TY - JOUR
AU1 - Gao, Jia
AU2 - You, Han
AU3 - Qin, Zhi-Pei
AU4 - Fang, Junfeng
AU5 - Ma, Dongge
AU6 - Zhu, Xuhui
AU7 - Huang, Wei
AB - We demonstrate high efficiency polymer electrophosphorescent light-emitting diodes based on a new iridium complex tris{diphenyl-(4-pyridin-2-yl-phenyl)-amine}iridium (III) (Ir(dpppa)3) doped into a poly (N-vinyl carbazole) (PVK) host. Electron transporting 1,3,5-tris(2-N-phenylbenzimidazolyl) benzene (TPBI) and hole transporting N,N-bis-(1-naphthyl)-N,N-diphenyl-1,1-biphenyl-4, 4-diamine (NPB) were doped simultaneously into the host to improve the transport balance of the charge carriers and avoid the accumulation of the space charges caused by unbalanced charge transport and direct carrier trapping on Ir(dpppa)3. The effect of the TPBI and NPB concentrations was examined. By optimizing the concentrations of the TPBI and NPB in the blend, the device showed a current efficiency as high as 25.2 cd A1 at a current density of 0.85 mA cm2.
TI - High efficiency polymer electrophosphorescent light-emitting diodes
JF - Semiconductor Science and Technology
DO - 10.1088/0268-1242/20/8/029
DA - 2005-08-01
UR - https://www.deepdyve.com/lp/iop-publishing/high-efficiency-polymer-electrophosphorescent-light-emitting-diodes-KuRA9I2u3v
SP - 805
VL - 20
IS - 8
DP - DeepDyve
ER -