Electroluminescence performances of 1,1-bis(4-(N,N-dimethylamino)phenyl)-2,3,4,5-tetraphenylsilole based polymers in three cathode architectures

查看全文 作　　者：LIU [1,2]ZhiTian;HU [1]SuJun;ZHANG [2]LinHua;CHEN [1]JunWu;PENG [1]JunBiao;CAO [1]Yong

机构地区：[1]State Key Laboratory of Luminescent Materials & Devices,South China University of Technology;[2]School of Materials Science & Engineering,Wuhan Institute of Technology

出　　处：《Science China Chemistry》索引2013年第56卷第8期,共8页

基　　金：supported by the National Natural Science Foundation of China (21225418,51003080);the National Basic Research Program of China (2013CB834705);the Youth Science Plan for Light of the Morning Sun of Wuhan City (201271031385);State Key Laboratory of Luminescent Materials and Devices (2012-09);Natural Science Foundation of Hubei Province (2012FFB04705) 摘　　要：A new silole monomer with two 4-(N,N-dimethylamino)phenyl substitutions on silicon atom as designed and synthesized.Three copolymers PF-N-HPS1,PF-N-HPS10 and PF-N-HPS20 were then obtained by copolymerizations of 2,7-fluorene derivatives with the silole monomer at feed ratios of 1%,10%,and 20%.Their UV-vis absorption,electrochemical,photoluminescent,and electroluminescent (EL) properties were investigated.PF-N-HPS possessed HOMO levels of 5.25-5.58 eV,and showed green emissions.Using PF-N-HPS as the emissive layer,three different polymer light-emitting diodes were fabricated as device A with ITO/PEDOT/PF-N-HPS/Al,device B with ITO/PEDOT/PF-N-HPS/Ba/Al,and device C with ITO/PEDOT/PF-N-HPS/TPBI/Ba/Al.For the device A,PF-N-HPS only showed very low EL efficiency of 0.06-0.33 cd/A,indicating that the Al cathode could not inject electron efficiently to the emissive polymers containing the 4-(N,N-dimethylamino)phenyl groups.For the device B,low work function Ba supplied better electron injections,and the EL efficiency could be improved to 0.85-1.44 cd/A.TPBI with a deep HOMO level of 6.2 eV could enhance electron transport and hole blocking.Thus modified recombinations and largely elevated EL efficiency of 4.56-7.96 cd/A were achieved for the device C.The separation of the emissive layer and metal cathode with the TPBI layer may also suppress exciton quenching at the cathode interface. 关键词：聚合物发光二极管电致发光性能阴极结构苯基取代二甲氨基二甲基 HOMO能级设备制造

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Electroluminescence performances of 1,1-bis(4-(N,N-dimethylamino)phenyl)-2,3,4,5-tetraphenylsilole based polymers in three cathode architectures

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