Research Article
Visible Discrimination of Broadband Infrared Light by Dye-Enhanced Upconversion in Lanthanide-Doped Nanocrystals
Figure 2
Upconversion spectra for NaYF4 nanoparticles doped with Yb3+ as the sensitizer and different lanthanide activator ions: Tm3+, Ho3+, and Er3+, respectively, for curves from top to bottom. The infrared excitation light was from a 975 nm diode laser.