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Proceedings Paper

Charge injection and transport in a green-emitting polyfluorene
Author(s): Dmitry Poplavskyy; Wencheng Su; Florian Pschenitzka; Franky So
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Paper Abstract

Experimental studies of charge injection and transport of holes and electrons in LUMATIONTM Green 1300 Series Light-Emitting Polymer (LEP) by dark injection space-charge-limited technique are performed. It is found that hole mobility is lower than electron mobility and the former exhibits steeper electric field dependence thus reducing the disbalance between charge mobilities at higher device operating voltages. Electron current is affected by trapping, mainly due to deep traps prevailing at low electric fields and with an estimated concentration of 1016 cm-3. Hole current is affected both by trapping and injection limitation, with the trapping being approximately independent of electric field and injection efficiency increasing with increasing electric field. Electron trapping is found to be significantly reduced in dual carrier devices, which is believed to be the effect of faster exciton formation and recombination rates, compared to electron trapping processes.

Paper Details

Date Published: 10 November 2004
PDF: 10 pages
Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004);
Show Author Affiliations
Dmitry Poplavskyy, OSRAM Opto Semiconductors Inc. (United States)
Wencheng Su, OSRAM Opto Semiconductors Inc. (United States)
Florian Pschenitzka, OSRAM Opto Semiconductors Inc. (United States)
Franky So, OSRAM Opto Semiconductors Inc. (United States)

Published in SPIE Proceedings Vol. 5519:
Organic Light-Emitting Materials and Devices VIII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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