Universal Polymeric Bipolar Hosts for Highly Efficient Solution-Processable Blue and Green Thermally Activated Delayed Fluorescence OLEDs Jin Hyo Hwang, Chae Yeong Kim, Hyunchul Kang, Ji-Eun Jeong, Han Young Woo, Min Ju Cho, Sungnam Park and Dong Hoon Choi Abstract In this study, two polymeric host materials, P(NmCP) and P(mCP), were synthesized, and high-performing sky-blue and green thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs) were achieved.