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Journal of Nanoparticle Research

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01.01.2013 | Research Paper

Laser heating effect on the power dependence of upconversion luminescence in Er³⁺-doped nanopowders

verfasst von: A. H. Li, Z. J. Sun, Q. Lü

Erschienen in: Journal of Nanoparticle Research | Ausgabe 1/2013

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Abstract

Under 980-nm laser diode excitation, a phenomenon on an over-2-slope in log(I)-versus-log(P) plot for red upconversion (UC) luminescence in Er³⁺-doped nanopowders is usually observed. Due to the existence of many energy-trapping centers on their surfaces, the laser heating effect is shown very prominently in these nanopowders. In this submission, the influence of laser heating on the power dependence of UC luminescence in NaGdF₄:Er³⁺/Yb³⁺@Citrate nanopowders is investigated. In the experimental works, sub-20-nm β-NaGdF₄:Er³⁺/Yb³⁺@Citrate nanoparticles were synthesized at 185 °C through a solvothermal route. Then we found that UC luminescence at 524 and 657 nm displayed an over-2-slope in log(I)-versus-log(P) plot. The over-2-slope for 524-nm UC luminescence can be well explained from the greater proportion of population at the ²H_11/2 level, which is thermally populated from the ⁴S_3/2 level, with increase of the excitation power. Cross relaxation of ²H_11/2 + ⁴I_13/2 → ⁴F_9/2 + ⁴I_11/2 is proposed to feed ⁴F_9/2 from ²H_11/2 levels, which explains the over-2-slope in log(I)-versus-log(P) plot for red two-photon UC luminescence.

Vorheriger Artikel Formation mechanism of CdS nanoparticles with tunable luminescence via a non-ionic microemulsion route

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Titel: Laser heating effect on the power dependence of upconversion luminescence in Er3+-doped nanopowders
verfasst von: A. H. Li
Z. J. Sun
Q. Lü
Publikationsdatum: 01.01.2013
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 1/2013
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-012-1377-4

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