Fluorescence and Electronic Structure of the Laser Dye DCM in Solutions and in Polymethylmethacrylate

Correlating the motion of electrons and nuclei with two-dimensional electronic–vibrational spectroscopy

“…In dimethyl sulfoxide (DMSO), the static Stokes shift (λ) is 5,200 cm −1 (see Fig. S2 for the absorption and fluorescence spectra in DMSO-d 6 ) but is only 3,200 cm −1 in n-hexane (27). This difference in Stokes shift is also accompanied by a commensurate difference in the fluorescence quantum yield, which varies by two orders of magnitude between nonpolar and polar solvents (27,28).…”

“…S2 for the absorption and fluorescence spectra in DMSO-d 6 ) but is only 3,200 cm −1 in n-hexane (27). This difference in Stokes shift is also accompanied by a commensurate difference in the fluorescence quantum yield, which varies by two orders of magnitude between nonpolar and polar solvents (27,28). There are currently two models for excited-state relaxation of DCM: (i) The first electronically excited state, S 1 , is a valence or locally excited (LE) state that undergoes fast nonradiative decay into a lower-lying CT state (CT state between the dimethylaniline and pyran rings) and emission from CT state dominates the fluorescence quantum yield (29)(30)(31)(32)(33)(34).…”

Comparison of the performance of photonic band-edge liquid crystal lasers using different dyes as the gain medium

“…The absence of structure in the fluorescence bands is indicative of dyes with intramolecular charge transfer in a polar solvent. 19 …”

Synthesis and Physical Properties of Red Luminescent Glass Forming Pyranylidene and Isophorene Fragment Containing Derivatives

“…PLQY thus measured for all compounds are summarised in Table 3. Compounds with more polar groups attached exhibit PLQY up to 0.54 in dilute solutions, which is slightly higher than for DCM dye in similar surroundings [42,43]. PLQY depends slightly on the acceptor group as can be seen from Table 3.…”