What They Say
The University of Rennes, France, has developed what it believes to be the world’s most efficient single-layer PHOLED emitter with an EQE of more than 22%. The group said that in its simplified PhOLED technology, the role of the functional layer should be done by the emissive layer, which should allow an excellent injection, transport and recombination of holes and electrons.
The University said that thanks to a rational molecular design of the emissive layer, the group reported a green emitting Single-Layer PhOLED displaying a very high external quantum efficiency of 22.7 %. This performance is, to the best of its knowledge, the highest reported for single-Layer PhOLED (all colours considered). The impact of the phosphorescent emitter on the ambipolarity of the charge transport is particularly evidenced and appear as a key concept in the high performance reached.
Reference
Lucas, F.*; Brouillac, C.; Fall, S.; Zimmerman, N.; Tondelier, D.; Geffroy, B.; Leclerc, N.; Heiser, T.; Lebreton, C.; Jacques, E.; Quinton, C.; Rault-Berthelot, J.; Poriel, C.*
Simplified Green-Emitting Single-Layer Phosphorescent Organic Light-Emitting Diodes with an External Quantum Efficiency > 22%
Chem. Mater. 2022, 34, 18, 8345-8355.
What We Think
You might be surprised to see work from this university, but Rennes was the home of the Thomson R&D (and subsequently Technicolor and others) and the area has a surprising level of technology.
We’re planning a deeper dive into this topic as simplifying OLED structures would be a significant development in the technology. (BR)
