Intramolecular charge-transfer fluorescence as a mobility probe in poly(methylmethacrylate)

OLED and PLED Devices Employing Electrogenerated, Intramolecular Charge‐Transfer Fluorescence

“…[8,15,16] Nevertheless, by looking at the rise of the CT emission (at the maximum), it is obvious that, as expected, the energy transfer becomes faster as the doping concentration is increased (Figure 6a). In films with system 3, the emission maxima of the excimer of PVK and that of the probe are so close in position during the first nanosecond of the luminescence decay that it is virtually impossible to distinguish between them.…”

Picosecond time-dependent Stokes shift studies of fluoroprobe in liquid solution

“…the coumarine dyes, notwithstanding the fact that the latter probes were studied in more polar solvents and at much higher time resolution [11,47,48]. This clearly illustrates that fluoroprobe is an exceptionally good solvation probe [12][13][14][15][16][17].…”

“…1) [12][13][14] has been reported and it has also already been used as a probe molecule to examine the solvation process in a number of polymer matrices and organic glasses [15][16][17]. The solvation times for these highly viscous and slowly relaxing 'solvents' are on the order of tens of nanoseconds, and these systems could be conveniently studied at relatively low time resolution (approximately 10 ns) in an experiment in which the sample was excited by a nanosecond laser pulse and the emission was detected by a synchronized electronically gated optical multichannel analyser [15][16][17]. In the present work we use the same probe molecule, but now applying fluorescence spectroscopy with a time resolution of approximately 10 ps, in an attempt to elucidate dynamics of two 0301-0104/95/$09.50 © 1995 Elsevier Science B.V. All rights reserved SSDI 0301-0104(95)00219-7 ordinary solvents, viz.…”

New fluorescent hyperbranched polymeric sensors as probes for monitoring photopolymerization reactions

“…It is possible because their fluorescence is sensitive to the polarity, mobility and/or (micro)viscosity of the molecular environment in which the probe molecules are located. This sensitivity can be achieved via a number of physical interactions: intramolecular reorientation (such as molecular rotors [1] and intramolecular excimer formation [2]), diffusion-controlled interactions [3], and solvent-dipole stabilization of the excited state of the probes (chargetransfer probes [4,5]). The physical origin of the sensitivity to the molecular environment, for a given probe molecule, is not necessarily determined by only one of the aforementioned interactions [6].…”