Avaspec 3648 spectrophotometer

To characterize the photoexcitation and photodynamic properties of these materials, spectroscopic examinations were conducted by the AvaSpec-3648 spectrophotometer with 2 nm spectral resolution (Avantes Inc., Apeldoorn, The Netherlands) in the transmission mode with deuterium-halogen lamp (AvaLight-DH-S-BAL Avantes Inc., Apeldoorn, The Netherlands). The ATR-FTIR spectra of photoactive materials deposited on the slide glass were obtained using a Nicolet iN10 infrared microscope (Thermo Fisher Scientific, Waltham, MA, USA) equipped with liquid nitrogen-cooled mercury cadmium telluride (MCT-A) detector and Slide-On MicroTip Ge ATR crystal. The microscope was continuously purged with dry air. All spectra were collected in the range of 3750–675 cm⁻¹ with a spectral resolution of 4 cm⁻¹, averaging 128 scans. Directly before sampling, the background spectrum of germanium/air was recorded as a reference (256 scans, 4 cm⁻¹). All spectra were registered at room temperature. Each sample was measured three times and then averaged to cover variation in material thickness. All spectra were analyzed using OriginPro (ver. 2019, OriginLab Corporation, Northampton, MA, USA).

To examine the absorption/emission spectra of the examined PS and to determine the photoexcitation conditions, spectrophotometric measurements were performed with an AVA-Spec 3648 spectrophotometer (Avantes Inc., Apeldoorn, The Netherlands) with 2 nm spectral resolution. The Avalight-DH-S-BAL deuterium halogen lamp (Avantes Inc., Apeldoorn, The Netherlands) working in the wavelength range 200–1100 nm was used as the light source. As an excitation source in the measurement of PS luminescence measurement, the continuous wave semiconductor laser λ = 405 nm (TOPGaN, Warsaw, Poland) was applied.