Figure 1
From: Switchable sensitizers stepwise lighting up lanthanide emissions
Excitation spectra of 1 (λem = 613 nm) in different concentrations and absorption spectra of TPE-TPY, Eu(hfac)3·2H2O and [TPY-Eu(hfac)3] in CH2Cl2 with the concentrations of 10−5 M at 298 K.
