Effect of Host Molecular Weight on Device Performance in Solution-Processed TADF-OLEDs Using Sterically Shielded MR Emitters
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Solution-processed OLEDs offer advantages such as reduced material consumption and simplified processing. In these devices, film-forming properties are crucial for creating stable and uniform layers, influenced by the molecular weight of the materials used in the emissive layer. We synthesized two CzCzPh-based hosts with varying molecular weights using sigma (σ) linkers, including cyclohexane and vinyl polymer backbones. Along with the CzCzPh-mAd host, these three hosts possess similar frontier molecular orbitals, photophysical property, and energy levels of the CzCzPh core due to their non-conjugated linkers. These hosts exhibit high triplet energies, allowing for the use of various emitters. Consequently, we employed 4FlDABNA, a sterically shielded MR-TADF blue emitter, to fabricate solution-processed TADF-OLEDs. This study highlights how varying molecular weights of hosts impact OLED device performance and emphasizes the significance of structural design in solution processing.