Abstract
The influence of SiO2/TiO2 nanocomposites on the performance of organic light-emitting diodes (OLEDs) based on poly(9,9′-di-n-octylfluorenyl-2,7-diyl) (PFO) and various amounts of poly(2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene-vinylene) (MEH-PPV) was investigated. Prior to the fabrication of the OLEDs on indium-tin oxide (ITO) substrates, the hybrids of PFO/MEH-PPV, in the presence and absence of the SiO2/TiO2 nanocomposites, were prepared via the solution blending technique. Improvement of the performances of the devices in the presence of the SiO2/TiO2 nanocomposites was detected. The existence of the SiO2/TiO2 nanocomposites led to better charge carrier injection and, thus, a significant reduction in the turn-on voltage of the devices. The enhancement of MEH-PPV electroluminescence peaks in the hybrids in the presence of SiO2/TiO2 nanocomposites is not only a result of the Förster resonance energy transfer, but also of hole-electron recombination, which is of greater significance. Moreover, the existence of the SiO2/TiO2 nanocomposites led to a shift of the CIE chromaticity coordinates of the devices.
Highlights
There are many advantages that make conjugated polymers attractive as emissive materials in organic light-emitting diode (OLED) devices
OLEDs based on hybrids of poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO), which acts as a donor material and has a relatively large band gap, and poly(2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene-vinylene) (MEH-polyphenylene vinylene (PPV)), acting as an acceptor material, have attracted research attention [20,21]
By combining two conjugated polymers with contrasting electrical properties, OLEDs based on hybrids of conjugated polymers, as emissive layers, offer numerous advantageous features compared to single component layers, with luminance efficiency being improved by balancing electron and hole injection [22,23]
Summary
There are many advantages that make conjugated polymers attractive as emissive materials in organic light-emitting diode (OLED) devices Examples of these advantages are low operating voltage, low cost of fabrication, ease of processing and manufacturing, flexibility, capability to build devices with large-area and good solubility in common organic solvents and photothermal stability [1,2,3,4]. By combining two conjugated polymers with contrasting electrical properties, OLEDs based on hybrids of conjugated polymers, as emissive layers, offer numerous advantageous features compared to single component layers, with luminance efficiency being improved by balancing electron and hole injection [22,23].
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