Journal
NANO LETTERS
Volume 15, Issue 8, Pages 5068-5074Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01184
Keywords
upconverting nanoparticle; optical tweezers; single particle fluorescence
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Funding
- Spanish Ministerio de Educacion y Ciencia [MAT2010-16161, MAT2013-47395-C4-1-R]
- Fondazione Cariverona (Verona, Italy) in the frame of the project Verona Nanomedicine Initiative
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We report on stable, long-term immobilization and localization of a single colloidal Er3+/Yb3+ codoped upconverting fluorescent nanoparticle (UCNP) by optical trapping with a single infrared laser beam. Contrary to expectations, the single UCNP emission differs from that generated by an assembly of UCNPs. The experimental data reveal that the differences can be explained in terms of modulations caused by radiation-trapping, a phenomenon not considered before but that this work reveals to be of great relevance.
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