7Varatharajan S,Florian B,Stephanie H,etal.Fluorine cleavage of the light blue het-eroleptic triplet emitter flrpic. Journal of Fluorine Chemistry . 2009
8Kido J,Nagai K,Okamoto Y J.High-effi-ciency White Phosphorescent Organic Light-Emitting Diodes. Journal of Alloys and Compounds . 1993
9Jiang X Z,Jen A K Y,,Huang D,et al.Theeffect of ligand conjugation length on europi-um complex performance in light-emittingdiodes. Synth.Matel . 2002
10Sun M,Xin H,Wang K Z,et al.Bright andmonochromic red light-emitting electrolu-minescence devices based on a new ultifunc-tional europium ternary complex. Chemical Communications . 2006
