Bright and efficient inverted organic light-emitting diodes with improved solution-processed electron-transport interlayers

Highly efficient inverted organic light-emitting diodes (iOLEDs) are reported by including in the structure a surface modifier, polyethylenimine-ethoxylated (PEIE), to decrease the cathode work function and a hole blocking layer, 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBi) to increase the ef...

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Bibliographic Details
Published in:Organic electronics 2017-09, Vol.48, p.377-381
Main Authors: Murat, Yolande, Langer, Eric, Barnes, Jean-Paul, Laurent, Jean-Yves, Wantz, Guillaume, Hirsch, Lionel, Maindron, Tony
Format: Article
Language:English
Subjects:
Binary blend
Electronics
Engineering Sciences
Inverted OLEDs
Optics
Photonic
Polyethylenimine ethoxylated (PEIE)
TOF-SIMS
Wet-process
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Summary:Highly efficient inverted organic light-emitting diodes (iOLEDs) are reported by including in the structure a surface modifier, polyethylenimine-ethoxylated (PEIE), to decrease the cathode work function and a hole blocking layer, 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBi) to increase the efficiency of the device. The two compounds have been processed in a single step, by using a mixture PEIE:TPBi spun from the same solution. It is demonstrated by time-of-flight secondary-ion mass spectrometry (TOF-SIMS) that a bilayer is formed and same performances as the separately processed materials are obtained. This technic enables to reach high luminances (40 000 cd m−2) and high current efficiencies (13 cd/A) using the conjugated Super Yellow (SY) polymer as the emissive layer while reducing the number of processing steps. [Display omitted] •Efficient inverted OLEDs built from a binary blend of PEIE and TPBi.•The binary blend is solution-processed via one single coating step.•Formation of a self-segregated PEIE/TPBi bi-layer on ZnO.
ISSN:1566-1199
1878-5530
DOI:10.1016/j.orgel.2017.04.023