3 years ago

Delayed Fluorescence of Dyes Sensitized by Eu3+ Chelate Nanoparticles

Delayed Fluorescence of Dyes Sensitized by Eu3+ Chelate Nanoparticles
Leonid Yu. Mironov, Peter S. Parfenov, Yaroslav I. Lebedev, Anastasiya A. Metlenko, Anna V. Shurukhina
Dye-doped nanoparticles of Eu3+ chelate complexes with naphtoyltrifluoroacetone and 1,10-phenanthroline were synthesized using two different reprecipitation techniques. The nanoparticles were characterized by atomic force microscopy, absorption spectroscopy, steady-state, and time-resolved fluorescence spectroscopy. Fluorescent spectroscopy of chelate nanoparticles doped with Oxazine 170 and Nile blue dyes indicates that a single dye molecule efficiently quenches luminescence of more than a hundred chelates. The Eu3+ chelates have a significantly longer luminescence lifetime than organic dyes, which leads to the appearance of delayed dyes fluorescence with microsecond lifetimes. The fluorescence brightness of dye-doped chelate nanoparticles was determined to be 50 times higher than that of a single Rhodamine 6G molecule. The combination of high fluorescence brightness and long fluorescence lifetime of the dye-doped chelate nanoparticles is promising for time-gated applications.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b03648

DOI: 10.1021/acs.jpcc.7b03648

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