ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
ChemRxiv - Welch - PDI OLED Large Area Final.pdf (1.39 MB)
0/0

Interlayer Engineering of Flexible and Large Area Red Organic Light Emitting Diodes Based on a N-Annulated Perylene Diimide Dimer

preprint
submitted on 07.10.2019 and posted on 11.10.2019 by Mohammad Rahmati, Majid Pahlevani, Gregory Welch

Flexible red OLEDs based on a quadruple layer stack in-between electrodes with 160 mm2 active area were fabricated in ambient air on PET via slot-die coating. For the OLED structure PET/ITO/PEDOT:PSS/PVK/PFO:tPDI2N-EH/ZnO/Ag the ink formulations and coating parameters for each layer were systematically evaluated and optimized. The air-stable red-light emitting material tPDI2N-EH was successfully utilized as blended homogeneous film with PFO for the emitting layer. The use of an organic hole-transport layer (PVK) and inorganic electron injection layer (ZnO) significantly improved the brightness of the reference device from 4 cd/m2 to 303 cd/m2. Surface analysis using AFM measurements showed that PVK interlayer reduced the surface roughness of the hole injection layer (PEDT:PSS) from 0.45 nm to 0.17 nm, which improved the ability to form uniform emitting layers on top. In addition, the ZnO interlayer improved the average roughness of the device from 1.26 nm to 0.85 nm and reduced the turn-on voltage of the device from 5.0 V to 2.8 V.

History

Email Address of Submitting Author

gregory.welch@ucalgary.ca

Institution

University of Calgary

Country

Canada

ORCID For Submitting Author

0000-0002-3768-937X

Declaration of Conflict of Interest

None

Exports