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Photoluminescence of β-Ba2ScAlO5: Eu3+ red emitting phosphors effectively activated by UV light
Ist Teil von
Journal of luminescence, 2022-05, Vol.245, p.118800, Article 118800
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Increasing the absorption capacity of trivalent rare-earth metal ions doped phosphors excited by ultraviolet (UV) light is a hot topic. Herein, a novel β-Ba2ScAlO5:Eu3+ red-emitting phosphor with strong absorption in the UV region was reported. The photoluminescence spectra show that β-Ba2ScAlO5:Eu3+ phosphor exhibited a broad charge transfer band ranging from 220 nm to 350 nm, and it can transfer the excited electrons to Eu3+ ions. A strong red emission peak of Eu3+ ions centered at 613 nm (5D0 → 7F2 transition) was observed under 300 nm excitation. The Judd-Ofelt intensity parameters Ω2 and Ω4 were calculated as 1.37 × 10−20 cm−2 and 0.14 × 10−20 cm−2, which indicates a higher asymmetry environment around Eu3+ ions. All experimental results suggest that β-Ba2ScAlO5: Eu3+ materials as red phosphors own potential for application in light-emitting diodes and optical temperature sensors.
•β-Ba2ScAlO5 is adopted as the host compound for down-conversion photoluminescence.•The phosphors can be effectively excited by UV light around 300 nm.•A broad charge transfer band is responsible for the effective energy transfer from host to Eu3+ ions.•High asymmetry environment around Eu3+ is revealed by the Judd-Ofelt intensity parameters.