
Proceedings Paper
Efficiency and lifetime enhancement of phosphorescent organic devicesFormat | Member Price | Non-Member Price |
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Paper Abstract
A way to reach highly efficient and stable red bottom emission organic light emitting diodes (OLEDs) is the use
of doped transport layers, charge and exciton blockers, and phosphorescent emitter materials to combine low
operating voltage and high quantum yield. We will show how efficiency and lifetime of such devices can be
further increased.
In our contribution, we report on highly efficient red p-i-n type organic light emitting diodes using an iridium-based
electrophosphorescent dye, Ir(MDQ)2(acac), doped in α-NPD as host material. By proper adjustment of
the hole blocking layer, the device performance may be enhanced to 20 % external quantum efficiency at an
operation voltage of 2.4 V and a brightness of 100 cd/m2. At the same time, a power efficiency of 37.5 lm/W is
reached. The quantum efficiency is well above previously reported values for this emitter. We attribute this high
efficiency to a combination of a well-adjusted charge carrier balance in the emission layer and a low current
density needed to reach a certain luminance due to the use of doped transport layers. High chemical stability of
the blocker material assures a long device lifetime of 32.000 hours at 1.000 cd/m2 initial luminance.
Paper Details
Date Published: 16 April 2008
PDF: 9 pages
Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 699917 (16 April 2008); doi: 10.1117/12.781947
Published in SPIE Proceedings Vol. 6999:
Organic Optoelectronics and Photonics III
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)
PDF: 9 pages
Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 699917 (16 April 2008); doi: 10.1117/12.781947
Show Author Affiliations
Rico Meerheim, Technische Univ. Dresden (Germany)
Sebastian Scholz, Technische Univ. Dresden (Germany)
Gregor Schwartz, Technische Univ. Dresden (Germany)
Sebastian Reineke, Technische Univ. Dresden (Germany)
Sebastian Scholz, Technische Univ. Dresden (Germany)
Gregor Schwartz, Technische Univ. Dresden (Germany)
Sebastian Reineke, Technische Univ. Dresden (Germany)
Selina Olthof, Technische Univ. Dresden (Germany)
Karsten Walzer, Technische Univ. Dresden (Germany)
Karl Leo, Technische Univ. Dresden (Germany)
Karsten Walzer, Technische Univ. Dresden (Germany)
Karl Leo, Technische Univ. Dresden (Germany)
Published in SPIE Proceedings Vol. 6999:
Organic Optoelectronics and Photonics III
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)
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