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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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Keywords:
- phosphorescence /
- exciton blocking /
- white organic electroluminescent
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物理学报. 2008, 57(3): 1913-1917.
doi: 10.7498/aps.57.1913.
同时掺杂磷光和荧光染料的白色有机电致发光器件性能研究
- 收稿日期: 2007-07-02
- 修回日期: 2007-07-24
- 刊出日期: 2008-03-20
English Abstract
A novel white organic electroluminescent device with both phosphorescent and fluorescent dopants
- Received Date:
02 July 2007
- Accepted Date:
24 July 2007
- Published Online:
20 March 2008
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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