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Proceedings Paper

Highly efficient white OLEDs for lighting applications
Author(s): Sven Murano; Markus Burghart; Jan Birnstock; Philipp Wellmann; Martin Vehse; Ansgar Werner; Tobias Canzler; Thomas Stübinger; Gufeng He; Martin Pfeiffer; Herbert Boerner
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Paper Abstract

The use of organic light-emitting diodes (OLEDs) for large area general lighting purposes is gaining increasing interest during the recent years. Especially small molecule based OLEDs have already shown their potential for future applications. For white light emission OLEDs, power efficiencies exceeding that of incandescent bulbs could already be demonstrated, however additional improvements are needed to further mature the technology allowing for commercial applications as general purpose illuminating sources. Ultimately the efficiencies of fluorescent tubes should be reached or even excelled, a goal which could already be achieved in the past for green OLEDs.1 In this publication the authors will present highly efficient white OLEDs based on an intentional doping of the charge carrier transport layers and the usage of different state of the art emission principles. This presentation will compare white PIN-OLEDs based on phosphorescent emitters, fluorescent emitters and stacked OLEDs. It will be demonstrated that the reduction of the operating voltage by the use of intentionally doped transport layers leads to very high power efficiencies for white OLEDs, demonstrating power efficiencies of well above 20 lm/W @ 1000 cd/m2. The color rendering properties of the emitted light is very high and CRIs between 85 and 95 are achieved, therefore the requirements for standard applications in the field of lighting applications could be clearly fulfilled. The color coordinates of the light emission can be tuned within a wide range through the implementation of minor structural changes.

Paper Details

Date Published: 8 October 2005
PDF: 8 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 59370H (8 October 2005); doi: 10.1117/12.614075
Show Author Affiliations
Sven Murano, Novaled GmbH (Germany)
Markus Burghart, Novaled GmbH (Germany)
Jan Birnstock, Novaled GmbH (Germany)
Philipp Wellmann, Novaled GmbH (Germany)
Martin Vehse, Novaled GmbH (Germany)
Ansgar Werner, Novaled GmbH (Germany)
Tobias Canzler, Novaled GmbH (Germany)
Thomas Stübinger, Novaled GmbH (Germany)
Gufeng He, Technische Univ. Dresden (Germany)
Martin Pfeiffer, Technische Univ. Dresden (Germany)
Herbert Boerner, Philips Research Labs. (Germany)

Published in SPIE Proceedings Vol. 5937:
Organic Light-Emitting Materials and Devices IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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