CE07 - Chimie moléculaire

Evolution of organic host materials for high performance blue and white phosphorescent OLEDs: New generations of Pure Hydrocarbon materials – Evolution

Submission summary

In emerging Organic Electronic technologies, Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) have encountered a fantastic development. The emitting layer of a PhOLED consists in a triplet emitter (Guest) dispersed into an organic semi-conductor (Host). As the host insures both energy transfers and charges transport within the device, its role is crucial in the performance. For the last 2 decades, the design of high efficiency hosts for blue and white PhOLEDs, which are the weakest links of the technology, has been an intense research field. Despite fantastic progresses, many issues remain to be solve: improving the efficiency and stability and insuring a simplification of the devices, a key point for the ecological transition.
Evolution finds its origin in an important fact of the literature: The most efficient hosts are the bipolar hosts constructed on the association of electron-rich and electron-poor functions. Their complicated structures, however, increase the synthetic and molecular complexity and the production and ecological costs. In addition, the PhOLEDs instability, which is one of the main problem to address at the current stage of development, is caused by the fragile C–N, C–P and C–S bonds of such heteroatoms-based hosts. Designing new generations of high-efficiency host materials, which do not possess any heteroatoms, called pure hydrocarbons (PHC), is therefore highly needed. The goal of Evolution is to develop the next generation of PHC hosts with (i)higher triplet energy (to maximize the energy transfers in the PhOLED), (ii)simpler structure and efficient synthetic accesses (to simplify the technology and reduce its environmental footprint) and (iii)higher mobility (to improve the charge transport). With this novel generation of hosts, both the stability and the performance will be increased (External Quantum Efficiency > 30% is targeted) and the technology significantly simplified. This will lead to a new PHC based PhOLED technology.

Project coordination

Cyril PORIEL (Institut des Sciences Chimiques de Rennes)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

Institute of Functional Nano & Soft Materials (FUNSOM) College of Nano Science and Technology (CNST) Soochow University
IETR Université Rennes 1
ISCR Institut des Sciences Chimiques de Rennes

Help of the ANR 324,784 euros
Beginning and duration of the scientific project: January 2023 - 54 Months

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