一类以菲衍生物为配体的新型红色到近红外磷光配合物的合成及其光致和电致发光性质

Novel red to near-infrared phosphorescent complexes based on phenanthrene derivates as ligands: synthesis, characterization and photoluminescence and electroluminescence properties

以2-(菲-9)-吡啶、1-(菲-9)异喹啉和喹喔啉并[2,3-l]菲为配体,合成了3个新颖的红色到近红外磷光配合物(pypt)2Ir(acac)、(sqpt)2Ir(acac)和(qupt)2Ir(acac).对这些配合物的吸收、发射光谱和电化学性质进行了研究,结果发现,菲取代基的性质主要影响配合物的LUMO能级,随着菲取代基共轭程度的增加,吸收光谱和发射光谱红移,光致发光(PL)光谱从619 nm红移到704 nm.将4%的(sqpt)2Ir(acac)掺杂在PVK+PBD主体材料中制备了掺杂磷光发光器件,器件电致发光(EL)光谱的λmax为704 nm,器件的EL光谱从红色一直延伸到近红外区域.

A new series of red to near-infrared phosphorescent complexes,（pypt）2Ir（acac）,（sqpt）2Ir（acac） and（qupt）2Ir（acac）, based on 2-（phenanthren-9-yl）pyridine（pyptH）, 1-（phenanthren-9-yl） isoquinoline（sqptH） and quinoxalino[2,3-l]phenanthrene（quptH） as ligands were synthesized. The absorption, luminescence and electrochemical properties of these complexes showed that LUMO energy level significantly decreased with π-conjugate extension of the substitutes on phenanthrene ring, but neglectable affection for HOMO energy level. The π-conjugate extension of the ligand in complexes results in red-shift in absorption and emission of complexes. The complexes exhibited intense phosphorescence in room temperature, with λmax = 619 nm for（pypt）2Ir（acac）, 690 nm for（sqpt）2Ir（acac） and 704 nm for（qupt）2Ir（acac）. Red to near infrared phosphorescent organic light-emitting diodes were fabricated by doping 4%（sqpt）2Ir（acac） into host of PVK and PBD. EL spectra had λmax at 704 nm, and extend into near infrared region.