Figure 5
Luminescence spectra of the HM_YxM samples under excitation at (a) 395 and (b) 685 nm. Simplified energy level diagram of the Yb3+ ions with (c) SNPs and (d) GNPs with the main transitions that describe the plasmon-photon conversion, as well as the optical band gap for the (c) HM_YxS and (d) HM_YxG samples.
