| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1487497 | Materials Research Bulletin | 2016 | 6 Pages |
•Upconversion PbGd2−x(MoO4)4:Er3+/Yb3+ phosphors were successfully synthesized.•Well crystallized morphology with particle sizes of 2–5 μm was developed.•Strong emissions were provided based on a 525-nm and 550-nm emission bands.•Highly modulated structure and unit cell shrinkage were discussed in detail.
Double molybdate of PbGd2−x(MoO4)4:Er3+/Yb3+ phosphors with the correct doping concentrations of Er3+ and Yb3+ (x = Er3+ + Yb3+, Er3+ = 0.05, 0.1, 0.2 and Yb3+ = 0.2, 0.45) were successfully synthesized by microwave sol–gel process. The highly modulated structure and the upconversion photoluminescence properties were investigated in detail. The synthesized particles, formed after heat-treatment at 900 °C for 16 h, showed a well ctystallized morphology with particle sizes of 2–5 μm. Under excitation at 980 nm, the PbGd1.7(MoO4)4:Er0.1Yb0.2 and PbGd1.5(MoO4)4:Er0.05Yb0.45 particles exhibited a strong 525-nm emission band, a weak 550-nm emission band in the green region, and a very weak 655-nm emission band in the red region. The Raman spectra of the doped particles indicated the disordered structures of PbGd2−x(MoO4)4 by the incorporation of the Er3+ and Yb3+ ions into the crystal lattice, which resulted in the highly modulated structure as well as a concentration quenching effect of Er3+ ions.
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