Effect of dipole layer of Alq3 and metal on organic electroluminescence

摘要：

The effect of dipole layer of Alq3 and metal on organic electroluminescence in organic light-emitting diodes (OLEDs) was discussed.The relations among energy level alignment,interface charge transfer and dipole layer formation were well analyzed.An interface dipole layer and charge transfer were observed by XPS and UPS.As for Alq3 with metallic film such as Al and Mg,N 1s,O 1s and C 1s all move to low binding energy.Both Alq3/Al and Alq3/Mg have different electron spectrum from that of simple Alq3 film.It is really the reason of the interface energy change that the metal atoms located near the interface move to organic layer and then chemically interact with O and C of Alq3.The injection voltage barrier heights of electrons at Alq3/Al and Alq3/Mg interface are 0.1 eV and 0.2 eV,respectively.Charge transfer lowers electrons injection voltage barrier height and forms good electrons injection interfaces.The width of dipole layer is about 5 nm.The knowledge of such interface dipole layer is essential for a proper understanding of the physical processes at the metal/organic interface.

关键词： interface dipole layer organic electroluminescence charge transfer chemical reaction

作者: XU Xue-mei WU Jian-hao WANG Hua WU Cheng-de YE Jun-hua WU Ai-jun QU Shu PENG Jing-cui

作者单位: School of Physics Science and Technology,Central South University,Changsha 410083,China School of Physics and Microelectronics Technology,Hunan University,Changsha 410082,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）