A study of the orientations of fluorescent molecules incorporated in uniaxially oriented poly(ethylene terephthalate) tapes

Polarized fluorescence and orientational order parameters of a liquid-crystalline conjugated polymer

“…11 Hence, polarized fluorescence spectroscopy has been extensively used to study orientational characteristics of anisotropic samples such as liquid crystalline materials [12][13][14][15][16][17][18][19] and stretched polymers. [20][21][22][23][24][25][26] We note also that polarized EL is governed by the same matrices and hence the development of polarized backlights and other devices can benefit directly from the information obtained via polarized fluorescence studies.…”

Orientation of fluorescent probes and polymer segments in uniaxially drawn polycarbonate and Polyvinylchloride films as revealed by dichroism, fluorescence polarization and birefringence

“…If the relative orientation of polymer segments to the fluorescent probes is determined, one can infer in a second step the segmental orientation. Therefore it is important to know the location and orientation of the fluorescent molecules with regard to the polymer segments [4][5][6]. More detailed questions are: how do the probes orientate as a function of drawing parameters, as for example of draw temperature and draw ratio, and how do these parameters influence the relative orientation of segments and probes ?…”

Determination of orientational order parameters of uniaxial films with a commercial 90°-angle fluorescence spectrometer

“…6,7 In anisotropic specimens, polarized fluorescence experiments carry information on the orientation distribution function ͑odf͒ and the transition moment direction of the oriented fluorescence molecules. 1 Chromophores, incorporated in a matrix at a low concentration can be used to get information about the odf of the matrix [8][9][10][11] or on the chromophores themselves ͑e.g., transition moment directions in the molecular framework͒. 1,12 For quantitative analysis, the instrumental polarization sensitivity and the geometry of the experimental arrangement have to be taken into account.…”

“…1,12 For quantitative analysis, the instrumental polarization sensitivity and the geometry of the experimental arrangement have to be taken into account. Experiments on anisotropic samples are usually performed in special equipment with an angle of 180°between excitation and emission beam 8,10,11 or with a variable angle. 12 In commercial fluorescence spectrometers the angle between excitation and emission beam is usually 90°.…”