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

Publié le 29 mars 2018
Bright and efficient inverted organic light-emitting diodes with improved solution-processed electron-transport interlayers
Auteurs
Murat Y., Langer E., Barnes J.-P., Laurent J.-Y., Wantz G., Hirsch L., Maindron T.
Year2017-0434
Source-TitleOrganic Electronics: physics, materials, applications
Affiliations
Univ. Bordeaux, IMS, UMR CNRS 5218, Bordeaux INP/ENSCBP, 16 Av. Pey Berland, Pessac, France, Université de Grenoble-Alpes, CEA Leti, MINATEC Campus, 17 Rue des Martyrs, Grenoble, France
Abstract
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. © 2017 Elsevier B.V.
Author-Keywords
Binary blend, Inverted OLEDs, Polyethylenimine ethoxylated (PEIE), TOF-SIMS, Wet-process
Index-Keywords
Conjugated polymers, Efficiency, Light emitting diodes, Mass spectrometry, Organic light emitting diodes (OLED), Shotcreting, Binary blends, Inverted OLEDs, Polyethylenimine ethoxylated, ToF SIMS, Wet process, Secondary ion mass spectrometry
ISSN15661199
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