Spectroscopic Study and Green Upconversion of SrY2(MoO4)4:Er~(3+)/Yb~(3+) Phosphors by Cyclic Microwave-Modified Sol-Gel Method

摘要

SrY2(MoO4)4:Er~(3+)/Yb~(3+) phosphors with doping concentrations of and Yb~(3+) (Er~(3+) = 0.05, 0.1, 0.2 and Yb~(3+) = 0.2, 0.45) have been successfully synthesized by a cyclic microwave-modified sol-gel method and green upconversion and spectroscopic properties have been investigated. Well-crystallized particles showed a fine and homogeneous morphology with particle sizes of 1-3 μm. Under excitation at 980 nm, SrY2(MoO4)4:Er~(3+)Yb~(3+) particles exhibited a strong 525 nm emission band, a weak 550 nm emission band in the green region and a weak 655 nm emission band in the red region. The Raman spectra of SrY_(1.8)(MoO4)4:Er_(0.2), SrY_(l.7)(MoO4)4:Er_(0.1),Yb_(0.2) and SrY_(1.5)(MoO4)4:Er_(0.05)Yb_(0.45) particles indicated the domination of strong peaks at higher frequencies (1025, 1082 and 1297 cm~(-1)) and at lower frequencies (224, 297, 357, 410, 534 and 575 cm~(-1)).