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Blue luminescent compounds T1―T4 containing triphenylamine donors,bipyridine acceptors and olefinic linkers were synthesized and characterized by 1 H NMR,13 C 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(T g) exceeding 97 ℃ and the maximum T g 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).
Synthesis of T1-T4 containing triphenylamine donors, bipyridine acceptors and olefinic linkers were synthesized and characterized by1H 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 compounds T1-T4 have asymmetric linear structures and the proper highest percentage of 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 suggesting these 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 posse ss high glass-transition temperature (T g) exceeding 97 ° C. and the maximum T g is 155.28 ° C. 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).