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Title: Photon upconversion through triplet exciton-mediated energy relay
Authors: Han, Sanyang 
Yi, Zhigao 
Zhang, Jiangbin
Gu, Qifei
Liang, Liangliang 
Qin, Xian 
Xu, Jiahui 
Wu, Yiming 
Xu, Hui
Rao, Akshay
Liu, Xiaogang 
Issue Date: 17-Jun-2021
Publisher: Nature Research
Citation: Han, Sanyang, Yi, Zhigao, Zhang, Jiangbin, Gu, Qifei, Liang, Liangliang, Qin, Xian, Xu, Jiahui, Wu, Yiming, Xu, Hui, Rao, Akshay, Liu, Xiaogang (2021-06-17). Photon upconversion through triplet exciton-mediated energy relay. Nature Communications 12 (1) : 3704. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Exploration of upconversion luminescence from lanthanide emitters through energy migration has profound implications for fundamental research and technology development. However, energy migration-mediated upconversion requires stringent experimental conditions, such as high power excitation and special migratory ions in the host lattice, imposing selection constraints on lanthanide emitters. Here we demonstrate photon upconversion of diverse lanthanide emitters by harnessing triplet exciton-mediated energy relay. Compared with gadolinium-based systems, this energy relay is less dependent on excitation power and enhances the emission intensity of Tb3+ by 158-fold. Mechanistic investigations reveal that emission enhancement is attributable to strong coupling between lanthanides and surface molecules, which enables fast triplet generation (<100 ps) and subsequent near-unity triplet transfer efficiency from surface ligands to lanthanides. Moreover, the energy relay approach supports long-distance energy transfer and allows upconversion modulation in microstructures. These findings enhance fundamental understanding of energy transfer at molecule-nanoparticle interfaces and open exciting avenues for developing hybrid, high-performance optical materials. © 2021, The Author(s).
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-021-23967-3
Rights: Attribution 4.0 International
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