https://doi.org/10.15407/spqeo4.04.375
Semiconductor Physics, Quantum Electronics & Optoelectronics. 2001. V. 4, N 4. P. 375-382.
PACS: 31.50; 42.70.D; 78.55; 78.66.J
Electrooptical properties of liquid crystal n-pentil-n,-cyanobifenil with J-aggregates of astrofloxine
Yu. P. Piryatinski, M. S. Furier, V. G. Nazarenko
Institute of Physics of the National Academy of Sciences of Ukraine, 46 prosp. Nauki, 03039 Kiev, Ukarine
Abstract. It is shown that organic nanocrystallites - J-aggregates - can be formed and oriented in a liquid crystalline matrix. External electric field can reorient and destroy these nanocrystallites. Transmission and photoluminescence spectra of astrofloxine solutions in the nematic liquid crystal are investigated in d.c. and a.c. electric fields with the frequencies of 1 Hz-1 kHz and amplitudes F = 1.2ґ104 V·cm-1. Intense photoluminescence was observed at two-photon excitation. Efficiency of IR laser radiation transformation into visible photoluminescence was as high as 10%.
Keywords: liquid crystal, nanocrystallite, photoluminescence, two-photon excitation.
Paper received 16.11.00; revised manuscript received 30.01.01; accepted for publication 12.12.01.
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