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Depleted Upconversion Luminescence in NaYF4:Yb3+,Tm3+ Nanoparticles via Simultaneous Two-Wavelength Excitation

Abstract

We report optical depletion of upconversion luminescence (UCL) in NaYF4:Yb3+,Tm3+ nanoparticles excited simultaneously by 980 nm and 1550 nm lasers. The UCL intensity is greatly depleted, while the downshifted emission at 1210 nm is obviously enhanced. The disturbances of 1550 nm photons on energy transfer between Yb3+ and Tm3+, cross relaxation (CR), thermal effect and stimulated emission depletion (STED) process are qualitatively evaluated. Our investigations verify that the unexpected depletion phenomena are governed by STED process. The power densities of 980 nm and 1550 nm lasers are both less than 100 W cm-2, which will greatly reduce the thermal effect and damage and extend the applications of such nanomaterials. These results provide keen insights into controlling emission colors in optical processes, and offer potential applications on multicolor display and STED nanoscopy.

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Publication details

The article was received on 06 Jan 2017, accepted on 14 Jun 2017 and first published on 14 Jun 2017


Article type: Paper
DOI: 10.1039/C7CP00099E
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Depleted Upconversion Luminescence in NaYF4:Yb3+,Tm3+ Nanoparticles via Simultaneous Two-Wavelength Excitation

    H. Zhang, T. Jia, L. Chen, Y. Zhang, S. Zhang, D. Feng, Z. Sun and J. Qiu, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP00099E

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