Synthesis and Properties of Novel Luminescent Compounds Containing Triphenylamine and Bipyridine Units

摘要

Blue luminescent compounds T1-T4 containing triphenylamine donors,bipyridine acceptors and olefinic linkers were synthesized and characterized by 1H NMR,13C NMR and high resolution mass spectrometry(HRMS).Four compounds T1-T4 exhibit excellent solubility in common solvents and good film forming properties.Quantum chemical calculations show that compounds T1-T4 have asymmetric linear structures and the proper highest occupied molecular orbital(HOMO)levels.The UV-Vis absorption and fluorescence emission spectra of the four compounds in dilute chloroform solutions and on the solid films were measured.It reveals that compounds T1-T4 exhibit similar spectral behavior,suggesting that these compounds can form amorphous state in solid films.The calculated absorption and emission spectra of compounds T1-T4 are in good agreement with experimentally determined ones.Compounds T1-T4 have absolute fluorescence quantum yield above 17％ in dilute chloroform solutions.Four compounds possess high glass-transition temperature(Tg)exceeding 97 ℃ and the maximum Tg is 155.28 ℃ for compound T3.Cyclic voltammetry measurements show that these compounds have proper HOMO levels in a range of-5.01—-5.13 eV for hole injection.The properties of compounds T1—T4 indicate that these compounds are candidates for the application in organic light-emitting devices(OLEDs)as hole-transporting materials(HTMs).