Abstract
Surface morphology and thermal stability of Cu-phthalocyanine (CuPc) films grown on an epitaxially grown MgO(001) layer were investigated by using atomic force microscope and X-ray diffractometer. The (002) textured β phase of CuPc films were prepared at room temperature beyond the epitaxial MgO/Fe/MgO(001) buffer layer by the vacuum deposition technique. The CuPc structure remained stable even after post-annealing at 350°C for 1 h under vacuum, which is an important advantage of device fabrication. In order to improve the device performance, we investigated also current-voltage-luminescence characteristics for the new top-emitting organic light-emitting diodes with different thicknesses of CuPc layer.
Highlights
For charge injection into organic semiconductor (OSC) devices, oxide materials have been widely utilized
Indium thin oxide (ITO) is used as a transparent conducting electrode for optoelectronic devices which enable light to be emitted from the bottom of the structure
Considering the monolithic integration of an organic light-emitting diode (OLED) on silicon or organic thin film transistors as well as spin valves, a thin epitaxial MgO(001) layer as the charge generation layer (CGL) in OLEDs might be interesting to investigate for magnetooptoelectronic applications
Summary
For charge injection into organic semiconductor (OSC) devices, oxide materials have been widely utilized. The work functions and electronic properties of ITO surfaces and, the interface electronic properties of contacts to OSC have become important issues to improve the organic light-emitting diode (OLED) device performance [1]. Different chemical and physical treatments have been investigated to control the work function of an anode ITO electrode. In order to control efficiently the charge injection and transport in OSC devices, a novel approach by introducing a thin oxide layer between an anode and a hole-transport layer (HTL) in organic light-emitting diodes (OLEDs) has Considering the monolithic integration of an OLED on silicon or organic thin film transistors as well as spin valves, a thin epitaxial MgO(001) layer as the CGL in OLEDs might be interesting to investigate for magnetooptoelectronic applications. According to our knowledge, up to Normalized Intensity CuPC(002) Cu K- Si(002) MgO(002) Cu K- Si(004) Fe(002)
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