Improving the efficiency of red phosphorescent organic light emitting diodes by exciton management

Autor: Yi-Lu Chang, D. P. Puzzo, Zheng-Hong Lu, Jacky Qiu, Zhibin Wang, Jeffrey S. Castrucci, Michael G. Helander
Rok vydání: 2012
Předmět:
Zdroj: physica status solidi c. 9:2537-2540
ISSN: 1610-1642
1862-6351
DOI: 10.1002/pssc.201200294
Popis: Phosphorescent organic light emitting diodes (PHOLEDs) have undergone remarkable development from both academia and industry in the past decade. Nevertheless, devices with higher efficiency remain highly desirable for energy-efficient general lighting as well as low power consumption LED backlight applications. In this respect, several groups have conducted complex device engineering designs such as doping of the transport layers to increase charge carrier mobility, incorporation of blocking layers to confine excitons/charge carriers, or use of multiple emissive layers to widen the emission zone, in order to achieve higher device performances. In this work, we report an alternative and relatively simple approach to improve the efficiency of red PHOLEDs by exciton management to attain a high external quantum efficiency (EQE) of >20%. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Databáze: OpenAIRE
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