Molecular alignment effects on spectroscopic properties 2,1,3-benzothiadiazole guested in liquid–crystalline compounds

Emission ellipsometry used to probe aggregation of the luminescent 2,1,3-benzothiadiazole dyes and ordering in an E7 liquid crystal matrix

“…Consistent with a previous paper, 23 b depends on the dye concentration. Molecular ordering is higher for the larger dye 5A because it is less prone to losing the alignment than the smaller dye 1A.…”

Optical properties of a mesogen by image analysis

“…where I 0 , I 90 , I 45 , I -45, I r and I l are, respectively, the intensities of the textures obtained from the vertical, horizontal, ±45 • , and right and left circular polarisation states [23,24]. The degree of polarisation of S-MB-nB-BC (n = 16 and 18) was calculated using Equations (2) and (3).…”

Achromatic Ellipsometry: Theory and Applications

“…In Figure 4b-d, polarized absorption spectrum, parallel, and perpendicular polarization are presented for S00, S45, and S90 samples, respectively. With these measurements, it was possible to observe that the 5A dye molecules are oriented in the same direction of the liquid crystal [21,22]. An important fact is that S45 and S90 samples did not present the same line shape for the polarized absorption optical spectrum when the light interacted firstly in the different faces of samples.…”