Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 13, Pages 4893-4896Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja5013646
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Funding
- National University of Singapore [R-143-000-427]
- Ministry of Education [R-143-000-453]
- Singapore-MIT Alliance
- Agency for Science, Technology, and Research [R-143-000-366]
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We report the synthesis of luminescent crystals based on hexagonal-phase NaYF4 upconversion microrods. The synthetic procedure involves an epitaxial end-on growth of upconversion nanocrystals comprising different lanthanide activators onto the NaYF4 microrods. This bottom-up method readily affords multicolor-banded crystals in gram quantity by varying the composition of the activators. Importantly, the end-on growth method using one-dimensional microrods as the template enables facile multicolor tuning in a single crystal, which is inaccessible in conventional upconversion nanoparticles. We demonstrate that these novel materials offer opportunities as optical barcodes for anticounterfeiting and multiplexed labeling applications.
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