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Luminescence properties and energy transfer of a color-tunable Y2GeO5: Bi3+, Eu3+ phosphor

Zhao, Wenyu ; Qi, Shimei ; Liu, Jun ; Fan, Bin

Journal of alloys and compounds, 2019-05, Vol.787, p.469-475 [Periódico revisado por pares]

Lausanne: Elsevier B.V

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  • Título:
    Luminescence properties and energy transfer of a color-tunable Y2GeO5: Bi3+, Eu3+ phosphor
  • Autor: Zhao, Wenyu ; Qi, Shimei ; Liu, Jun ; Fan, Bin
  • Assuntos: Crystal structure ; Dipole interactions ; Energy transfer ; Europium ; Luminescence ; Luminescence quenching ; Luminous efficacy ; Materials selection ; Optical materials and properties ; Optical properties ; Phosphors ; Quenching ; Thermal stability
  • É parte de: Journal of alloys and compounds, 2019-05, Vol.787, p.469-475
  • Descrição: A series of Y2GeO5: Bi3+, Eu3+ phosphors were synthesized via a solid state reaction. Their crystal structures and luminescent properties were investigated. Under the 295 nm excitation of Bi3+, the Y2GeO5: Bi3+, Eu3+ phosphors presented a purplish-blue broad band at 369 nm from Bi3+ and some typical f-f characteristic emissions of Eu3+. The optimum co-dopant concentration of Eu3+ ion is 2%. Luminescence quenching of Eu3+ ions was demonstrated to be quenching interaction of Eu3+-Eu3+ and the quenching of the 5D0 state by Bi3+ ions. Energy transfer from Bi3+ to Eu3+ in Y2GeO5 efficiently occurred and the dipole-dipole interaction is the major energy transfer mechanism. With the increasing concentration of Eu3+, the luminous efficacy of the radiation increases and the luminescence colors can be tuned from purplish blue to reddish-orange. The Y2GeO5: Bi3+, Eu3+ phosphors are potential candidate materials for application in UV chip based W-LEDs with excellent thermal stability (0.2708 eV). •Novel phosphors Y2GeO5: Bi3+, Eu3+ with tunable emitting from purplish blue to reddish-orange were synthesized.•Luminescence quenching was due mainly to the quenching of the 5D0 state by Bi3+ ions.•Y2GeO5: Bi3+, Eu3+ has potential application in UV-LED with excellent thermal stability.
  • Editor: Lausanne: Elsevier B.V
  • Idioma: Inglês
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