Enhancing multiphoton upconversion through interfacial energy transfer in multilayered nanoparticles.

Nature Communications
Bin ZhouJiannian Yao

Abstract

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 NaYF4, where Er3+ activators and Yb3+ sensitizers are spatially separated, which can enhance the multiphoton emission from Er3+ 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.

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Citations

Jun 11, 2020·Photochemistry and Photobiology·Dinaer MulatihanYanjun Zhao
Aug 20, 2020·Nanoscale·Artiom SkripkaFiorenzo Vetrone
Jan 26, 2021·Frontiers in Chemistry·Shaoshan SuDeshmukh A Hakeem
Jun 20, 2021·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Qin LiJinliang Liu
Aug 18, 2021·Chemistry, an Asian Journal·Yiming WuXiaogang Liu

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Methods Mentioned

BETA
X-ray
transmission electron microscopy

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