Abstract
In this work, boosting deep-blue organic light-emitting-diodes performance via tailoring interfacial contact is realized. A deep-blue thermally activated delayed fluorescent (TADF) material, TDBA-Ac, was used as the emitter. The exciton-blocking layer suppresses the exciton diffusion, and the double interlayers at the hole transport layer/emission layer (HTL/EML) interface balance the carrier distribution by modifying the interface energetics and the EML morphology. These strategies result in a luminance up to 3308 cd/m2, a current efficiency up to 14.1 cd/A, and external quantum efficiencies up to 10.7% with color coordinates as low as CIEy = 0.15. This work provides an efficient and facile approach for improving the device performance of deep-blue TADF OLEDs.
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