Effect of interlayer on phosphorescent white organic light-emitting diodes

被引：0
|
作者：
Zhu, Ying-Guang [1 ,2 ]
Liang, Chun-Jun [1 ]
Liu, Shu [2 ]
Liu, Shu-Jie [2 ]
He, Zhi-Qun [1 ]
机构：
[1] Institute of Optoelectronic Technology, Key Laboratory for Information Storage, Dispalys and Materials, Beijing Jiaotong University
[2] National Lighting Test Centre
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2014年 / 35卷 / 07期
关键词：
Efficiency; Energy transfer; Interlayer; Two-band; White OLED;
D O I：
10.3788/fgxb20143507.0824
中图分类号：
学科分类号：
摘要：
Phosphorescent white organic light-emitting diodes with double light-emitting layers were fabricated based on phosphorescent blue emittor bis[3, 5-difluoro-2-(2-pridyl)phenyl-(2-earboxypyribyl)iridumIII] (FIrpic) and red emittor bis(2-methyldibenzo[f, h]quinoxaline)(acetylacetonate) iridium(III)(Ir(MDQ)2acac). FIrpic was doped in an ultra wide band-gap host 1, 3-bis(triphenylsilyl)benzene (UGH3), and Ir(MDQ)2acac was doped in the host 4, 4', 4″-tris(carbazol-9-yl)triphenylamine(TCTA). A hole transporting wide-band-gap material 1, 3-bis(carbazol-9-yl)benzene (mCP) was introduced between the emitting layers. The device structure was ITO/NPB(40 nm)/TCTA:Ir(MDQ)2acac 7%(10 nm)/mCP(x nm)/UGH3:Firpic 8%(30 nm)/BPhen(30 nm)/LiF(0.8 nm)/Al(200 nm). The results show that the interlayer plays an important role of balancing charge carriers, and blocking energy transfer between the emitting layers. With an appropriate thickness of the interlayer, the device performances can be significantly enhanced. Compared with the device without interlayer, the maximum current efficiency can be enhanced from 3.4 cd/A to 13.2 cd/A.
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页码：824 / 829
页数：5
相关论文
共 23 条
  • [1] Kido J., Kimura M., Nagai K., Multilayer white light-emitting organic electroluminescent device, Science, 267, pp. 1332-1334, (1995)
  • [2] Hsiao C.H., Lan Y.H., Lee P.Y., Et al., White organic light-emitting devices with ultra-high color stability over wide luminance range, Org. Electron., 12, pp. 547-555, (2011)
  • [3] Zhang S.M., Chen Y., Wang X.H., Et al., White organic light-emitting diodes with high color rendering index using phosphorescent sensitizer and blue fluorescent emitter, Chin. J. Lumin., 33, 1, pp. 97-101, (2012)
  • [4] Reineke S., Linder F., Schwartz G., Et al., White organic light-emitting diodes with fluorescent tube efficiency, Nature, 459, 7244, pp. 234-238, (2009)
  • [5] Liu S.Q., Yu J.S., Highly efficient white organic light-emitting devices consisting of undopedultrathin yellow phosphorescent layer, J. Lumin., 134, pp. 665-669, (2013)
  • [6] Zhou Z., Wang F.C., Liu S.Q., Et al., High efficient phosphor-converted white organic light-emitting diodes with red Sr<sub>2</sub> Si<sub>5</sub> N<sub>8</sub>:Eu<sup>2+</sup> color conversion layer, Chin. J. Lumin., 33, 2, pp. 176-181, (2012)
  • [7] Kim N.H., Kim Y.H., Yoon J.A., Et al., Color optimization of single emissive white OLEDs via energy transfer between RGB fluorescent dopants, J. Lumin., 143, pp. 723-728, (2013)
  • [8] Liao T.C., Chou H.T., Enhance efficiency of blue and white organic light emitting diodes with mixed host emitting layer using TCTA and 3TPYMB, Curr. Appl. Phys., 13, pp. 152-155, (2013)
  • [9] Wang Z., Chen S.W., Zhou X., Study on efficient blue and white organic light-emitting devices, Chin. J. Lumin., 32, 7, pp. 715-719, (2011)
  • [10] Ma Y., Han W., Zhang F.H., Et al., White organic light-emitting diodes based on mixed doping emitting layer, Chin. J. Liq. Cryst. Disp., 26, 1, pp. 40-43, (2011)
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