Microwave sol-gel synthesis and upconversion photoluminescence properties of CaGd2(WO4)(4):Er3+/Yb3+ phosphors with incommensurately modulated structure | Научно-инновационный портал СФУ

Microwave sol-gel synthesis and upconversion photoluminescence properties of CaGd2(WO4)(4):Er3+/Yb3+ phosphors with incommensurately modulated structure

Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1016/j.jssc.2015.04.032

Ключевые слова: Double tungstate, Microwave sol-gel, Upconversion, XRD refinement, Raman, Crystal structure, Light emission, Luminescence, Phosphors, Photoluminescence, Quenching, Raman scattering, Sol-gel process, Sol-gels, Stretching, Tungsten compounds, Ytterbium, Concentration quenching, Double tungstates, Modulated structures, Photoluminescence properties, Synthesized particles, Up-conversion, XRD, Erbium

Аннотация: CaGd2-x(WO4)(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. The crystal structure of CaGd2-x(WO4)(4):Er3+/Yb3+ tungstates have been refined, and upconversion photoluminescence properties have been investigated. The synthesized particles, being formed after the heat-treatment at 900 degrees C for 16 h, showed a well crystallized morphology. Under the excitation at 980 nm, CaGd2(WO4)(4):Er3+/Yb3+ particles exhibited a strong 525-nm and a weak 550-nm emission bands in the green region and a very weak 655-nm emission band in the red region. The Raman spectrum of undoped CaGd2(WO4)(4) revealed about 12 narrow lines. The strongest band observed at 903 cm(-1) was assigned to the v(1) symmetric stretching vibration of WO4 tetrahedrons. The spectra of the samples doped with Er and Yb obtained under the 514.5 nm excitation were dominated by Er3+ luminescence preventing the recording of these samples Raman spectra. Concentration quenching of the erbium luminescence at H-2(11/2)-> I-4(15/2) transition is weak in the range of erbium doping level x(Er)=0.05-0.2, while, for transition S-4(3/2)-> 4I(15/2), the signs of concentration quenching become pronounced at x(Er)=0.2. (C) 2015 Elsevier Inc. All rights reserved.

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Издание

Журнал: JOURNAL OF SOLID STATE CHEMISTRY

Выпуск журнала: Vol. 228

Номера страниц: 160-166

ISSN журнала: 00224596

Место издания: SAN DIEGO

Издатель: ACADEMIC PRESS INC ELSEVIER SCIENCE

Авторы

  • Lim Chang Sung (Hanseo Univ, Dept Adv Mat Sci & Engn, Seosan 356706, South Korea)
  • Aleksandrovsky Aleksandr (SB RAS, LV Kirensky Phys Inst, Lab Coherent Opt, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Dept Photon & Laser Technol, Krasnoyarsk 660079, Russia)
  • Molokeev Maxim (SB RAS, LV Kirensky Phys Inst, Lab Crystal Phys, Krasnoyarsk 660036, Russia; Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia)
  • Oreshonkov Aleksandr (Siberian Fed Univ, Dept Photon & Laser Technol, Krasnoyarsk 660079, Russia; SB RAS, LV Kirensky Phys Inst, Lab Mol Spect, Krasnoyarsk 660036, Russia)
  • Atuchin Victor (SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia; Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia)

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