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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 1 s 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. 相似文献
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有机电致发光器件的效率取决于电子和空穴的有效注入和复合.电极材料和有机材料的稳定性以及电极/有机层之间的界面处的相互作用是制约有机电致发光器件寿命的主要因素. 相似文献
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LiF层对ITD/Alq3/LiF:Al器件性能的影响 总被引:1,自引:1,他引:0
分别制备了4种有机电致发光器件(OLEDs):ITO A1q^3/Al;ITO/A1q^3/LiF(1.0nm):A1;ITO/A1q^3/LiF(1.5nm):A1;ITO/A1q^3/LiF;(2.0nm)A1。研究了LiF的引入对金属电极与发光层界面的影响以及各种不同的界面态对器件发光性能的影响。研究结果表明:适当的LiF厚度的引入不仅可以改善器件的界面特性,而且可以提高器件的发光亮度及发光效率。 相似文献
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