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A novel white organic electroluminescent device with both phosphorescent and fluorescent dopants

Zhang Li-Juan Hua Yu-Lin Wu Xiao-Ming Zhang Guo-Hui Wang Yu Yin Shou-Gen

A novel white organic electroluminescent device with both phosphorescent and fluorescent dopants

Zhang Li-Juan, Hua Yu-Lin, Wu Xiao-Ming, Zhang Guo-Hui, Wang Yu, Yin Shou-Gen
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  • Abstract views:  3685
  • PDF Downloads:  1078
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Publishing process
  • Received Date:  02 July 2007
  • Accepted Date:  24 July 2007
  • Published Online:  20 March 2008

A novel white organic electroluminescent device with both phosphorescent and fluorescent dopants

  • 1. 天津理工大学材料物理研究所,天津 300384;天津市光电显示材料与器件重点试验室,天津 300384;显示材料与光电器件教育部重点实验室,天津 300384

Abstract: A double-layer white organic electroluminescent device was fabricated by using hole transporting material NPB doped with phosphoresecent dye Ir(piq)2(acac) as red emitting layer and CBP doped with fluorescent dye TBPe as blue emitting layer. The configuration of this device was ITO/NPB/NPB:Ir(piq)2(acac)/CBP/CBP:TBPe/BCP/Alq3/Mg:Ag/Ag in which Alq3,NPB(undoped),CBP(undoped) and BCP films functioned as electron transporting layer,hole transporting layer and exciton blocking layer,respectively. White emission was be successfully achieved from the device with good EL performance by adjusting the thicknessess of light-emitting layers and the proportion of the dopants (TBPe,Ir(piq)2(acac)). With a low turn-on voltage of 4.8V,it shows a maximum luminance of 7500cd/m2 and external quantum efficiency of 1.24% at the driving voltage of 9V. Pure white light with Commission Internationale de l'Eclairage (CIE) coordinates of(0.33 0.30)was obtained at an applied voltage of 15V.

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