Structure and spectral-luminescent properties of polymethine dyes

Peculiarities of radiative recombination in amorphous molecular semiconductors doped with polymethine dye

“…The valence orbital of the PD H-aggregate has a smaller energy dierence with the valence orbital of the carbazole nucleus with than the valence orbital of the monomeric PD molecule. 5 Therefore it would be natural to assume that electron transitions upon exciton collapse to free molecular orbitals of PD H-aggregates are more eective than to monomeric PD molecules.…”

“…4 On the other hand, PD molecules were chosen as the recombination and photogeneration centres because their absorption and luminescence bands exist in the visible and near-IR parts of the spectrum, depending on the molecular structure, and also owing to their high quantum yield of luminescence. Since the high-valence states of PD are energetically close to the high-valence orbitals of carbazole, 5 hole transitions from PEPC's carbazole nucleus into the valence molecular orbitals of PD molecules and in the opposite direction can occur.…”

The influence of temperature on optical properties of merocyanine dye thin films

“…3. Absorption spectra of polymethine dye thin films under various conditions of their deposition on: PTFE substrate at room temperature (1), glass substrate at room temperature (1), PTFE substrate at the temperature 70 ºC (3), glass substrate at the room temperature 70 ºC (4). The distance between these absorption bands is defined by the distance L between molecule centers in the aggregate.…”

“…Recently, more attention has been paid to organic compounds, among them are polymethine (cyanine) dyes due to their photophysical and photochemical properties in the visible and near infrared range of the spectrum [1]. They are used as spectral sensitizers in manufacturing technology of photographic materials [2] and laser components [3].…”

Fluorescence research in Ukraine

“…He proved the phenomenon of interaction between chromophores in bis-cyanines, resulting in splitting of their absorption maxima [4] (later called the 'Kiprianov's splitting'). Kiprianov founded the Scientific School of Cyanine Dyes and now his school successfully works on the synthesis, theory and application of cyanine dyes [5][6][7][8].…”