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(A) Photoluminescence spectrum of the NaYF4:Yb3+,Tm3+ nanoparticles, excited by a 980 nm diode laser, and the excitation and emission spectra of SYBR Green I are included for comparison. (B) Photoluminescence spectra of the photon UCNPs before (dark) and after (red) the addition of 2.6 nM of Hg ions, in the presence of SYBR Green I (~2 uM) and PDCA (∼6.8 mM). Reproduced with permission from reference 90.
