Journal
NANOSCALE
Volume 9, Issue 23, Pages 7941-7946Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr01403a
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Funding
- NSF of China [11374297, 61575194, 11674316, 11504371, 11604331]
- Science and Technology Agency, Jilin Province [20170520113 JH, 20170520112JH, 20170519002JH]
- CAS of China
- KNAW of the Netherlands
- European Union [MSCA-ITN-2015-ETN]
- ISPIC [675742]
- Netherlands Organisation for Scientific Research [731.015.206]
- EU COST [1403]
- HRSMC Research fellowship
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It is generally accepted that a lanthanide ions based upconversion material follows an activator low doping strategy (normally <3 mol%), because of the restriction of the harmful concentration quenching effect. Here, we demonstrate that this limitation can be broken in nanostructures. Simply by using an inert shell coating strategy, the concentration quenching effect for the activator (Er3+) could be eliminated and highly efficient upconversion luminescence realized in the activator fully doped nanostructure, e.g. NaErF4@NaYF4. More importantly, this novel nanostructure achieves some long-cherished desires, such as multiple-band co-excitation (similar to 800 nm, similar to 980 nm and similar to 1530 nm) and monochromic red emission. Proof-of-concept experiments are presented of the potential benefit of this structure in solar cells and anti-counterfeiting. This nanostructure offers new possibilities in realizing high upconversion emission and novel functionalities of lanthanide based nanomaterials.
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