TITLE

Role of ultrathin Alq[sub 3] and LiF layers in conjugated polymer light-emitting diodes

AUTHOR(S)
Deng, X. Y.; Tong, S. W.; Hung, L. S.; Mo, Y. Q.; Cao, Y.
PUB. DATE
May 2003
SOURCE
Applied Physics Letters;5/5/2003, Vol. 82 Issue 18, p3104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report that an ultrathin layer of tris-(8-hydroxyquinoline) aluminum (Alq[sub 3]) interposed between a bilayer cathode of LiF/Al and an emissive layer can significantly improve electroluminescence efficiency in a polymer light-emitting device (PLED). At a current density of 35 mA/cm², a poly[2-methoxy-5-(2'-ethyl-hexyloxy)-l,4-phenyl-enevinylene] (MEH-PPV)-based PLED with a cathode of Alq[sub 3]/LiF/Al has a quantum efficiency of 2.5%, considerably higher than that of a MEH-PPV-based PLED with a bare A1 or a LiF/A1 cathode. Interfacial characteristics of MEH-PPV/ LiF/A1 and MEH-PPV/Alq[sub 3]/LiF/A1 were investigated by photoelectron spectroscopy, and the results were used to explain the difference in device performance.
ACCESSION #
9630201

 

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