Bipolar and Unipolar Silylene-Diphenylene σ-π Conjugated Polymer Route for Highly Efficient Electrophosphorescence.

ABSTRACT: σ-π conjugated polymer strategy is proposed for designing electroluminescent host polymers with silylene-diphenylene as the backbone repeat unit giving a high triplet energy (E_T = 2.67 eV). By incorporation of high E_T (3.0 eV) electron (oxadiazole, OXD) and hole (triphenyl amine, TPA) transport moieties, or TPA alone (in this case, the main chain acts as electron transport channel) as side arms on the silylene, the high E_T bipolar and unipolar polymers are formed, allowing a use of iridium green phosphor (Ir(ppy)₂(acac), Ir-G) (E_T = 2.40 eV) as the dopant. The matching of energy levels of the dopant with the hosts, leading to charge trapping into it; and singlets and triplets of the exciplex and excimer can be harvested via energy tran

SUBMITTER: Chang YT 

PROVIDER: S-EPMC5133549 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature