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Proceedings Paper

Concentration effects on charge transport in dye-doped polymer light-emitting diodes
Author(s): Jean-Michel Nunzi; E. Gautier-Thianche; Andre Lorin; Christine Denis; Paul Raimond; Carole Sentein
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Paper Abstract

Light emitting diodes made of a single spin-coated layer of poly(9-vinylcarbazole) doped with coumarin-515 dye have been studied. The influence of dye concentration on emission and electrical characteristics is evidenced. Two different regimes are identified. At low concentrations, apparent hole injection barrier raises, holes are trapped and mobility decreases. External quantum efficiency increases with concentration. At concentrations larger than 10%wt, coumarin aggregates, photoluminescence yield drops and electroluminescence yield increases up to 0.1%-photons per electron. We show that using coumarin dye in a single-layer diode improves electron-hole injection and recombination balance more than using an additional hole-blocking layer.

Paper Details

Date Published: 17 April 1998
PDF: 8 pages
Proc. SPIE 3281, Polymer Photonic Devices, (17 April 1998); doi: 10.1117/12.305434
Show Author Affiliations
Jean-Michel Nunzi, CEA Saclay (France)
E. Gautier-Thianche, CEA Saclay (France)
Andre Lorin, CEA Saclay (France)
Christine Denis, CEA Saclay (France)
Paul Raimond, CEA Saclay (France)
Carole Sentein, CEA Saclay (France)

Published in SPIE Proceedings Vol. 3281:
Polymer Photonic Devices
Bernard Kippelen; Donal D. C. Bradley, Editor(s)

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