Highly efficient inverted top-emitting organic electroluminescent devices with doped charge transport layers

Michael Thomschke; Mauro Furno; Björn Lüssem; Karl Leo

doi:10.1117/12.854183

18 May 2010 Highly efficient inverted top-emitting organic electroluminescent devices with doped charge transport layers

Michael Thomschke, Mauro Furno, Björn Lüssem, Karl Leo

Author Affiliations +

Proceedings Volume 7722, Organic Photonics IV; 77220R (2010) https://doi.org/10.1117/12.854183
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

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.

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Michael Thomschke, Mauro Furno, Björn Lüssem, and Karl Leo "Highly efficient inverted top-emitting organic electroluminescent devices with doped charge transport layers", Proc. SPIE 7722, Organic Photonics IV, 77220R (18 May 2010); https://doi.org/10.1117/12.854183

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