Bipolar Polymeric Hosts for Highly Efficient Solution-Processable Blue and Green Thermally Activated Delayed Fluorescence OLEDs
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초록
내용
Two polymeric host materials, P(NmCP) and P(mCP), were synthesized to achieve sky-blue and green-emitting thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs) with high device performance via a solution process. The simple structure polymer host was designed by inserting similar electron donating groups and different cores with phenyl and pyridine units, respectively. The two polymeric hosts exhibited high triplet energies (T1 = 3.04 eV for P(NmCP) and 3.05 eV for P(mCP)), which were sufficiently high to realize blue and green TADF-OLEDs. In brief, solution-processed OLEDs with an emissive layer bearing P(NmCP) as a bipolar electron host exhibited remarkable performance with maximum external quantum efficiency (EQE) of 20.07% in the green-emitting device. In the blue-emitting device, we obtained a maximum EQE of 10.70%, respectively.