Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission

Chan, CY., Tanaka, M., Lee, YT. et al.

Nat. Photonics (2021).

https://doi.org/10.1038/s41566-020-00745-z

Organic light-emitting diodes (OLEDs) are a promising light-source technology for future generations of display. Despite great progress it is still challenging to produce blue OLEDs with sufficient colour purity, lifetime and efficiency for applications. This study presents a “3-component blue EML (new TADF assistant dopant; v-DABNA as (TADF)-narrow emitter; mCBP host) with pure color thanks to DABNA, but also higher EQE and LT95 thanks to the new emitter and the 3-component system. Use of the blue EML in a tandem configuration yielded an even higher EQE of 41%, lower CIEy coordinate (more blue) and better LT95 of >300 h (everything at 100 cd/m^2)." The Setfos Emission module was used for the emitter orientation fit. DABNA is more orientated than new emitter, yielding a higher EQE in the ternary EML.