Abstract
In this paper, we review the emission characteristics from organic light-emitting diodes (OLEDs) and organic molecular thin films with planar and corrugated structures. In a planar thin film structure, light emission from OLEDs was strongly influenced by the interference effect. With suitable design of microcavity structure and layer thicknesses adjustment, optical characteristics can be engineered to achieve high optical intensity, suitable emission wavelength, and broad viewing angles. To increase the extraction efficiency from OLEDs and organic thin-films, corrugated structure with micro- and nano-scale were applied. Microstructures can effectively redirects the waveguiding light in the substrate outside the device. For nanostructures, it is also possible to couple out the organic and plasmonic modes, not only the substrate mode.
Highlights
Organic materials have attracted much attention for applications in electronic and optoelectronic devices, such as organic transistors, organic solar cells and organic light-emitting devices [1,2,3,4]
Part of the photons propagate toward the hole-transporting layer (HTL), indium tin oxide (ITO), glass substrate and out of the device and part of them propagate toward the metal cathode and reflect back [25]
This value is higher than that calculated from classical optics, it reveals that the light extraction from the device is one of the important bottlenecks for organic light-emitting diodes (OLEDs) efficiency
Summary
Organic materials have attracted much attention for applications in electronic and optoelectronic devices, such as organic transistors, organic solar cells and organic light-emitting devices [1,2,3,4]. For OLED technology, the fabrication conditions are similar to those of LCDs. That is, the device is fabricated on a huge glass substrate as a flat panel display, and can be regarded as a planar light-source [9].
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