Premium
Novel Red Light‐Emitting Fluorene‐ alt ‐Carbazole Copolymers with Carbazole N ‐Graft Cyclometalated Ir Complexes
Author(s) -
Ying Lei,
Zou Jianhua,
Yang Wei,
Wu Hongbin,
Zhang Anqi,
Wu Zhonglian,
Cao Yong
Publication year - 2009
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200800482
Subject(s) - carbazole , fluorene , polyfluorene , copolymer , homo/lumo , polymer chemistry , photochemistry , materials science , chemistry , alkyl , isoquinoline , stereochemistry , polymer , organic chemistry , molecule
A series of electrophosphorescent fluorene‐ alt ‐carbazole copolymers are synthesized by Suzuki polycondensation. A β ‐diketone‐terminated alkyl chain grafted to the N ‐position of carbazole serves as a ligand to form a pendant cyclometalated Ir complex with 10‐methyl‐dibenzo[ a , c ]phenazine (Mpq), 2,3‐diphenylquinoxaline (Bpq), and 1‐(benzo[ b ]thiophen‐2‐yl)isoquinoline (Biq), respectively. The emission of the device of PFCzIrBiq peaked at 715 and 790 nm, which is among the deepest red emissions reported so far. The well‐achieved device performances could be attributed to a combination of a higher triplet energy and suitable HOMO/LUMO energy levels which can assure efficient charge injection as a result of the incorporation of a 3,6‐carbazole unit into a polyfluorene backbone.