Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 111, Issue 3, Pages 1166-1175Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp064819w
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A series of pi-conjugated chelating polymers with charged iridium (Ir) complex units based on 1,10-phenanthroline in the backbones were synthesized by Suzuki polycondensation, and homogeneous polymeric phosphorescent materials were obtained. 3,8-Dibromo-1,10-phenanthroline served as an (NN)-N-boolean AND ligand to form a charged Ir complex monomer with 1-(9,9-dioctylfluorene-2-yl)isoquinoline (Fiq) as the cyclometalated ligands. Chemical and photophysical characterization confirmed that the Ir complex was incorporated into the backbones as one of the repeat units. Chelating polymers showed efficient energy transfer from the host to the guest in the solid state, and almost complete energy transfer was realized when the feed ratio of the Ir complex monomer was 4 mol %. All chelating polymers displayed good thermal stability, redox reversibility, and film-forming properties. Polymer light-emitting diodes using chelating polymer without carbazole units (phen-PFOIr2) and chelating polymer with carbazole units (phen-PFOCzIr2) as the light-emitting layers were fabricated, and saturated-red electrophosphorescence was achieved.
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