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Enhancing multiphoton upconversion through interfacial energy transfer in multilayered nanoparticles
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Enhancing multiphoton upconversion through interfacial energy transfer in multilayered nanoparticles
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Journal Article
Enhancing multiphoton upconversion through interfacial energy transfer in multilayered nanoparticles
2020
Overview
Photon upconversion in lanthanide-doped upconversion nanoparticles offers a wide variety of applications including deep-tissue biophotonics. However, the upconversion luminescence and efficiency, especially involving multiple photons, is still limited by the concentration quenching effect. Here, we demonstrate a multilayered core-shell-shell structure for lanthanide doped NaYF
4
, where Er
3+
activators and Yb
3+
sensitizers are spatially separated, which can enhance the multiphoton emission from Er
3+
by 100-fold compared with the multiphoton emission from canonical core-shell nanocrystals. This difference is due to the excitation energy transfer at the interface between activator core and sensitizer shell being unexpectedly efficient, as revealed by the structural and temperature dependence of the multiphoton upconversion luminescence. Therefore, the concentration quenching is suppressed via alleviation of cross-relaxation between the activator and the sensitizer, resulting in a high quantum yield of up to 6.34% for this layered structure. These findings will enable versatile design of multiphoton upconverting nanoparticles overcoming the conventional limitation.
Photon upconversion in nanoparticles is often limited by concentration quenching. The authors present a multi-layered particle approach that enables increased upconversion efficiency by reducing cross-relaxation, through spatial separation of activator and sensitizer.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
