TEMPERATURE DEPENDENCE OF THE LUMINESCENCE SPECTRA OF A 5СВ LIQUID CRYSTAL AND ITS PHASE TRANSITIONS
Abstract
The spectral-luminescence properties of the 4-cyano-4'-pentylbiphenyl CH3(CH2)4(C6H4)2CN (5CB) liquid crystal has been studied in the temperature range 4.2-297 K. It is shown that at increasing temperature the fluorescence spectra are shifted to the red side. The spectral long-wavelength shifts are also analyzed. A comparison of the temperature behaviour position of the emission of the band maxima lmax and their half-widths Δl/2 in the fluorescence spectra and the results of the DSC-investigation show that phase transitions occur in 5CB liquid crystals at T ~ 230 and 260 K.
About the Authors
G. V. Klishevich
Institute of Physics of the National Academy of Sciences of Ukraine
Russian Federation
Russian Federation
N. D. Kurmei
Institute of Physics of the National Academy of Sciences of Ukraine
Russian Federation
Russian Federation
V. I. Melnik
Institute of Physics of the National Academy of Sciences of Ukraine
Russian Federation
Russian Federation
A. G. Tereshchenko
Institute of Physics of the National Academy of Sciences of Ukraine
Russian Federation
Russian Federation
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Review
For citations:
Klishevich G.V., Kurmei N.D., Melnik V.I., Tereshchenko A.G. TEMPERATURE DEPENDENCE OF THE LUMINESCENCE SPECTRA OF A 5СВ LIQUID CRYSTAL AND ITS PHASE TRANSITIONS. Zhurnal Prikladnoii Spektroskopii. 2018;85(5):803-807. (In Russ.)
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