor.
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