Red and Green Phosphors Glow on the Basis of Oxide Glass-Ceramics Doped with Eu³⁺ and Tb³⁺

Abstract:

Glass-ceramics phosphors were obtained by the introduction of the crystalline phase NaMg₃Sc (MoO₄)₅:Eu³⁺,Tb³⁺ in the glass composition 8SiO₂-20B₂O₃-5Lu₂O₃-31Bi₂O₃-36ZnO. The properties were characterized by X-ray diffraction (XRD), photoluminescence (PL) and photoluminescent excitation spectra (PLE). The XRD patterns were indicated NaMg₃Sc (MoO₄)₅:Eu³⁺,Tb³⁺ crystallize well with the novel structure type and were assigned to the triclinic phase (space group PĪ, Z = 6). Glass-ceramic phosphors are well-known and promising as solid electrolytes, laser, luminescent and other inorganic materials. Luminescent properties of the phosphors are performed at room temperature. The excitation spectra of Eu-doped phosphor present strong absorption at 300 nm and the sharp peaks in the 350-500 nm range. Under the 394 nm excitation, intense red emission peak at 616 nm corresponding to ⁵D₀→⁷F₂ transition of Eu³⁺ is observed in the emission spectrum. The luminescence property indicates that the local symmetry of Eu³⁺ ion has no inversion center. The excitation spectra of Tb-doped phosphor by monitoring wavelength at 546 nm shows the intense broad band from 260 to 420 nm and the line at 234 nm, which is mainly attributed to charge-transfer band transition in MoO₄^2- group, indicating the existence of energy transfer from MoO₄^2- to Tb³⁺ in the Tb³⁺:glass-ceramic. The measured emission spectrum of Tb-doped phosphor has intense green emission at 546 nm corresponding to ⁵D₄→⁷F₅ transition of Tb³⁺, with λ_ex=368 nm. The as-prepared phosphors may find potential applications in the field such as color displays, light-emitting diodes (LEDs) and optoelectronic devices.

• Periodical: Key Engineering Materials (Volume 670)
• Pages: 107-112
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.670.107
• Online since: October 2015
• Authors: Seseg Tsyretarova*, Nina M. Kozhevnikova, Nina S. Ereminа, Gennady M. Mokrousov
• Keywords: Europium Ions, Excitation and Emission Spectra, Oxide Glass-Ceramics, Phosphors, Terbium Ions

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