Spirophenylacridine‐2,7‐(diphenylphosphineoxide)‐fluorene: A Bipolar Host for High‐Efficiency Single‐Layer Blue Phosphorescent Organic Light‐Emitting Diodes

Fabien Lucas (1) , Olzhas Ibraikulov (2) , Cassandre Quinton (1) , Lambert Sicard (1) , Thomas Heiser (3) , Denis Tondelier (4) , Bernard Geffroy (5, 4) , Nicolas Leclerc (6) , Joëlle Rault‐berthelot (1) , Cyril Poriel (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 ICube - Laboratoire des sciences de l'ingénieur, de l'informatique et de l'imagerie
3 InESS - Institut d'Electronique du Solide et des Systèmes
4 LPICM - Laboratoire de physique des interfaces et des couches minces [Palaiseau]
5 LICSEN - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
6 ICPEES - Institut de chimie et procédés pour l'énergie, l'environnement et la santé

Herein, a high-efficiency host material for single-layer phosphorescent organic light-emitting diodes (SL-PhOLEDs) is reported. This host material is synthesized via an efficient approach and is constructed on the association of an electron-rich phenylacridine unit connected by a spiro carbon atom to an electron-deficient 2,7-bis(diphenylphosphineoxide)-fluorene. In addition to a high ET value and adequate highest occupied molecular orbital/lowest unoccupied molecular orbital energy levels, the key point in this molecular design is the suitable balance between hole and electron mobilities, which leads to a high-performance blue SL-PhOLED with an external quantum efficiency of 17.6% (current efficiency = 37.8 cd A−1 and power efficiency = 37.1 lm W−1) and a low Von of 2.5 V. This performance shows that the molecular design of the present host fulfills the criteria required for high-efficiency SL-PhOLEDs. The present performance is one of the highest reported to date for blue SL-PhOLEDs and more importantly shows the potential of such a molecular design to reach very high-performance single-layer devices.

Keywords: high E T host materials; Single-layer blue phosphorescent organic light-emitting diode; ambipolar charge transport; spiro compounds

Domains: Material chemistry

Fabien Lucas, Olzhas Ibraikulov, Cassandre Quinton, Lambert Sicard, Thomas Heiser, et al.. Spirophenylacridine‐2,7‐(diphenylphosphineoxide)‐fluorene: A Bipolar Host for High‐Efficiency Single‐Layer Blue Phosphorescent Organic Light‐Emitting Diodes. Advanced Optical Materials, 2020, 8 (2), pp.1901225. ⟨10.1002/adom.201901225⟩. ⟨cea-02354953⟩