title: Tetraphenylborate versus tetraimidazolylborate as counterions for cationic iridium(III) complexes: enhanced electrochemical stabilities and electroluminescence.
abstract: Tetraimidazolylborate is first used as the counterion of two novel ionic iridium complexes, instead of tetraphenylborate. Both the electrochemical stabilities and electroluminescence are sharply improved. Organic light-emitting diodes have been successfully fabricated with a high current efficiency of 9.48 cd A(-1) and a maximum brightness of 5163 cd m(-2).
authors.affiliation: Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China. duanl@mail.tsinghua.edu.cn.
authors.forename: Dongxin
authors.initials: D
authors.lastname: Ma
authors.forename: Lian
authors.initials: L
authors.lastname: Duan
authors.forename: Yong
authors.initials: Y
authors.lastname: Qiu