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Isophorone derivative as red dopant for organic electroluminescent devices
Huiying Fu,Huanrong Wu,Xiaoyuan Hou,Fei Xiao,Bingxian Shao 한국물리학회 2007 Current Applied Physics Vol.7 No.6
The donoracceptor functionalized molecule, bis(4-(2-(3,3-dicyanomethylene-5,5-dimethyl-1-cyclohexylidene)vinyl)phenyl)(1-naph-thyl)amine (DPN-4CN), with symmetrical structure, was investigated for its application in optoelectronic devices. Red organic light-emitting diodes (OLEDs) were fabricated by doping DPN-4CN in tris(8-hydroxyquinolino) aluminum (Alq3) as red emitters, with astructure of ITO/NPB/Alq3:DPN-4CN/BCP/Alq3/LiF/Al. The device with a doping concentration of 2.5 wt% showed pure red emissionwithkmax . 2 at a driving voltage of 12 V, a current eciencyof 2.14 cd A. 1 and an external quantum eciency of 1.07% at a current density of 20 mA cm. 2. The current eciencies and CIE coor-dinates of the device were almost constant over a current density from 1 to 200 mA cm. 2.