Ukrainian Journal of Physical Optics

Number 3, Volume 7, 2006

Photoluminescence of Nematic Liquid Crystal Doped with Anthraquinone Dye
¹Gayvoronsky V., ¹Yakunin S., ¹Pergamenshchik V., ¹Nazarenko V., ²Palewska K., ²Sworakowski J., ³Podhorodecki A., ³Misiewicz J.

¹Institute of Physics of NASU, 46 Nauki Ave., 03028 Kiev, Ukraine
²Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology, 50-370 Wroclaw, Poland
³Institute of Physics, Wroclaw University of Technology, 50-370 Wroclaw, Poland

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Photoluminescence and absorption spectra of nematic liquid crystal 5CB doped with an anthraquinone dye (AQ) hare studied. An effective energy transfer from the fast relaxing S1 level of 5CB with intensive PL band at 410 nm to slowly relaxing AQ level with PL band at 724 nm is discovered. On the basis of these results we reconstruct the energy level diagram that explains the stages of energy transfer process in the host-guest system.

Key words: liquid crystal, organic dye, photoluminescence, energy transfer

PACS: 42.70.Df, 78.55.Bq, 78.47.+p.

doi 10.3116/16091833/7/3/116/2006

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