Dr. Dongdong Zhang received his Ph.D.from the Department of Chemistry, Tsinghua University in 2016, under the supervision of Prof. Yong Qiu and Prof. Lian Duan. He is currently a research associate in the Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education in Tsinghua University. His research interests focus on developing new TADF materials as emitters or hosts for highperformance OLEDs.