Highly efficient single-layer dendrimer light-emitting diodes with balanced charge transport

TitleHighly efficient single-layer dendrimer light-emitting diodes with balanced charge transport
Publication TypeJournal Article
Year of Publication2003
AuthorsAnthopoulos, T. D., Markham J. P. J., Namdas E., Samuel I. D. W., Lo S. C., and Burn P. L.
JournalApplied Physics Letters
Volume82
Issue26
Pagination4824–4826
AbstractHigh-efficiency single-layer-solution-processed green light-emitting diodes based on a phosphorescent dendrimer are demonstrated. A peak external quantum efficiency of 10.4% (35 cd/A) was measured for a first generation fac-tris(2-phenylpyridine) iridium cored dendrimer when blended with 4,4(')-bis(N-carbazolyl)biphenyl and electron transporting 1,3,5-tris(2-N-phenylbenzimidazolyl)benzene at 8.1 V. A maximum power efficiency of 12.8 lm/W was measured also at 8.1 V and 550 cd/m2. These results indicate that, by simple blending of bipolar and electron-transporting molecules, highly efficient light-emitting diodes can be made employing a very simple device structure. (C) 2003 American Institute of Physics.
DOI10.1063/1.1586999