Enhancing Dye‐Triplet‐Sensitized Upconversion Emission Through the Heavy‐Atom Effect in CsLu 2 F 7 :Yb/Er Nanoprobes

Autor: Jiayao Li, Zhuo Chen, Jianxi Ke, Shan Lu, Yifan Pei, Peng Zhang, Datao Tu, Le Wang, Tianyong Guan, Xueyuan Chen, Xiaoying Shang
Rok vydání: 2021
Předmět:
Zdroj: Angewandte Chemie International Edition. 61
ISSN: 1521-3773
1433-7851
DOI: 10.1002/anie.202112125
Popis: Lanthanide (Ln3+ )-doped upconversion (UC) nanoprobes, which have drawn extensive attention for various bioapplications, usually suffer from small absorption cross-sections and weak luminescence intensity of Ln3+ ions. Herein, we report the controlled synthesis of a new class of Ln3+ -doped UC nanoprobes based on CsLu2 F7 :Yb/Er nanocrystals (NCs), which can effectively increase the intersystem crossing (ISC) efficiency from singlet excited state to triplet excited state of IR808 up to 99.3 % through the heavy atom effect. By virtue of the efficient triplet sensitization of IR808, the optimal UC luminescence (UCL) intensity of IR808-modified CsLu2 F7 :Yb/Er NCs is enhanced by 1309 times upon excitation at 808 nm. Benefiting from the intense dye-triplet-sensitized UCL, the nanoprobes are demonstrated for sensitive assay of extracellular and intracellular hypochlorite with an 808-nm/980-nm dual excited ratiometric strategy.
Databáze: OpenAIRE
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