Abstract
Tb 3+-doped ZnMoO 4 green phosphor was synthesized by a co-precipitation method. The morphology and structure of the phosphor were characterized by Scanning electron microscopy (SEM) and X-ray diffraction (XRD). Photoluminescence (PL) spectra were also used to characterize the ZnMoO 4:Tb 3+ samples. The results show that ZnMoO 4:Tb 3+ phosphor has triclinic structure with diameters ranging from 1.0 to 2.0 μm. The obtained ZnMoO 4:Tb 3+ phosphor emits green light emission centered at 541 nm corresponding to the 5 D 4 → 7 F 5 transition of Tb 3+ when excited by 378 nm or 488 nm. The optimized concentration of Tb 3+ is 15 mol.% for the highest emission intensity at 541 nm, and the concentration quenching occurs when the Tb 3 + concentration is beyond 15 mol.%. The concentration quenching mechanism can be interpreted by the quadrupole–quadrupole interaction of Tb 3+ ions. The present work suggests a convenient, cost-effective method for green phosphor, which may lead to potential applications in white light-emitting diodes (WLED).
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