Electric Field Oriented Nanostructured Organic Thin Films with Polarized Luminescence

I D Karbovnyk; I Olenych; I N Kukhta; A Lugovskii; G Sasnouski; T Chutora; A P Luchechko; I Khalakhan; A Kukhta

doi:10.1186/s11671-017-1936-9

Electric Field Oriented Nanostructured Organic Thin Films with Polarized Luminescence

Nanoscale Res Lett. 2017 Dec;12(1):166. doi: 10.1186/s11671-017-1936-9. Epub 2017 Mar 4.

Authors

I D Karbovnyk¹, I Olenych², I N Kukhta³, A Lugovskii⁴, G Sasnouski⁴, T Chutora⁵, A P Luchechko², I Khalakhan⁶, A Kukhta^{7

8}

Affiliations

¹ Department of Electronics and Computer Technologies, Ivan Franko National University of Lviv, Lviv, Ukraine. ivan_karbovnyck@yahoo.com.
² Department of Electronics and Computer Technologies, Ivan Franko National University of Lviv, Lviv, Ukraine.
³ Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, Minsk, Belarus.
⁴ Institute for Applied Physical Problems, Belarusian State University, Minsk, Belarus.
⁵ Regional Centre of Advanced Technologies and Materials, Faculty of Science, Joint Laboratory of Optics of Palacký University and Institute of Physics AS CR, Olomouc, Czech Republic.
⁶ Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic.
⁷ Institute for Nuclear Problems, Belarusian State University, Minsk, Belarus.
⁸ Tomsk State University, Tomsk, Russia.

Abstract

The effect of the external electric field of 10⁵ V/m on the ordering of two luminescent liquid crystalline molecules (1-pentyl-2^/,3^/-difluoro-3^///-methyl-4^////-octyl-p-quinguephenyl and 9,10-Bis (4-pentylphenylethynyl)antracene) during thermal vacuum deposition is studied. The morphology, electrical conductivity, optical absorption, luminescence spectra, and polarization are presented and analyzed. All data show the formation of ordered films. The polarization degree is 60% for 1-pentyl-2^/,3^/-difluoro-3^///-methyl-4^////-octyl-p-quinguephenyl oriented films and 28% for 9,10-Bis (4-pentylphenylethynyl)antracene. The lower value of M2 luminescence polarization can be explained by the absence of dipole moment in this molecule.

Keywords: Liquid crystalline molecules; Luminescence; Morphology; Thin films.