High-efficiency polymer LEDs : triplets and novel devices

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

doi:10.1117/12.549458

8 September 2004 High-efficiency polymer LEDs : triplets and novel devices

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

Author Affiliations +

Proceedings Volume 5464, Organic Optoelectronics and Photonics; (2004) https://doi.org/10.1117/12.549458
Event: Photonics Europe, 2004, Strasbourg, France

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.

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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, and Suzanne H. P. M. de Winter "High-efficiency polymer LEDs : triplets and novel devices", Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); https://doi.org/10.1117/12.549458

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