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Proceedings Paper

Electroluminescence from multilayer conjugated polymer devices--spatial control of exciton formation and emission
Author(s): Neil C. Greenham; Adam R. Brown; Jeremy H. Burroughes; Donal D. C. Bradley; Richard H. Friend; Paul L. Burn; Arno Kraft; Andrew B. Holmes
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Paper Abstract

We have constructed electroluminescent diodes using several layers of conjugated polymers with differing energy gaps; these provide a range of different color light-emitting layers and can be used to control charge injection and transport. Poly(1,4-phenylenevinylene), PPV, and derivatives have been used, with indium tin oxide as hole-injecting electrode and calcium as electron-injecting electrode. For this selection of materials, we show that the sequence of the polymer layers allows control of the color of device emission. Emission from more than one layer can be produced simultaneously. The position and breadth of the light-emitting region of the device provides information about the mechanisms of charge transport and of exciton motion. Various models for multilayer emission are discussed in the paper.

Paper Details

Date Published: 27 August 1993
PDF: 9 pages
Proc. SPIE 1910, Electroluminescent Materials, Devices, and Large-Screen Displays, (27 August 1993); doi: 10.1117/12.151138
Show Author Affiliations
Neil C. Greenham, Univ. of Cambridge (United Kingdom)
Adam R. Brown, Univ. of Cambridge (United Kingdom)
Jeremy H. Burroughes, Univ. of Cambridge (United Kingdom)
Donal D. C. Bradley, Univ. of Cambridge (United Kingdom)
Richard H. Friend, Univ. of Cambridge (United Kingdom)
Paul L. Burn, Univ. of Cambridge (United Kingdom)
Arno Kraft, Univ. of Cambridge (United Kingdom)
Andrew B. Holmes, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 1910:
Electroluminescent Materials, Devices, and Large-Screen Displays
Esther M. Conwell; Milan Stolka; M. Robert Miller, Editor(s)

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