Luminescence and circularly polarized luminescence of excited-state chiral structures in one-dimensional PIC-J dye aggregates
Luminescence (TL) and circularly polarized luminescence (CPL) spectra of polymeric pseudoisocyanine dye J-aggregates (PIC-J) are investigated to clarify the molecular arrangements generating a one-dimensional excitonic J-band in the excited state. In the presence of l- and d-phenylalaninol (PAOL), the PIC-J aggregates are found to reveal CPL spectra at room temperature with luminescence dissymmetry factors glum for J-bands of ?0.05, which are comparable in magnitude with the corresponding Kuhn g-factors in the ground state derived by comparison of J-bands in circular dichroism and absorption spectra. Chiroptical and helical structures along with one-dimensional chains are considered to generate Pfeiffer effects through intermolecular interactions between PIC-J dye and chiral PAOL. CPL and TL spectra of PIC-J dyes in the presence of DNA and phenylethylamine are further considered.
luminescence pic-j dye cpl spectroscopy one-dimensional system