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Electroluminescence of an iridium complex phosphorescent material doped polymeric system

Tang Xiao-Qing Yu Jun-Sheng Li Lu Wang Jun Jiang Ya-Dong

Electroluminescence of an iridium complex phosphorescent material doped polymeric system

Tang Xiao-Qing, Yu Jun-Sheng, Li Lu, Wang Jun, Jiang Ya-Dong
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  • Abstract views:  3713
  • PDF Downloads:  1245
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  • Received Date:  24 January 2008
  • Accepted Date:  14 May 2008
  • Published Online:  05 May 2008

Electroluminescence of an iridium complex phosphorescent material doped polymeric system

  • 1. 电子科技大学光电信息学院,电子薄膜与集成器件国家重点实验室,成都 610054

Abstract: With a novel iridium complex (pbi)2Ir(acac) doped into carbazole copolymer, polymer doped electrophosphorescent organic light-emitting diodes with the structure of indium-tin oxide(ITO)/poly(N-vinylcarbazole) (PVK):(pbi)2Ir(acac) (x)/2,9-dimethyl-4,7-diphenyl-1,10-phenan throline (BCP) (20nm)/8-Hydroxyquinoline aluminum(Alq3) (10nm)/Mg:Ag were fabricated. The photoluminescent (PL) and electroluminescent (EL) characteristics of the polymer doped system were investigated at the low doping concentrations of 0.1% and 0.5%, respectively. The results demonstrate that the luminescent spectra with different intensities of PVK and (pbi)2Ir (acac) co-existed in the PL and EL spectra of blend system, which was ascribed to an incomplete energy transfer process and direct charge trapping in the electroluminescence process. The 0.1% (pbi)2Ir(acac) doped device achieved a white light emission with the commissions internationale de 1'eclairage (CIE) coordinates of (0.32, 0.38) when the bias voltage was 19V; the 0.5% (pbi)2Ir(acac) doped device had a maximum luminance of 11827 cd·m-2 and a maximum luminance efficiency of 4.13 cd·A-1 corresponding to a bias of 20.6V and 13.4V, respectively.

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