Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 13, Pages 7041-7045Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202015273
Keywords
gradient doping; luminescence analysis; multiplexed encoding; upconversion
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Funding
- National Key R&D Program of China [2017YFA0207303]
- National Natural Science Foundation of China (NSFC) [22088101, 21725502, 51961145403, 21904023, 11974097]
- Research Program of Science and Technology Commission of Shanghai Municipality [20JC1411700, 19490713100, 20490710600, 20S31903700]
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This study achieved independent tuning of emission intensity and lifetime in near-infrared excitable upconversion nanoparticles through the study of sensitizer gradient doping structure, breaking the correlation between intensity and lifetime, and expanding the encoding capacity.
Luminescent materials with engineered optical properties have been developed for multiplexed labeling detection, where encoding capacity plays a pivotal role in the efficiency. However, multi-dimensional optical identities are usually not independent which essentially hinder the practical encoding numbers to access theoretical capacity. In this work, we carefully studied the sensitizer gradient doping structure in near-infrared (NIR) excitable upconversion nanoparticles (UCNPs) and managed to achieve independent emission intensity and lifetime tuning. With the orthogonally tunability, it breaks the constraint of intensity (k) and lifetime (n) correlation and expands the practical encoding number to theoretical value as (k+1)(n)-1 in binary encoding. This method can also be combined with previous lifetime engineering as well to realize high level multiplexing.
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