Tuning the Optical Properties of MEH–PPV/PFO Hybrid Thin Films via the Incorporation of CsPbBr3 Quantum Dots

Coatings

SaifM. H. Qaid¹  BandarAli Al-Asbahi¹  HamidM. Ghaithan¹  AbdullahS. Aldwayyan¹ 

[1] Physics and Astronomy Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;

关键词: CsPbBr₃ perovskite quantum dots;    MEH–PPV/PFO conjugated polymers;    composite;    light-emitting materials;    tunable bandgap;   

DOI  :  10.3390/coatings11020154

来源: DOAJ

【 摘 要 】

The current work examines the effects of cesium lead bromide (CsPbBr₃) perovskite quantum dots (PQDs) on the structural and optical properties of conjugated polymer blends of poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene] (MEH–PPV) and poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO). MEH–PPV/PFO composite thin‑films containing PQDs with weight ratios between 0.5 wt.% and 10 wt.% were prepared via a solution-blending method prior to spin-coating on glass substrates. The MEH–PPV/PFO composites’ crystallinity was improved, and the roughness was dramatically increased with higher PQDs content, as confirmed by X-ray diffraction (XRD) and atomic force microscopy (AFM), respectively. Conversely, a higher PQDs content resulted in a gradual reduction of the Urbach tail and an increase in the steepness parameter, thereby reducing the localized density of the electronic states within the forbidden bandgap of the hybrids. Moreover, a slight reduction in the direct and indirect bandgaps was found in PQDs/(MEH–PPV/PFO) composite films containing a higher PQDs content and provided evidence of the low concentration of the localized states. The incorporation of the PQDs resulted in enhanced non-radiative energy transfer processes in the MEH–PPV/PFO hybrids, which are very important for the development of optimized optoelectronic devices.

【 授权许可】

Unknown