A new molecular design approach for very high efficiency White Phosphorescent OLEDs. A first step towards simplified devices

This news deals with a unique molecular approach to design new generations of high efficiency White Phosphorescent OLEDs. The devices performances obtained are among the highest reported to date in the literature and open new avenues to simplify the PhOLED technology, a key step for the ecological transition.
Pure Hydrocarbon Materials as Highly Efficient Host for White Phosphorescent OLEDs: A New Molecular Design Approach

To date, all efficient host materials reported for phosphorescent OLEDs (PhOLEDs) are constructed with heteroatoms, which have a crucial role in the device performance. However, it has been shown in recent years that the heteroatoms not only increase the design complexity but can also be involved in the instability of the PhOLED, which is nowadays the most important obstacle to overcome. In this work, we have designed pure aromatic hydrocarbon materials (PHC) as very efficient hosts in high-performance white and blue PhOLEDs. With EQE of 27.7 %, the PHC-based white PhOLEDs display similar efficiency as the best reported with heteroatom-based hosts. Incorporated as a host in a blue PhOLED, which are still the weakest links of the technology, a very high EQE of 25.6 % is reached, surpassing, for the first time, the barrier of 25 % for a PHC and FIrpic blue emitter. This performance shows that the PHC strategy represents an effective alternative for the future development of the OLED industry.

Reference

  • Kong, F.-C.; Zhang, Y.-L.; Quinton, C.; McIntosh, N.; Yang, S.-Y.; Rault-Berthelot, J.; Lucas, F.; Brouillac, C.; Jeannin, O.; Cornil, J.; Jiang, Z.-Q.; Liao, L.-S.; Poriel, C.
    Pure Hydrocarbon Materials as Highly Efficient Host for White Phosphorescent Organic Light-Emitting Diodes: A New Molecular Design Approach
    Angew. Chem. Int. Ed. n/a, e202207204 (VIP) - https://doi.org/10.1002/anie.202207204

Financement

  • ANR (n°19-CE05-0024), ADEME (Ecoelec)

Contact

  • Cyril Poriel, Univ Rennes, CNRS, ISCR-6226, F-35000 Rennes, France
    cyril [dot] porielatuniv-rennes1 [dot] fr

 

Published July 22, 2022