Abstract
The effect of TiO2 nanoparticles on the photophysical properties of ternary conjugated polymer (CP) blends of poly(9,9-dioctylfluorene-2,7-diyl) (PFO), poly 9,9-dioctylfluorene-alt-benzothiadiazole (F8BT) and poly(2-methoxy-5(2-ethylhexyl)-1,4 -phenylenevinylene (MEH-PPV) thin films was investigated. This ternary blend used a fixed amount of PFO as the donor with MEH-PPV and F8BT in various ratios as the acceptors. The solution-blending method and the spin-coating technique were used to prepare the blends and the thin films, respectively. Through efficient Förster Resonance Energy Transfer (FRET), the desired white emission was achieved with PFO/0.3 wt.% F8BT/0.5 wt.% MEH-PPV ternary blend thin film. Additions of nanoparticles up to 10 wt.% dramatically intensified the white emission which then dimmed at higher contents due to agglomerations. The current density–voltage characteristics of the nanocomposite thin films exhibited dependency on the content and distributions of the nanoparticles. Finally, a possible underlying mechanism for the intensification of emission is proposed.
Highlights
Advancements in material engineering and fabrication technologies have enabled giant electronics companies to offer high-quality organic light emitting diodes (OLEDs) screens for various applications such as in televisions and phones
There is a significant overlap between the emission spectrum of PFO and absorption spectrum of MEH-PPV, indicating the potential Förster Resonance Energy Transfer (FRET) mechanism in the blend
Actual manifestation of FRET was observed in the emission spectra of the blended binary polymer thin films (Figure 1b)
Summary
Advancements in material engineering and fabrication technologies have enabled giant electronics companies to offer high-quality organic light emitting diodes (OLEDs) screens for various applications such as in televisions and phones. Success in the production of high-quality displays is a reward of relentless effort in the investigation of conjugated polymers (CPs). This is because, CPs have several advantages such as better emission tunability, low cost and simple fabrication [1,2]. A full-color emitter for white OLEDs (WOLEDs) can be achieved by blending different CPs that emit lights covering the entire visible spectrum.
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