Polymer blend LEDs using polyfluorene copolymers and thermally cross-linked fluoropolymers

Vincenzo Casasanta; Timothy Londergan; Raluca Dinu

doi:10.1117/12.528054

18 June 2004 Polymer blend LEDs using polyfluorene copolymers and thermally cross-linked fluoropolymers

Vincenzo Casasanta, Timothy Londergan, Raluca Dinu

Proceedings Volume 5351, Organic Photonic Materials and Devices VI; (2004) https://doi.org/10.1117/12.528054
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

The use of conjugated light emitting polymers (LEPs) blended in non-conjugated matrices offers an enhancement in electroluminescence efficiency in polymer light emitting diodes (PLEDs) since the aggregate quenching of the excited state emission is ameliorated. In such a scheme the matrix polymer may be developed in order to enhance the thermal, mechanical, and processing properties of the LEP blend as a whole. We have produced solution processable blends of polyfluorene (PF) based copolymers with thermally crosslinkable perfluoroarylether (PFAE) polymers and tested these materials' performance as a single emissive layer in the simplest PLED structure. Specifically we present results of blends consisting of red poly[{9,9-dihexyl-2,7-bis(1-cyanovinylene)fluorenyl-ene}-alt-co-{2,5-bis(N,N'-diphenylamino)-1,4-phenylene}] as the LEP and a novel PFAE which is thermally crosslinked as the matrix. The new PFAE has been specifically developed for low optical loss, high glass transition temperature (T_g), and solution process-ability. Once spun cast and thermally crosslinked, films of these polymer blends show increased solvent resistance and enhanced T_gdue to the fluoropolymer matrix. Simple ITO/polymer/Al PLEDs of several concentration ratios are fabricated and tested in order to determine the efficacy of various matrix additions. The light-current density-voltage characteristics show either equivalent or enhanced efficiency depending on LEP/PFAE concentration. Blends of the PFAE and PF copolymer LEPs are patterned into 6μm waveguide structures utilizing the solvent resistance afforded by the crosslinked PFAE matrix.

Citation Download Citation

Vincenzo Casasanta, Timothy Londergan, and Raluca Dinu "Polymer blend LEDs using polyfluorene copolymers and thermally cross-linked fluoropolymers", Proc. SPIE 5351, Organic Photonic Materials and Devices VI, (18 June 2004); https://doi.org/10.1117/12.528054

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