Activation of the surface dark-layer to enhance upconversion in a thermal field

Zhou, J, Wen, S, Liao, J, Clarke, C, Abbas, S, Ren, W, Mi, C, Wang, F and Jin, D 2018, 'Activation of the surface dark-layer to enhance upconversion in a thermal field', Nature Photonics, vol. 12, no. 3, pp. 154-158.

Document type: Journal Article
Collection: Journal Articles

Title Activation of the surface dark-layer to enhance upconversion in a thermal field
Author(s) Zhou, J
Wen, S
Liao, J
Clarke, C
Abbas, S
Ren, W
Mi, C
Wang, F
Jin, D
Year 2018
Journal name Nature Photonics
Volume number 12
Issue number 3
Start page 154
End page 158
Total pages 5
Publisher Nature Publishing Group
Abstract Thermal quenching, in which light emission experiences a loss with increasing temperature, broadly limits luminescent efficiency at higher temperature in optical materials, such as lighting phosphors1-3and fluorescent probes4-6. Thermal quenching is commonly caused by the increased activity of phonons that leverages the non-radiative relaxation pathways. Here, we report a kind of heat-favourable phonons existing at the surface of lanthanide-doped upconversion nanomaterials to combat thermal quenching. It favours energy transfer from sensitizers to activators to pump up the intermediate excited-state upconversion process. We identify that the oxygen moiety chelating Yb3+ions, [Yb···O], is the key underpinning this enhancement. We demonstrate an approximately 2,000-fold enhancement in blue emission for 9.7 nm Yb3+-Tm3+co-doped nanoparticles at 453 K. This strategy not only provides a powerful solution to illuminate the dark layer of ultra-small upconversion nanoparticles, but also suggests a new pathway to build high-efficiency upconversion systems.
Subject Condensed Matter Modelling and Density Functional Theory
Radiation and Matter
Quantum Chemistry
DOI - identifier 10.1038/s41566-018-0108-5
Copyright notice © 2018 The Author(s).
ISSN 1749-4885
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