Low-temperature photoluminescence of 5CB liquid crystal

Tunable photoluminescence of porous silicon by liquid crystal infiltration

“…In our experiment we measured the PL of the liquid crystal itself on an optical quartz plate, and we found that the PL of curve A is identical to the PL spectrum of the liquid crystal on the optical quartz plate. On comparing with the PL spectrum of the liquid crystal, we can conclude that the PL of sample A comes from the liquid crystal itself [18][19][20][21][22][23] and no trace of the PL of porous silicon is found in curve A. Finally we analyze the PL for samples B, C and D. Curves B, C and D in Fig.…”

“…[18][19][20][21][22]; in the meanwhile the mechanisms of the PL of porous silicon were documented in the literature [1][2][3][5][6][7][8]17,18,23,25]. Now we come to address the question of why the PL of liquid crystal infiltrated porous silicon can be switched between the mostly blue component and the minor red component.…”

“…For example, Piryatinski et al [16,17] recently reported the enhancement of fluorescence of porous silicon upon the saturation of a liquid crystal. In literature, a variety of liquid crystal molecules can give off intense PL in the blue spectral region [18][19][20][21][22][23]. If those light-emitting liquid crystal molecules can be incorporated into the microchannels of porous silicon films, the PL of liquid crystal infiltrated porous silicon is expected to be tunable in the entire visible spectral region because porous silicon gives off strong red PL at one end while liquid crystal gives of intense blue PL at the other end.…”

Chitosan as matrix for bio-polymer dispersed liquid crystal systems

“…Due to its use in composite obtaining, many studies have been dedicated to the investigation of its photophysical properties, concluding that the 5CB spectral changes are connected with the formation and destruction of different monomer and dimer structures of the 5CB molecules and also with their conformational changes (Bezrodna, Melnyk, Vorobjev, & Puchkovska, 2010;Piryatinski & Yaroshchuk, 2000). To see how the confinement of the 5CB in the chitosan matrix affects its photophysical characteristics, the fluorescence spectra of the PDLC films were recorded, by exciting them with ex = 315 nm (Bezrodna et al, 2010).…”

Size and chain length effects on structural behaviors of biphenylcyclohexane-based liquid crystal nanoclusters by a coarse-grained model

“…Up to date, to the authors' knowledge, not many related works were found in the available literature. Recently, Bezrodna et al [26] studied photoluminescence spectra of the 4-n-pentyl-4′-cyanobiphenyl (5CB) liquid crystal at low temperatures ranging from 4. 5CB, having different 5CB monomer and dimer conformers, were observed below 160 K. The simultaneous co-existence of the different conformers of the 5CB molecules at the low temperatures is responsible for the formation of the different types of monomer and dimer structures.…”