Enhancing the generating and collecting efficiency of single particle upconverting luminescence at low power excitation

Chenshuo Ma, Chunyan Shan, Kevin Park, Aaron T. Mok, Paul J. Antonick, Xusan Yang
2020 Nanophotonics  
Upconverting luminescent nanoparticles are photostable, nonblinking, and low chemically toxic fluorophores that are emerging as promising fluorescent probes at the single molecule level. High luminescence intensity upconversion nanoparticles (UCNPs) have previously been achieved by doping with high amounts of rare-earth ions using high excitation power (>2.5 MW/cm2). However, such particles are inadequate for in vitro live-cell imaging and single-particle tracking, as high excitation power can
more » ... ause photodamage. Here, we compared UCNP luminescence intensities with different dopant concentrations and presented more efficient (about seven times) UCNPs at low excitation power by increasing the concentrations of Yb3+ and Tm3+ dopants (NaYF4: 60% Yb3+, 8% Tm3+) and adding a core-shell structure.
doi:10.1515/nanoph-2019-0526 fatcat:kcsqovou4vfddgbzw2e4zksqn4