title: Rationally investigating the influence of T1 location on electroluminescence performance of aryl amine modified phosphine oxide materials.
abstract: The correspondence between triplet location effect and host-localized triplet-triplet annihilation and triplet-polaron quenching effects was performed on the basis of a series of naphthyldiphenylamine (DPNA)-modified phosphine oxide hosts. The number and ratio of DPNA and diphenylphosphine oxide was adjusted to afford symmetrical and unsymmetrical molecular structures and different electronic environments. As designed, the first triplet (T1 ) states were successfully localized on the specific DPNA chromophores. Owing to the meso- and multi-insulating linkages, identical optical properties and comparable electrical performance was observed, including the same first singlet (S1 ) and T1 energy levels to support the similar singlet and triplet energy transfer and the close frontier molecular orbital energy levels. This established the basis of rational investigation on T1 location effect without interference from other optoelectronic factors.
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education), School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin 150080 (P. R. China), Fax: (+86) 451-86608042.
authors.forename: Chunmiao
authors.initials: C
authors.lastname: Han
authors.forename: Liping
authors.initials: L
authors.lastname: Zhu
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Fangchao
authors.initials: F
authors.lastname: Zhao
authors.forename: Hui
authors.initials: H
authors.lastname: Xu
authors.forename: Dongge
authors.initials: D
authors.lastname: Ma
authors.forename: Pengfei
authors.initials: P
authors.lastname: Yan
keywords: aryl amines; aryl phosphine oxide; electrophosphorescence; quenching; triplet states