Influence of dipole moments on light-emitting features of cardo-type 1H-pyrazolo[3,4-b]quinolines

From pirazoloquinolines to annulated azulene dyes: UV–VIS spectroscopy and quantum chemical study

“…Such asymmetry is obviously related with a specific geometry of the phenylazulene moiety having substantially bent shape in the ground state (see inserts in Figs. [1][2][3][4]. In all the cases the energy barriers between the equilibrium angular orientations of the phenyl ring are of the order of k B T (k B is the Boltzmann constant) thus according to the Boltzmann statistic one may expect rather large angular amplitudes (even up to 401) in their rotational dynamics at room temperature.…”

“…Organic dyes and fluorescent materials attract considerable attention in a context of their potential applications in dye lasers [1,2] and electroluminescent devices mainly as fluorescent dopants [3][4][5][6] or phosphor reemitters [7]. Their electronic properties in relation to a molecular structure, chemical substitution or solvent environment effects appear in a scope of numerous experimental and theoretical studies where the optical spectroscopy methods are usually combined with a quantum chemical analysis or modeling [8,9].…”

Blue organic light-emitting diodes with low driving voltage and enhanced power efficiency based on MoO3 as hole injection layer and optimized charge balance

“…Additionally, the relatively wide half widths (in case of MoO 3 based devices) may indicate on the substantial role of the electron-vibration broadening of line and several contributions of the inter-conformation states. Because different confirmation states substantially change the values of the potential barriers determining the processes of the charge carriers transport including the exciton states [19].…”

Synthesis, optical properties and crystal structures of carbazole end-capped phenylene ethynylene blue light-emitting materials

“…Over the past few years, p-conjugated organic materials have attracted much attention due to the increasing development of potentially active components for a wide range of electronic and optoelectronic devices [1][2][3][4][5][6][7]. Among these, carbazoles have been the subject of significant study due to their intense luminescence and structure stability.…”