Rare-earth metal 8-hydroxyquinolinate complexes as materials for organic light-emitting diodes

摘要

Rare-earth metal 8-hydroxyquinolinates (q) were studied as emission layers for organic light-emitting diodes. Compounds Dyq3, Tbq3, and Smq3 possess weak electroluminescence due to the emission of the ligand, and the electroluminescence of Hoq3, Tmq3, and Ybq3 is due to electronic transitions of the lanthanide ion. The best electroluminescence characteristics were demonstrated by Scq3 and Yq3 The power efficiency of the organic light emitter based on ITO/TPD/Scq3/Yb (ITO is tin-alioyed indium oxide, TPD is N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine) is 2.6 1m W~(-1) at a luminance of the device of 300 cd m~(-2).