Highly twisted organic molecules with ortho linkage as the efficient bipolar hosts for sky-blue thermally activated delayed fluorescence emitter in OLEDs

The new host materials based on the ortho-linked carbazole/diphenylpyridine hybrids could realize max. CE of 34.8 cd A−1, PE of 33.1 lm W−1 and EQE of 16.0% in the sky-blue TADF OLEDs.263