1 School of Chemistry, Biology and Materials Engineering, Suzhou University of Science and Technology, Suzhou 215009 2 Jiangsu Key Laboratory of Environmental Functional Materials, Suzhou 215009
Abstract: Two star bipolar blue phosphorescent host materials with triphenyl-1,3,5-s-triazine as the core were designed and synthesized: ((6-(3-(9-ethyl-9H-carbazol-3-yl)phenyl)-1,3,5-triazine-2,4-diyl)bis(3-phenyl)) bis(diphenylpho-sphine oxide) (CzPTBPO) and (3-(4,6-bis(3-(9-ethyl-9H-carbazol-3-yl)phenyl)-1,3,5-triazin-2-yl)phenyl)di-phenyl-phosphine oxide(BCzPTPO). The fluorescence emission peaks of CzPTBPO and BCzPTPO are located at 410 nm and 424 nm, respectively, which are dark blue fluorescence. As calculated from the first emission peak of low-temperature phosphorescence, the triplet level (ET) is 2.75 eV and 2.68 eV, which matched with the energy level of blue phosphorescent guest material FIrpic (2.65 eV). The HOMO levels are calculated to be -5.68 eV and -5.62 eV, respectively, which match the function of the anode ITO (-4.5—-5.0 eV), and the LUMO levels are -2.42 eV and -2.44 eV, respectively. It can be matched with most electron transport materials (such as TPBi is -2.70 eV), indicating that they have good bipolar properties of hole injection and electron transport. TG shows that the decomposition temperature (5% mass loss) is 398 ℃ and 387 ℃, respectively, indicating that the thermal stability is very good. DSC shows that the glass transition temperature is 148 ℃ and 134 ℃, respectively, indicating that it has an amorphous structure and good film-forming performance. Therefore, CzPTBPO and BCzPTPO are expected to be used as a bipolar blue phosphorescent host material in PhOLEDs.
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2019, Vol. 33 
