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Proceedings Paper

Highly efficient inverted top-emitting organic electroluminescent devices with doped charge transport layers
Author(s): Michael Thomschke; Mauro Furno; Björn Lüssem; Karl Leo
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Paper Abstract

We report on monochrome top emitting organic light emitting diodes (OLEDs) with inverted layer structure and discuss the optical and electrical optimization of OLED devices comprising the orange phosphorescent emitter Ir(MDQ)2(acac). We show that first, charge balance within the emitting layer is an important factor for efficient generation of light and second, optical outcoupling is a critical issue in top-emitting devices. We demonstrate the use of doped charge transport layers for efficient injection of charge carriers and optical modeling to improve outcoupling. The latter one is done via optimized cavity tuning and application of a dielectric capping layer. Finally, driving voltages of 4.2V at 1000 cd/m2, 19 lm/W and 17% external quantum efficiency (EQE) from devices made on metal substrates are reached.

Paper Details

Date Published: 18 May 2010
PDF: 10 pages
Proc. SPIE 7722, Organic Photonics IV, 77220R (18 May 2010); doi: 10.1117/12.854183
Show Author Affiliations
Michael Thomschke, Technische Univ. Dresden (Germany)
Mauro Furno, Technische Univ. Dresden (Germany)
Björn Lüssem, Technische Univ. Dresden (Germany)
Karl Leo, Technische Univ. Dresden (Germany)

Published in SPIE Proceedings Vol. 7722:
Organic Photonics IV
Paul L. Heremans; Reinder Coehoorn; Chihaya Adachi, Editor(s)

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