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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:52 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Polymer Physics
Title:
Switch-off response time improvement of liquid crystal pixels containing polyaniline structured walls
Authors:
Bogdan BUTOI (1,2), Paul DINCA (1,2), Vlad LUPU (1), Cornel STAICU (1,2), Dumitru STAICU (1), Valentin BARNA (1), Emil-Stefan BARNA (1)
*
Affiliation:
1) University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Magurele, Bucharest, Romania
2) Institutul National pentru Fizica Laserilor, Plasmei si Radiatiei, Str. Atomistilor nr 409, Magurele, Romania
E-mail
bogdan.butoi@g.unibuc.ro
Keywords:
liquid crystal cells, Organic Light Emitting Diode, nematic order, plasma polymerized polyaniline
Abstract:
Liquid crystal (LC) cells are part of multi-billion dollar industry, being employed in many types of displays available on the market (excepting the very expensive and newly emerging Organic Light Emitting Diode). Every pixel of a monitor is made up of a nematic LC trapped between two conductive walls. In a non-polarized state the liquid crystal molecules organize themselves depending on the type and treatment of the cell`s wall. Applying a voltage on the electrode walls the nematic will tilt in order to follow the electrical field lines (if the LC material has positive dielectric anisotropy). The current work is focused on obtaining liquid crystal cells with structured direct current plasma polymerized polyaniline, in order to properly align the nematic LC. The polyaniline thin films were obtained in a custom made plasma polymerization reactor which allowed the variation of multiple deposition parameters such as discharge current, electrode distance, substrate position and inclination during the deposition. The obtained depositions, presenting different morphological, structural and chemical proprieties, were used in fabricating LC cells and were tested in an electro-optical system. Some of the samples showed great improvements in the electro-optical response time, sufficient enough so they can be used in immediate commercial applications.
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