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Energy level alignment at the interfaces in a multilayer organic light-emitting diode structure

 
: Olthof, S.; Meerheim, R.; Schober, M.; Leo, K.

:

Physical Review. B 79 (2009), Nr.24, Art. 245308, 7 S.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Englisch
Zeitschriftenaufsatz
Fraunhofer IPMS ()

Abstract
We use photoelectron spectroscopy to study the electronic structure and energy level alignment throughout an organic light-emitting diode. The structure under investigation is a state-of-the-art long-living red phosphorescent device composed of doped charge-injection layers, charge-blocking layers, and an emission layer. By consecutively building up the whole device, the key parameters of every interface are measured. Our results show that the doped layers have a significant influence on the device energetics, especially in controlling the built-in potential, and that there are mostly only small dipoles present at the interfaces of the intrinsic organic layers.

: http://publica.fraunhofer.de/dokumente/N-145860.html