Fig. 5: Singlet oxygen production activity upon exciting the UCNPs.
From: Enhancing multiphoton upconversion through interfacial energy transfer in multilayered nanoparticles
a Schematic diagram for loading hematoporphyrin monomethyl ether (HMME) and producing 1O2 on the UCNPs. b Structural formula and absorption spectrum of HMME. c Comparison of 1O2 production under 980 nm irradiation (24 W cm−2) as determined by the augmentation of singlet oxygen sensor green reagent (SOSG) fluorescence at 535 nm. For CY:20%Yb, 2%Er@SY, dSY = 10.5 ± 0.8 nm. For CY:Er@SYb@SY, dSYb = 8.3 ± 0.7 nm, dSY = 2.3 ± 0.1 nm. The error bars represent the standard deviation of three trials. Source data are provided as a Source Data file.
