Abstract
The effect of TiO2 nanoparticle (NP) content on the improvement of poly(9,9′-di-n-octylfluorenyl-2,7-diyl) (PFO)/Fluorol 7GA organic light emitting diode (OLED) performance is demonstrated here. The PFO/Fluorol 7GA blend with specific ratios of TiO2 NPs was prepared via a solution blending method before being spin-coated onto an indium tin oxide (ITO) substrate to act as an emissive layer in OLEDs. A thin aluminum layer as top electrode was deposited onto the emissive layer using the electron beam chamber. Improvement electron injection from the cathode was achieved upon incorporation of TiO2 NPs into the PFO/Fluorol 7GA blend, thus producing devices with intense luminance and lower turn-on voltage. The ITO/(PFO/Fluorol 7GA/TiO2)/Al OLED device exhibited maximum electroluminescence intensity and luminance at 25 wt % of TiO2 NPs, while maximum luminance efficiency was achieved with 15 wt % TiO2 NP content. In addition, this work proved that the performance of the devices was strongly affected by the surface morphology, which in turn depended on the TiO2 NP content.
Highlights
Despite recent advancement, conjugated polymers, which are well known as active materials in various photovoltaic [1,2] and electroluminescence [3,4,5] devices, continue to inherit two major problems, namely poor stability and low luminance efficiency [6,7]
Previous works have successfully demonstrated the additions of the TiO2 NPs in conjugated polymers, namely the poly(9,9-di-n-octylfluorenyl-2,7-diyl)
In donor/acceptor addition, the blending approach commonly resulted in the formation of non-luminescent fluorophores in the solid donor/acceptor blending approach commonly resulted in the formation of non-luminescent state form, even though they are highly emissive in solution
Summary
Despite recent advancement, conjugated polymers, which are well known as active materials in various photovoltaic [1,2] and electroluminescence [3,4,5] devices, continue to inherit two major problems, namely poor stability and low luminance efficiency [6,7]. Previous works have successfully demonstrated the additions of the TiO2 NPs in conjugated polymers, namely the poly(9,9-di-n-octylfluorenyl-2,7-diyl). Energy levels [16], enhancement in the luminance and reduction in turn-on voltage were recorded These improvements were hindered the formation excimer. In donor/acceptor addition, the blending approach commonly resulted in the formation of non-luminescent fluorophores in the solid donor/acceptor blending approach commonly resulted in the formation of non-luminescent state form, even though they are highly emissive in solution. The additions of TiO2 NPs into a PFO/Fluorol 7GA method to improve the performance of the PFO-based. 2 2 NP content method to improve the performance of the PFO-based OLED device.
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