Green-synthesized,low-cost tetracyanodiazafluorene(TCAF) as electron injection material for organic light-emitting diodes  

作　　者：Bing Yang Jianfeng Zhao Zepeng Wang Zhenlin Yang Zongqiong Lin Yanni Zhang Jiewei Li Linghai Xie Zhongfu An Hongmei Zhang Jiena Weng Wei Huang 

机构地区：[1]Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing Tech University(Nanjing Tech),Nanjing 211816,China [2]Key Laboratory for Organic Electronics&Information Displays(KLOEID)and Institute of Advanced Materials,Nanjing University of Posts&Telecommunications,Nanjing 210023,China [3]Shaanxi Institute of Flexible Electronics(SIFE),Northwestern Polytechnical University(NPU),Xi'an 710072,China

出　　处：《Chinese Chemical Letters》2019年第11期1969-1973,共5页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21975126,51673095,21875104,21875191,21603104);the Natural Science Foundation of Jiangsu Province(Nos.BK20171470,BK20160991,BK20150064,BK20130912);973 Program(No.2015CB932200);Ministry of Education and Synergetic Innovation Center for Organic Electronics and Information Displays for financial support

摘　　要：Two electron-deficient azaacenes including di-and tetra-cyanodiazafluorene(DCAF and TCAF)with the advantages of deep lowest unoccupied molecular orbital(LUMO),green-synthesis,low-cost,simply purification method,excellent yields have been obtained,characterized and used as electron injection materials(EIMs)in three groups of electroluminescence devices.Device B with TCAF as EIM exhibited the best performance including turn-on voltage of 5.0 V,stronger maximum luminance intensity of 31,549 cd/m2,higher luminance efficiency of 62.34 cd/A and larger power efficiency of 21.74 lm/W which are 0.53,6.7,9.3 and 15.3 times than that of device A with DCAF as EIMs,respectively.The enhanced interfacial electron injection ability of TCAF than that of DCAF is supported by its better electron mobility in electron-only device,deeper LUMO(-4.52 eV),and stronger electronic affinity.Best external quantum efficiency of 16.56%was achieved with optimized thicknesses of TCAF as EIM and TPBi as electron transporting layer.As a new comer of acceptor family,TCAF would push forward organic electronics with more fascinating and significant applications.Two electron-deficient azaacenes including di-and tetra-cyanodiazafluorene(DCAF and TCAF) with the advantages of deep lowest unoccupied molecular orbital(LUMO),green-synthesis,low-cost,simply purification method,excellent yields have been obtained,characterized and used as electron injection materials(EIMs) in three groups of electroluminescence devices.Device B with TCAF as EIM exhibited the best performance including turn-on voltage of 5.0 V,stronger maximum luminance intensity of31,549 cd/m^2,higher luminance efficiency of 62.34 cd/A and larger power efficiency of 21.74 lm/W which are 0.53,6.7,9.3 and 15.3 times than that of device A with DCAF as EIMs,respectively.The enhanced interfacial electron injection ability of TCAF than that of DCAF is supported by its better electron mobility in electron-only device,deeper LUMO(-4.52 eV),and stronger electronic affinity.Best external quantum efficiency of 16.56% was achieved with optimized thicknesses of TCAF as EIM and TPBi as electron transporting layer.As a new comer of acceptor family,TCAF would push forward organic electronics with more fascinating and significant applications.

关 键 词：Green-synthesis ACCEPTOR Tetracyanodiazafluorene(TCAF) Electron-injection material Organic light-emitting diode 

分 类 号：TN3[电子电信—物理电子学]