Synthesis and Characterization of New Polymeric Hosts with High T<sub>1</sub> Energy: Utilization in Solution-Processed TADF-OLEDs
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Solution-processed organic light-emitting diodes (OLEDs) have many advantages to cost-effectiveness, flexibility, and suitability for large-area production. And hosts for solution-process OLED put forward high demands for the thermal stability and film-forming ability. In that regard, polymeric hosts have considerable potential in solution-processed OLEDs. In this work, new polymeric hosts bearing carbazole-dibenzothiophene-based pendants were synthesized via radical polymerization. These two polymers showed high thermal stability and good solubility in various aromatic and halogenated organic solvents. So, they can obtain smooth film surface morphology. And they have high triplet energies (> 3.0eV), which were sufficiently high to apply to blue and green thermally activated delayed fluorescence (TADF) emitter. Furthermore, two polymeric hosts showed suitable energy levels as a host. Eventually, these polymeric hosts were employed to fabricate solution-processed TADF-OLEDs.