The Polymer Society of Korea

분자전자 부문위원회

포스터발표

Impedance Spectroscopic Analysis of Charge Generation Layer of Organic Light Emitting Diodes

()

The charge generation layer (CGL) is a key element for determining the lifetime and efficiency of tandem structured organic light-emitting diodes (OLEDs). In this research, we have studied the operating mechanism of an organic p-n heterojunction CGL consisting of ITO/2,2,2"-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole (TPBi) (70 nm)/TPBi:Rb₂CO₃ (20 wt%) (70 nm)/N,N'-Bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine (NPB):MoO₃ (20 wt%) (70 nm)/NPB (70 nm)/Al. To enhance the charge generation efficiency of the CGL device, 1,4,5,8,9,11-Hexaazatriphenylenehexacarbonitrile (HAT-CN) was inserted as interlayer (IL) between NPB:MoO₃ and TPBi:Rb₂CO₃ layers. It was shown that the CGL with IL had nearly three times higher current density than the reference CGL. After electrical aging, the CGL device with IL showed a lower turn-on voltage shift than that of the reference CGL and the capacitance-frequency analysis confirmed that the enhanced stability of CGL was due to the IL.

1PS-122

-