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Issue 45, 2017
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Intense red up-conversion luminescence and dynamical processes observed in Sc2O3:Yb3+,Er3+ nanostructures

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Abstract

The intense red up-conversion luminescence in Sc2O3:Yb3+,Er3+ synthesized using a biphasic solvothermal (ST) method was observed upon laser diode pumping at 980 nm. Compared with that found in the bulk sample synthesized using a solid state (SS) reaction at the same sintering temperature (700 °C), the green and red up-conversion luminescence are enhanced by a factor of 19.7 and 23.4, respectively. The relative red intensity of the sample prepared using the ST method at 700 °C for 2 h was enhanced up to 6.6 times compared to that obtained by the SS reaction method at 1600 °C for 6 h. On analyzing the spectral distribution, power dependence and decay curves of Yb3+, we revealed that the red emission of the Er3+:4F9/2 level in Sc2O3:Yb3+,Er3+ was populated via three possible routes, i.e. excited-state absorption (ESA), two-step energy transfer up-conversion (ET) and non-multiphonon relaxation mechanism from the (2H11/2, 4S3/2) via cross-relaxation and energy back transfer (CRB). For the green up-conversion of the Er3+:(2H11/2, 4S3/2) level, a three-photon process described as Yb3+:2F5/2 + Er3+:4F9/2 → Yb3+:2F7/2 + Er3+:2H9/2 occurs in the Sc2O3:Yb3+,Er3+ material. The results indicate that ST-Sc2O3:Yb3+,Er3+ can act as an efficient up-converting red light emitter and ST-Sc2O3 is an appropriate oxide host for up-conversion luminescence.

Graphical abstract: Intense red up-conversion luminescence and dynamical processes observed in Sc2O3:Yb3+,Er3+ nanostructures

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Publication details

The article was received on 11 Sep 2017, accepted on 24 Oct 2017 and first published on 24 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT03354K
Citation: Dalton Trans., 2017,46, 15954-15960
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    Intense red up-conversion luminescence and dynamical processes observed in Sc2O3:Yb3+,Er3+ nanostructures

    J. Jiu, X. An, J. Li, J. Leng, W. Lü, L. Chen and X. Wang, Dalton Trans., 2017, 46, 15954
    DOI: 10.1039/C7DT03354K

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