P‐122: Low Cross‐Linking Temperature Hole Transport Copolymer with Exemplary Hole Transport Ability for Efficient Solution‐Processed OLED

Abstract

Newly designed and synthesized hole transport material (HTM) composed of thermal cross‐linkable benzocyclobutene (BCB) [(7‐(2‐(4‐vinylbenzyl) oxy)ethoxy) bicyclo[4.2.0]octa‐1(6),2,4‐triene) and charge transport indenocarbazole (IC), having low cross‐ linking temperature of 130 °C and excellent charge transport ability (μh=1.01×10−2 cm2 V−1 s−1 at 4.0×105 Vcm−1 ), is reported in this work. Here, we also accurately predicted the cross‐linking temperature and calculated the charge transport parameters of the HTM through molecular dynamic simulation. Finally, incorporating this new HTM into solution‐processed OLED, 130.5 cdA−1 of current efficiency and 37.3 % of EQE were achieved. This result is one of the best efficiencies for phosphorescent solution‐processed OLED have been reported.