Abstract
PbY 2− 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 using the microwave sol–gel method; their upconversion photoluminescence properties were investigated in detail. Well‐crystallized particles, formed after heat‐treatment at 900 °C for 16 h, showed a fine and homogeneous morphology with particle sizes of 2–5 µm. Under excitation at 980 nm, the PbY 1.7(MoO4 )4:Er0.1 Yb 0.2 and PbY 1.5(MoO4 )4:Er0.05 Yb 0.45 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 presence of strong peaks at higher and lower frequencies induced by disordered structures of PbY 2− x (MoO4 )4 by the incorporation of the Er3+ and Yb3+ ions into the crystal lattice, which resulted in the unit cell shrinkage accompanying the new phase formation of the MoO 4−x group.
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