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Proceedings Paper

High-efficiency polymer LEDs : triplets and novel devices
Author(s): Eric A. Meulenkamp; Rajan van Aar; Jolanda J. A. M. Bastiaansen; A. J.M. van den Biggelaar; Herbert Borner; Klemens Brunner; Michael Buchel; Addy van Dijken; Nicole M. M. Kiggen; Mary Kilitziraki; Margreet M. de Kok; Bea M.W. Langeveld; Marcel P. H. Ligter; Simone I. E. Vulto; Peter van de Weijer; Suzanne H. P. M. de Winter
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Paper Abstract

We present results and a discussion of highly efficient polymer Light-Emitting Diodes (polymer LEDs, PLEDs). The external quantum efficiency in current standard devices reaches up to 2-4% only. We have explored two routes to enhance this value. In the first route, PEDOT/PSS is replaced with a novel anode or hole injection layer. The efficiency with some Light Emitting Polymers (LEP) is improved significantly, resulting in an efficacy of 35 cd/A for a yellow emitting poly-(para-phenylene-vinylene) and 20 cd/A for a blue emitting poly-(spirobifluorene). We attribute the major improvement compared to standard devices, where about 10 and 5 cd/A are obtained, respectively, to a combination of improved exciton formation efficiency and light out-coupling efficiency, and to less quenching of the radiative decay under actual device operating conditions. In the second route, we developed a new host polymer with high triplet energy such that transition metal-based green-emitting phosphorescent dyes can be used without significant back transfer of triplet excitons to the polymer host. First results using this system showed about 25 cd/A using a soluble green Ir-based emitter. Importantly, all data are obtained in a standard two-layer device of a hole transport/injection layer and the LEP.

Paper Details

Date Published: 8 September 2004
PDF: 14 pages
Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); doi: 10.1117/12.549458
Show Author Affiliations
Eric A. Meulenkamp, Royal Philips Electronics (Netherlands)
Rajan van Aar, Royal Philips Electronics (Netherlands)
Jolanda J. A. M. Bastiaansen, TNO Inustrial Technology (Netherlands)
A. J.M. van den Biggelaar, Royal Philips Electronics (Netherlands)
Herbert Borner, Royal Philips Electronics (Netherlands)
Klemens Brunner, Royal Philips Electronics (Netherlands)
Michael Buchel, Royal Philips Electronics (Netherlands)
Addy van Dijken, Royal Philips Electronics (Netherlands)
Nicole M. M. Kiggen, TNO Industrial Technology (Netherlands)
Mary Kilitziraki, Royal Philips Electronics (Netherlands)
Margreet M. de Kok, Royal Philips Electronics (Netherlands)
Bea M.W. Langeveld, TNO Industrial Technology (Netherlands)
Marcel P. H. Ligter, Royal Philips Electronics (Netherlands)
Simone I. E. Vulto, Royal Philips Electronics (Netherlands)
Peter van de Weijer, Royal Philips Electronics (Netherlands)
Suzanne H. P. M. de Winter, Royal Philips Electronics (Netherlands)


Published in SPIE Proceedings Vol. 5464:
Organic Optoelectronics and Photonics
Paul L. Heremans; Michele Muccini; Hans Hofstraat, Editor(s)

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