Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 8, Pages 3115-3120Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b00775
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Funding
- Research Grants Council of Hong Kong [CityU 109413, 9041978]
- National Natural Science Foundation of China [21303149, 51332008]
- Science Technology and Innovation-Committee of Shenzhen Municipality [JCYJ20130401145617278]
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We describe the use of a layer-by-layer hierarchical nanostructure to exploit the synergy of different lanthanide ions for converting single wavelength excitation into emissions spanning the whole spectral region. By lining up a set of lanthanide ions with matched energy levels in a core-shell nanostructure, we demonstrate well-defined cascades of energy transfer that gives access to optical emissions from a large collection of lanthanide ions (Tb3+, Eu3+, Dy3+, Sm3+, Nd3+, Yb3+, and Er3+) after excitation into a common sensitizer of Ce3+ featuring a broad absorption. Through optimization of the nanoparticle structure and surface coating, high quantum yields of up to 90% are achieved. Our results highlight that the controlled energy cascades at nanometer scale provide new opportunities for applications such as fighting against counterfeiting and sensing small molecules.
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