A four dibenzofuran-terminated hole-transporter, T1DBFBP, realizes high-efficiency and highly stable green TADF OLEDs with an EQE of over 20% and a long operation lifetime LT50 of 30 000 h at 1000 cd m−2.
Solution-processable bipolar materials acting as hosts, soluble in common organic solvents, are key materials for thermally activated delayed fluorescence (TADF) emitters.
A green hyper OLED with CIE (0.31, 0.66), 159.9 lm W−1, and LT95/90 lifetimes of 600/2400 hours at 1000 cd m−2 was developed by preventing carrier trapping with MR-TADF emitter at hole-transporter/emission layer interface.
The design and synthesis of efficient charge transporting and TADF materials for OLEDs is a real challenge, and serious considerations are required.
Chemical modifications of a multi-resonance thermally activated delayed fluorescence emitter based on the BNCz framework are reviewed.