Thermally Activated Delayed Fluorescence Emitters with Intramolecular Proton Transfer for High Luminance Solution-Processed Organic Light-Emitting Diodes

We report an organic emitter containing a β-triketone electron acceptor core and phenoxazine as the donors (TPXZBM) for solution-processed light-emitting diodes (OLEDs). The resulting molecule is very unusual because it shows both thermally activated delayed fluorescence intramolecular proton transfer. compare its performance with previously reported diketone analogue PXZPDO. Solution-processed OLEDs of PXZPDO TPXZBM show maximum external quantum efficiencies 20.1 12.7%, respectively. results obtained PXZPDO-based device are good evaporated device. At high luminance 10,000 cd m–2, were 10.6% 4.7% TPXZBM, demonstrating relatively low efficiency roll-off TADF materials. was rationalized on basis short lifetimes 1.35 μs 1.44 TPXZBM. Our suggest that transfer may be useful design OLED materials roll-off.