Fluorocube time correlated single photon counting system

Each compound was dissolved in MeCN and degassed using the freeze-pump-thaw method prior to measurement. Emission spectra were recorded at 25 °C using either a JASCO FP-8600 spectrofluorometer or a Hamamatsu C9920-02 system. The absolute emission quantum yields were evaluated using the Hamamatsu C9920-02 system equipped with an integrating sphere and a multichannel photodetector (PMA-12). Emission lifetimes were obtained using a HORIBA TemPro fluorescence lifetime system with an emission monochromator. The excitation light source was a NanoLED-560 pulse lamp and the instrumental response time was less than 0.1 ns. All emission decays were fitted by single or double exponential functions within appropriate χ 2 (0.96-1.24). Transient emission spectra were recorded by the point-to-point measurement method using a Horiba FluoroCube time-correlated single-photon counting system. Sensitivity of the system at each detection wavelength was calibrated using correction coefficients determined from the difference between [Ru(4,4′-dimethyl-2-2′bipyridine) 3 ] 2+ spectra recorded with the JASCO FP-8600 spectrofluorometer and the HORIBA TemPro fluorescence lifetime system.