Enhancing multiphoton upconversion through interfacial energy transfer in multilayered nanoparticles

Bin Zhou, Bing Tang, Chuang Zhang, Changyun Qin, Zhanjun Gu, Ying Ma (), Tianyou Zhai and Jiannian Yao
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Bin Zhou: Huazhong University of Science and Technology
Bing Tang: Huazhong University of Science and Technology
Chuang Zhang: Chinese Academy of Sciences
Changyun Qin: Huazhong University of Science and Technology
Zhanjun Gu: Chinese Academy of Sciences
Ying Ma: Huazhong University of Science and Technology
Tianyou Zhai: Huazhong University of Science and Technology
Jiannian Yao: Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-14879-9

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