Concentration effects on charge transport in dye-doped polymer light-emitting diodes

Jean-Michel Nunzi; E. Gautier-Thianche; Andre Lorin; Christine Denis; Paul Raimond; Carole Sentein

doi:10.1117/12.305434

17 April 1998 Concentration effects on charge transport in dye-doped polymer light-emitting diodes

Jean-Michel Nunzi, E. Gautier-Thianche, Andre Lorin, Christine Denis, Paul Raimond, Carole Sentein

Proceedings Volume 3281, Polymer Photonic Devices; (1998) https://doi.org/10.1117/12.305434
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

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.

Citation Download Citation

Jean-Michel Nunzi, E. Gautier-Thianche, Andre Lorin, Christine Denis, Paul Raimond, and Carole Sentein "Concentration effects on charge transport in dye-doped polymer light-emitting diodes", Proc. SPIE 3281, Polymer Photonic Devices, (17 April 1998); https://doi.org/10.1117/12.305434

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