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- Title
Enhancing Dye‐Triplet‐Sensitized Upconversion Emission Through the Heavy‐Atom Effect in CsLu<sub>2</sub>F<sub>7</sub>:Yb/Er Nanoprobes.
- Authors
Zhang, Peng; Ke, Jianxi; Tu, Datao; Li, Jiayao; Pei, Yifan; Wang, Le; Shang, Xiaoying; Guan, Tianyong; Lu, Shan; Chen, Zhuo; Chen, Xueyuan
- Abstract
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 CsLu2F7: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 CsLu2F7: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.
- Subjects
PHOTON upconversion; YTTERBIUM; LUMINESCENCE; IONS; ABSORPTION; ATOMS; DIESEL multiple units
- Publication
Angewandte Chemie, 2022, Vol 134, Issue 1, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202112125