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Citation: . Syntheses and Properties of Blue Phosphorescent Host Materials Based on Pyridine Ketone Derivatives[J]. Chemistry, ;2018, 81(6): 531-536. shu

Syntheses and Properties of Blue Phosphorescent Host Materials Based on Pyridine Ketone Derivatives

Received Date: 27 January 2018
Accepted Date: 7 April 2018

Figures(5)

Two blue phosphorescent host materials (2-bromo-5-phenoxazin-10-yl-phenyl)-pyridin-4-yl-methanone (BPPPM), [2-bromo-5-(9, 9-dimethyl-9H-acridin-10-yl)-phenyl]-pyridin-4-yl-methanone (BDPPM) based on 4-benzoylpyridine, phenoxazine and 9, 9-dimethylacridine were synthesized. The structures of BPPPM and BDPPM were characterized by ¹H NMR, ¹³C NMR and elemental analysis. The photophysical, electrochemical and thermal properties were investigated. The results showed that the optical bandgaps (E_g) of BPPPM and BDPPM are 3.31 and 2.64 eV, and their fluorescence emission peaks are deep blue fluorescence at 405nm and blue fluorescence at 435nm, respectively. Both BPPPM and BDPPM had high triplet energy levels (2.70, 2.65eV), which matches the triplet level of the blue phosphorescent guest material FIrpic (2.65eV). Both BPPPM and BDPPM have a very suitable HOMO (-5.45, -5.35eV) and LUMO level (-2.14, -2.82eV) with a small degree of spatial overlap between the HOMO and LUMO, so they have good bipolar properties. In addition, they all have good thermal stability and film-forming properties.
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