Synthesis and Characterization of 9,10-Diphenylanthracene-Based Blue Light Emitting Materials

Abstract

A new series of conjugated polymers having diphenylanthracene vinylene biphenylene and diphenylanthracene vinylene terphenylene in the main chain and fluorene pendant group, were synthesized by nickel catalized Yamamoto coupling and palladium catalized Suzuki coupling. The obtained polymers showed good solubility in the common organic solvent and number average molecular weights of 14,000-9500 with a polydispersity indexes ranging from 1.7 to 2.1. Both polymers possess excellent thermal stability with glass transition temperatures of 123-127 degrees C and the onset decomposition temperatures of 420-400 degrees C. The obtained polymers showed blue emission (lambda(max) = 461 for PFPA and lambda(max) = 455 nm for PFPAME) in PL spectra, specially, PFPAME containing diphenylanthracene vinylene terphenylenevinylene showed the consistent emission in the solution and film. The double-layered device with an ITO/PEDOT/PFPAME/LiF/Al structure has a turn-on voltage of about 5.8 V, maximum brightness of 152 cd/m(2) and an electroluminescent efficiency of 0.143 lm/W, and stable blue EL emission that is not altered by increased voltage. (c) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5908-5916, 2009