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Proceedings Paper

Concepts for high efficient white OLEDs for lighting applications
Author(s): A. Hunze; R. Krause; S. Seidel; O. Weiss; F. Kozlowski; G. Schmid; J. Meyer; M. Kröger; H. H. Johannes; W. Kowalsky; T. Dobbertin
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Paper Abstract

Apart from usage of organic light emitting diodes for flat panel display applications OLEDs are a potential candidate for the next solid state lighting technology. One key parameter is the development of high efficient, stable white devices. To realize this goal there are different concepts. Especially by using highly efficient phosphorescent guest molecules doped into a suitable host material high efficiency values can be obtained. We started our investigations with a single dopant and extended this to a two phosphorescent emitter approach leading to a device with a high power efficiency of more than 25 lm/W @ 1000 cd/m2. The disadvantage of full phosphorescent device setups is that esp. blue phosphorescent emitters show an insufficient long-term stability. A possibility to overcome this problem is the usage of more stable fluorescent blue dopants, whereas, due to the fact that only singlet excitons can decay radiatively, the efficiency is lower. With a concept, proposed by Sun et al.1 in 2006, it is possible to manage the recombination zone and thus the contribution from the different dopants. With this approach stable white color coordinates with sufficient current efficiency values have been achieved.

Paper Details

Date Published: 16 October 2007
PDF: 11 pages
Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 665511 (16 October 2007); doi: 10.1117/12.731599
Show Author Affiliations
A. Hunze, Siemens AG (Germany)
R. Krause, Siemens AG (Germany)
Univ. of Erlangen-Nuremberg (Germany)
S. Seidel, Siemens AG (Germany)
Univ. of Erlangen-Nuremberg (Germany)
O. Weiss, Siemens AG (Germany)
Technical Univ. of Darmstadt (Germany)
F. Kozlowski, Siemens AG (Germany)
G. Schmid, Siemens AG (Germany)
J. Meyer, Technische Univ. Braunschweig (Germany)
M. Kröger, Technische Univ. Braunschweig (Germany)
H. H. Johannes, Technische Univ. Braunschweig (Germany)
W. Kowalsky, Technische Univ. Braunschweig (Germany)
T. Dobbertin, Osram Opto Semiconductors GmbH (Germany)

Published in SPIE Proceedings Vol. 6655:
Organic Light Emitting Materials and Devices XI
Zakya H. Kafafi; Franky So, Editor(s)

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