Chin. Phys. Lett.  2007, Vol. 24 Issue (3): 828-830    DOI:
Original Articles |
Organic Light-Emitting Devices with a LiF Hole Blocking Layer
LIAN Jia-Rong;YUAN Yong-Bo;ZHOU Xiang
State Key Lab of Optoelectronic Materials and Technologies, Guangdong Province Key Lab of Display Material and Technology, Sun Yat-Sen University, Guangzhou 510275
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LIAN Jia-Rong, YUAN Yong-Bo, ZHOU Xiang 2007 Chin. Phys. Lett. 24 828-830
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Abstract We introduce a thin LiF layer into tris-8-hydroxyquinoline aluminium (Alq3) based bilayer organic light-emitting devices to block hole transport. By varying the thickness and position of this LiF layer in Alq3, we obtain an lectroluminescent efficiency increase by a factor of two with respect to the control devices without a LiF blocking layer. By using a 10nm dye doped Alq3 sensor layer, we prove that LiF can block holes and excitons effectively. Experimental results suggest that the thin LiF layer may be a good hole and exciton blocking layer.
Keywords: 78.60.Fi      85.60.Jb     
Received: 28 November 2006      Published: 08 February 2007
PACS:  78.60.Fi (Electroluminescence)  
  85.60.Jb (Light-emitting devices)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2007/V24/I3/0828
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LIAN Jia-Rong
YUAN Yong-Bo
ZHOU Xiang
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