Fig. 6 | NPG Asia Materials

Fig. 6

From: Near-infrared light-mediated rare-earth nanocrystals: recent advances in improving photon conversion and alleviating the thermal effect

Fig. 6

Energy migration and upconversion emission spectra of Er3+ -based upconversion nanocrystal: a Typical strategy of preventing energy migration to surface defects and eliminating luminescence quenching in nanocrystals through inert-shell coating. b Proposed mechanism involving the use of a Tm3+-mediated trapping center for energy condensation in a core–shell nanocrystal to prevent energy migration over a long distance. c Upconversion emission spectra of NaYF4:Er/Tm@NaYF4 UCNPs doped with different Er3+ and Tm3+ concentrations. Adapted with permission from Chen et al.74 (copyright 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Back to article page