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Absorbance spectra were measured using a Perkin Elmer LAMBDA 650 spectrophotometer. Emission and excitation measurements were performed using an FLS1000 (Edinburgh Instruments) spectrofluorometer. Quantum yields were measured using an integrated sphere (Edinburgh Instruments) and relative method using quinine sulfate (Sigma-Aldrich) in a 0.1-N solution of H2SO4 (quantum yield of quinine sulfate, 0.546), as an average of three samples. Fluorescence lifetime measurements were determined with a time-correlated single-photon counting system (FLS1000) using picosecond-pulsed diode lasers (405 nm) and pulsed LEDs (320 nm) as excitation sources. Phosphorescence lifetime was determined with a time-resolved single-photon counting (multichannel scaling) system with a microsecond flashlamp as excitation source (FLS1000). For lifetime measurements, the samples were prepared using a solvent degassed by freeze-pump-thaw cycles. The samples for quantum yield measurements were prepared in a glove box. Samples were dissolved in EMSURE-grade toluene (Sigma-Aldrich); samples prepared in the glove box were dissolved in anhydrous toluene (Sigma-Aldrich) purged with argon for 30 min. Transient absorption measurements were performed on an LP980 (Edinburgh Instruments) spectrometer with a Spectra-Physics Nd:YAG laser coupled to a Spectra-Physics primoscan optical parametric oscillator as excitation source (320 nm). All sample concentrations, for both emission and lifetime measurements, were set to a maximum of 0.1 absorbance unit (13.5 × 10−6 M for the DBA) to avoid inner filter effects.

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