Microwave Sol–Gel Synthesis of CaGd2(MoO4)4:Er3+/Yb3+ Phosphors and Their Upconversion Photoluminescence Properties |
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Authors: | Chang Sung Lim Victor Atuchin Aleksandr Aleksandrovsky Maxim Molokeev Aleksandr Oreshonkov |
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Affiliation: | 1. Department of Advanced Materials Science and Engineering, Hanseo University, Seosan, Republic of Korea;2. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, Novosibirsk, Russia;3. Functional Electronics Laboratory, Tomsk State University, Tomsk, Russia;4. Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk, Russia;5. Laboratory of Coherent Optics, Kirensky Institute of Physics, Krasnoyarsk, Russia;6. Department of Photonics and Laser Technologies, Siberian Federal University, Krasnoyarsk, Russia;7. Laboratory of Crystal Physics, Kirensky Institute of Physics, Krasnoyarsk, Russia;8. Department of Physics, Far Eastern State Transport University, Khabarovsk, Russia;9. Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russia |
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Abstract: | CaGd2(MoO4)4:Er3+/Yb3+ phosphors with the doping concentrations of Er3+ and Yb3+ (x = Er3+ + Yb3+, Er3+ = 0.05, 0.1, 0.2, and Yb3+ = 0.2, 0.45) have been successfully synthesized by the microwave sol–gel method, and the crystal structure refinement and upconversion photoluminescence properties have been investigated. The synthesized particles, being formed after heat‐treatment at 900°C for 16 h, showed a well‐crystallized morphology. Under the excitation at 980 nm, CaGd2(MoO4)4:Er3+/Yb3+ particles exhibited strong 525 and 550‐nm emission bands in the green region and a weak 655‐nm emission band in the red region. The Raman spectrum of undoped CaGd2(MoO4)4 revealed about 15 narrow lines. The strongest band observed at 903 cm?1 was assigned to the ν1 symmetric stretching vibration of MoO4 tetrahedrons. The spectra of the samples doped with Er and Yb obtained under 514.5 nm excitation were dominated by Er3+ luminescence preventing the recording Raman spectra of these samples. Concentration quenching of the erbium luminescence at 2H11/2→4I15/2 and 4S3/2→4I15/2 transitions in the CaGd2(MoO4)4:Er3+/Yb3+ crystal structure was established to be approximately at the 10 at.% doping level. |
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