Yang Ji Seong, Choo Dong Chul, Kim Tae Whan, Jin You Young, Seo Ji Hyun, Kim Yong Kwan
Research Institute of Information Display, Department of Information Display Engineering, Hanyang University, Seoul 133-791, Korea.
J Nanosci Nanotechnol. 2010 May;10(5):3619-22. doi: 10.1166/jnn.2010.2275.
Enhancement mechanisms of the luminance efficiency in green organic light-emitting devices (OLEDs) fabricated utilizing a cesium fluoride (CsF)/fullerene (C60) heterostructure acting as an electron injection layer (EIL) were investigated. The luminance efficiencies as functions of the current density showed that the luminance efficiency in the green OLEDs fabricated utilizing a CsF/C60 heterostructure acting as an EIL was higher than that in the green OLEDs fabricated utilizing a CsF, a Liq, or a C60 single EIL. The interfacial dipole existing at the CsF layer decreased the electron injection barrier, and the stability of the OLEDs with a CsF EIL was enhanced due to the lower diffusion rate of Cs atoms in comparison with Li atoms. The enhancement of the luminance efficiency of the OLEDs with a heterostructure EIL was attributed to the increase in the electron injection. These results can help improve understanding of the enhancement mechanisms of the luminance efficiency in green OLEDs utilizing a CsF/C60 heterostructure acting as an EIL.
研究了利用氟化铯（CsF）/富勒烯（C60）异质结构作为电子注入层（EIL）制备的绿色有机发光器件（OLED）中发光效率的增强机制。作为电流密度函数的发光效率表明，利用CsF/C60异质结构作为EIL制备的绿色OLED中的发光效率高于利用CsF、Liq或C60单一EIL制备的绿色OLED中的发光效率。CsF层处存在的界面偶极降低了电子注入势垒，并且与Li原子相比，由于Cs原子的扩散速率较低，具有CsF EIL的OLED的稳定性得到增强。具有异质结构EIL的OLED发光效率的提高归因于电子注入的增加。这些结果有助于增进对利用CsF/C60异质结构作为EIL的绿色OLED中发光效率增强机制的理解。
