Synthesis And Characterization Of Multi-branch Molecule Structure Based On Anthracene

Organic Light-Emitting Diode?OLEDs?have great potential applications in full-color displays and solid-state lighting due to the characteristics of low driving voltage,high luminescence,wide view angle,flexible substrates,fast response and so on.In order to obtain novel emitting materials with an improved thermal stability,high luminescence efficiency,we designed and synthesized four molecules based on anthracene dendrimers,and the target compounds had have been verified and characterized by ¹H NMR,MALDI-TOF mass spectrometry and so on.The thermal and electro-optical properties of these materials had have been evaluated by using thermal gravimetric analysis?TGA?,electrochemical cyclic voltammetry?CV?,ultraviolet-visible?UV-Vis?and photoluminescence?PL?spectroscoy.The energy band gaps?Eg?of the four target compounds?T₁,T₂,T₃,T₄?are same,all of them are the same value 3.1eV.The highest occupied molecular orbital?HOMO?energy levels of them are-5.56eV,-5.46eV,-5.46eV,-5.41eV,respectively.The fluorescence quantum yield???of T_1,T_2,T_3,T₄,which were calculated based on comparative method,where,quinine sulfate was employed as the standard,were 17.5%,7.5%,36.2%,14.8%,respectively??ex=367?.The?of the three-arm target product?T₃,T₄?increase significantly,compared with the six-arm target ones?T₁,T₂?.In our opinion,the cause of the phenonmenon maybe lie in the possibility of that three-arm target products,which has less anthracene units linked to CP core,have better planarity than six-arm product,which has more anthracene units linked to the CP core.The planarity will affect the luminescence behavior strongly.Normally,the better planarity will result in higher luminescence.All new compounds display excellent thermal properties,decomposition temperatures in nitrogen were in excess of 440?.In conclusion,in the point of view of comprehensive performance,T₁ and T₃ have the potential application in the field of bule OLED.