Polarized polymer light-emitting diodes

Polythiophenes for Structured and Polarized Polymer Light-Emitting Diodes... 

E Peeters, MPT Christiaans, RAJ Janssen, HFM Schoo, HPJM Dekkers, and EW Meijer, Circulary polarized electroluminescence from a polymer light-emitting diode, J. Am. Chem. Soc., 119 9909 9910, 1997. 

M. Jandke, K. Kreger, P. Strohriegl, A. Relini, R. Rolandi, S. Blumstengel, Polarized Electroluminescence in Double-Layer Light-Emitting Diodes with Perpendicularly Oriented Polymers, Adv. Mater. 13 (2001) 1072. 

Michelotti, R, S. Bussi, L. Dominici, M. Bertolotti, and Z. Bao. 2002. Space charge effects in polymer-based light-emitting diodes studied by means of a polarization sensitive electroreflectance technique. / Appl Phys 91 5521-5532. 

Relini, A., Rolandi, R., and Blumstengel, S. (2001) Polarized electroluminescence in double-layer light-emitting diodes with perpendicularly oriented polymers. Adv. Mater., 13,1072. 

In fact, if a weak electrolyte gel such as a poly(acrylic acid) is deformed, macroscopic dielectric polarization is observed. This results from the stretching of polymer chains by the deformation and resultant automatic acceleration of ionization. Utilizing this phenomenon, it is possible to develop a piezoelement that converts deformational stress into electrical energy. A pressure sensor whose diode emits light when the gel is pressed and an artificial contact sensing device also have been proposed [20]. 

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