Quantaurus qy c11347 11

Diffuse reflectance UV-vis spectra of pressed powder samples diluted with KBr were recorded on a Shimadzu (UV-3600 spectrophotometer with a Harrick Praying Mantis accessory) and recalculated following the Kubelka–Munk function. Excitation and emission spectra in the solid state, as well as lifetime measurements, were recorded with an Edinburgh FLS 1000 fluorescence spectrometer. Quantum yields were measured in the solid state using a Hamamatsu Quantaurus-QY C11347-11 integrating sphere with different excitation wavelengths.

The quantum yields of the dye solutions were measured using an absolute photoluminescence quantum yields measurement system, Quantaurus-QY C11347-11 (Hamamatsu Photonics K.K.). The dye solution (2 mL) was set in a specialized quartz cuvette and excited at a wavelength shorter than the short-edge of the fluorescence spectrum.

¹H and ¹³C-{¹H} NMR, including 2D experiments, were recorded at room temperature (rt) on a BRUKER AVANCE 300 spectrometer (Bruker, Billerica, MA, USA) (¹H-300 MHz, ¹³C-75 MHz) with chemical shifts (δ, ppm) reported relative to the solvent peaks of the deuterated solvent [25 (link)]. Mass spectra were recorded on a BRUKER ESQUIRE 3000 PLUS (Bruker, Boston, MA, USA), with the electrospray (ESI) technique. Steady-state photoluminescence analysis was performed in a Jobin-Yvon-Horiba fluorolog FL-3-11 spectrometer (Jobin Ybon Inc., Edison, NJ, USA). UV−Vis data were collected on an Evolution 600 spectrophotometer (Thermo Electron Scientifc Instrument LLC., Madison, WI, USA) using 1 cm quartz cells. Quantum yields were measured in a Hamamatsu Photonics Quantaurus-QY C11347-11 (Hamamatsu Photonics K.K., Hamamatsu City, Japan) via an absolute method, using an excitation scanning mode. The specific procedure entailed the measurement of each sample in aerated DMSO solution at room temperature (rt) after recording the reference sample (neat DSMO) in the same conditions. This procedure was repeated three times to confirm reproducibility and the quantum yield value given was this obtained at 440 nm excitation.

The UV-Vis absorption spectra and PL spectra were performed on a Varian Cray 500 spectrophotometer and a Horiba Fluoromax-4 at 25 °C, respectively. Phosphorescence spectra and phosphorescence lifetimes were obtained on a Varian Cary Eclipse spectrophotometer. Quantum yields were measured by using an integrating sphere on a HAMAMATSU Quantaurus-QY C11347-11. Powder X-ray diffraction (XRD) was performed on a D/max2550VB/PC. Circular dichroism (CD) spectra were acquired using the JASCO J815 spectrophotometer. CPL spectra were acquired using the JASCO CPL-200 spectrofluoropolarimeter. GPC was performed on a Series 200. Except special instructions, the UV irradiation source used was from tunable 365 nm LED lamp with 16.7 mW/cm².