University of California

Daniel Moses

Alan J Heeger

Guillermo C Bazan

Jeffrey Peet

Xiong Gong

Guangming Wang

James S Swensen

Shu Wang

Thuc-Quyen Nguyen

Cesare Soci

Wanli Ma

Alexander Mikhailovsky

Jacek Ostrowski

Martin Vehse

Marc Pauchard-Strebel

Improved processing methods for enhanced properties of conjugated polymer films are disclosed, as well as the enhanced conjugated polymer films produced thereby. Addition of low molecular weight alkyl-containing molecules to solutions used to form conjugated polymer films leads to improved photoconductivity and improvements in other electronic properties. The enhanced conjugated polymer films can be used in a variety of electronic devices, such as solar cells and photodiodes.

Enhancing performing characteristics of organic semiconducting films by improved solution processing

Enhancing performance characteristics of organic semiconducting films by improved solution processing

Multilayer polymer light-emitting diodes (PLEDs) are demonstrated using semiconducting polymers blended with organometallic emitters as the emissive layer and one or both of an electron transport layer and a hole transparent layer on the appropriate electron injection and hole injection sides of the emissive layer. The transport layers reduce energy potential gaps between the hole injection electrode and the emissive polymer and between the electron injection electrode and the emissive polymer. A solvent-processing based procedure for preparing these devices is also disclosed It uses nonpolar solvent-based solutions of emissive polymers to form the emissive layer and polar solvent-based solutions to form the transport layers to minimize etching and other undesirable interactions as the multiple layers are being laid down. Illumination quality white light can be obtained with stable Commission Internationale de l'Eclairage coordinates, stable color temperatures, and stable color rendering indices, all close to those of 'pure' white light. These multilayer white light-emitting PLEDs are useful as backlights for liquid crystal displays and for solid state lighting applications.

Multilayer polymer light-emitting diodes for solid state lighting applications

White light-emitting electrophosphorescent polymeric light-emitting diodes (PLEDs) are demonstrated using semiconducting polymers blended with organometallic emitters as emissive materials in a common region. These materials may be cast from solution. The CIE coordinates, the color temperatures and the color rendering indices of the white emission are insensitive to the brightness, applied voltage and applied current density.

White electrophosphorescence from semiconducting polymer blends

Organic FETs are produced having high mobilities in the accumulation mode and in the depletion mode. Significantly higher mobility is obtained from FETs in which RR-P3HT film is applied by dip-coating to a thickness of only about 20 &#x212b; to 1 &#x3bc;m. It was found that the structural order of the semiconducting polymer at the interface between the semiconducting polymer and the SiOgate-insulator is important for achieving high carrier mobility. Heat-treatment under an inert atmosphere also was found to increase the on/off ratio of the FET.

Increased mobility from organic semiconducting polymers field-effect transistors

A solid state lasing structure comprising a field effect transistor in which source and drain electrodes are disposed on a semiconducting light emitting organic polymer forming an active layer on a gate whereby current between the source and drain electrodes defines and flows along a channel in the active layer to define a recombination and emission zone.

Injection lasers fabricated from semiconducting polymers

A novel dye laser comprises a laser dye solution comprising a conductive polymer having the chemical formula ##STR1## wherein R comprises (C.sub.1 -C.sub.10)alkyl, R' is the same or different from R and comprises alkyl, substituted alkyl, benzyl, or substituted benzyl, such as --(CH.sub.2).sub.n CH.sub.3 or CH.sub.2 C.sub.6 H.sub.4 (CH.sub.2).sub.n Y, wherein Y is O-alkyl, alkyl, alkenyl or alkynyl and n is greater than 1 and up to 200, and for structure IV R' is the same or different from R and comprises (C.sub.1 -C.sub.10)alkyl, and x is greater than about 20, and a non-aqueous solvent; the solvent being substantially unable to chemically react with the polymer and to absorb and emit light at a wavelength similar to the conductive polymer, and a pumping energy source operably coupled therewith and capable of producing stimulated emmission of the dye solution. A laser device, comprising a solid body of the conductive polymer described above, and a host polymer, the host polymer being unable to chemically react with the polymer and unable to absorb and emit light at a wavelength similar to the conductive polymer, means for pumping the body to generate light therein, and means for creating distributed feedback of the light to achieve a substantially coherent beam of light which is emitted from the body.

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Santa Barbara, CA, United States of America

Daniel Moses