کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1329005 | 1500105 | 2014 | 5 صفحه PDF | دانلود رایگان |
• Yttrium orthosilicate (Y2SiO5) powders were prepared by combustion synthesis.
• Cooperative upconversion is observed for the first time in Tb3+–Yb3+ doped Y2SiO5.
• Energy transfer and back-transfer rates between Tb3+ and Yb3+ pairs were estimated.
Frequency upconversion (UC) luminescence via cooperative energy transfer (CET) process between pairs of Yb3+ and Tb3+ ions was investigated in Tb3+:Yb3+:Y2SiO5 crystalline ceramic powders prepared by combustion synthesis. Surface morphology and structure of the powders were investigated by scanning electronic microscopy and X-ray powder diffraction. Photoluminescence experiments were performed in Tb3+-singly doped samples using ultraviolet light (λ=255 nm) and in Tb3+:Yb3+ co-doped samples using a near-infrared (NIR) diode laser (λ=975 nm). Upon excitation with the NIR diode laser, UC luminescence with an intense emission band centered at ~549 nm, corresponding to the 4f intraband 5D4→7F5 transition of Tb3+, along with less intense emission bands at ~490, ~590 and ~620 nm, corresponding to other 5D4→7FJ transitions, was detected. The CET rate was estimated by analyzing the dynamics of UC luminescence with rate equations model of the electronic populations.
Graphical AbstractLeft: Cooperative upconversion luminescence spectra of three powder samples prepared by combustion synthesis. Right: The SEM image of the powder showing that it consists of agglomerated flake-like shaped particles of various sizes. Full scale bar is 20 μm.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 211, March 2014, Pages 32–36