Preparation of SrGd2(MoO4)4:Er3+/Yb3+ Phosphors by the Microwave-Modified Sol-Gel Method and Their Upconversion Photoluminescence Properties

다국어 초록 (Multilingual Abstract)

SrGd2-x(MoO4)4:Er3+/Yb3 phosphors with 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 the cyclic microwave-modified sol-gel method, and their upconversion mechanism andspectroscopic properties have been investigated in detail. Well-crystallized particles showed a fine and homogeneous morphologywith grain sizes of 2-5 μm. Under excitation at 980 nm, SrGd1.7(MoO4)4:Er0.1Yb0.2 and SrGd1.5(MoO4)4:Er0.05Yb0.45 particles exhibiteda strong 525-nm emission band, a weak 550-nm emission band in the green region, and a very weak 655-nm emission bandin the red region. The Raman spectra of the doped particles indicated the domination of strong peaks at higher frequencies of1023, 1092, and 1325 cm−1 and at lower frequencies of 223, 2932, 365, 428, 538, and 594 cm−1 induced by the incorporation of theEr3+ and Yb3+ elements into the Gd3+ site in the crystal lattice, which resulted in the unit cell shrinkage accompanying a newphase formation of the [MoO4]2- groups.

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