Modification Of 2-Phenylpyridine, β-Diketone Ligand Together With The Synthesis And Properties Of The Iridium, Europium Complexes

Organic light-emitting diodes(OLEDs) have been extensively studied due to their potential applications for low driving voltage,bright color plat panel displays. Organic electrophosphorescent materials,using both singlet and triplet,have been extentively synthesized for highly efficient devices.Heavy metal complexes,especialy Iridium(Ⅲ) and platinum(Ⅱ) complexes have been frequently used as electrophos -phorescent materials.2-Phenylpyridine and its derivatives are these complexes primary ligands.We have modified 2-phenylpyridine and synthesized their Iridium complexes.The electrophosphorescent devices with these Iridium complexes as the guest emitting materials have been fabricated and performances characterized.Europium complexes can emit highly monochromatic red light corresponding to f-f transitions。Europium tris(β-diketonate) complexes are finding innovative applications as the electroluminescent layer on account of its characteristic luminescence and electron transport.We modifiedβ-diketones via to incorporat triphenylamine group is thought to enhance the hole transport of the material,so this kind of Europium complexes has the character of bi-polar.Their photonic properities has been reseached and luminescence quantum efficiency were compared,the triphenylamine connecting with theβ-diketone made the absorbance of the compounds red shift,and improved the quantum of europium ternary complexes at 77K.The modified complexes have characteristic luminescence of Europium ion and blue luminescence of ligands,it suggest that multi-luminescence of unimolecule compound is viable indirectly.In addition,triphenylamine derivatives have extensively applications in photolectric material on account of its properties of hole transport.A series of triphenylamine derivatives were synthesized via Pd-catalyzed Suzuki-coupling reaction of triphenylamine boronic acid with aryl bromide.We have investigated the different influencing factors of Suzuki-coupling reaction,and summarized conformable condition of these reactions.Finally,using 4-nitroaniline as the stating materials,we have synthesized 4-(pyridin-2-yl)phenylboronic acid through a series of reactions such as Gomberg-Bachmann reaction,boronic acidification.Then two new ligands were synthesized via Suzuki-coupling reaction of triphenylamine boronic acid with 1-(4-bromophenyl) butane-1,3-dione and 1-(4-bromophenyl)-4-isobutyryl-3-methyl-1H-pyrazol-5(4H)-one.