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Microwave-assisted synthesis of FexZn1?xO nanoparticles for use in MEH-PPV nanocomposites and their application in polymer light-emitting diodes
摘要： A one-step microwave-assisted polyol method was used to fabricate FexZn1?xO (x = 0.01, 0.05, 0.10) nanoparticles. Zinc acetate dihydrate, iron (III) acetylacetonate, oleic acid and diethylene glycol were placed in a Teflon-lined reaction vessel. The reaction mixture was heated up to 250 °C for 15 min in a microwave reactor. The surface modification with oleic acid prevented agglomeration of the nanoparticles. The X-ray diffraction analysis revealed characteristics wurtzite hexagonal structure of ZnO and successful incorporation of the Fe dopant into the host crystal lattice. Doping of ZnO by Fe led to bandgap modification as estimated by Tauc plot. The as-prepared nanopowders were dispersed in toluene and mixed with a poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) polymer to make stable homogenous dispersions. Then, the FexZn1?xO/MEH-PPV nanocomposite thin films were prepared by spin coating and used as thin active layers in polymer light-emitting diodes. The thickness of deposited FexZn1?xO/MEH-PPV film was ca. 30 nm and that of reference neat MEH-PPV film was ca. 25 nm. The electroluminescent spectroscopy study showed that direct blending of MEH-PPV with Fe-doped ZnO nanoparticles is a simple and effective approach to significantly increase the luminance intensity of the diode in comparison to the diode fabricated by neat MEH-PPV.
关键词： Polymer light-emitting diodes,FexZn1?xO nanoparticles,Microwave-assisted synthesis,MEH-PPV nanocomposites
更新于2025-10-22 19:40:53
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Microwave-assisted particle size-controlled synthesis of ZnO nanoparticles and its application in fabrication of PLED device
摘要： ZnO nanoparticles were synthesised in diethylene glycol (DEG) with different ZnO molar precursor concentration (1 mmol, 2 mmol, 4 mmol and 8 mmol) in a microwave reactor for 15 minutes up to 250 °C. Zinc acetate dihydrate was used as the precursor for ZnO nanoparticles and oleic acid as a capping agent. It was found that different mmol precursor concentration yielded in different nanoparticle sizes. The crystallinity and particle size was analysed by XRD and the optical properties of the nanoparticles were studied by UV-Vis and PL. Oleic acid forms a layer around the ZnO nanoparticle surface. This layer helps in preparing nanocomposite solution by dispersing the ZnO nanoparticles in MEH-PPV solution. Further, the nanocomposite solution is deposited as a thin-film by spin-coating and this forms the emissive layer of the fabricated PLED device. The diode characteristics were analysed by studying the I-V and EL graphs.
关键词： PLED device,ZnO nanoparticles,MEH-PPV,microwave-assisted synthesis,optoelectronic properties
更新于2025-09-23 15:19:57
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Hybrid Color-Tunable Polymer Light-Emitting Diodes Using Electrospraying
摘要： This paper proposes a new paradigm in polymer light-emitting diode (PLED) fabrication by using a uniform electrosprayed microparticle film as the active layer. Among the seven electrospraying parameters analyzed, three crucial parameters are statistically identified and optimized to obtain thin electrosprayed microparticle layers. Using optimized electrospraying conditions, single-color red-emitting PLED (MEH-PPV) with a peak current density of 16.1 mA/mm2 under a 13.5 V bias and a peak external quantum efficiency of 3.2% are successfully fabricated. Finally, a combinatorial approach is implemented using both MEH-PPV (red-emitting) and F8BT (green-emitting) polymer microparticles at different mixing ratios to tune the emission spectrum of the devices. As such, it has been demonstrated that hybrid multilayer films using different organic materials with nonorthogonal solvents can be produced using this new approach. The parameter analysis and color-tunable properties pave the way towards white light PLED fabrication.
关键词： polymer light-emitting diode,F8BT,electrospraying,PLED,MEH-PPV,color-tunable
更新于2025-09-12 10:27:22
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Colloidal stable Hybrid Inorganic/Organic Nano-composites for Photovoltaic Applications
摘要： In present research work we have demonstrated high performance photovoltaic devices based on the colloidal stable TiO2 nanoparticles. The results demonstrates the higher Zeta potential (ζ) value for the as synthesized TiO2 NPs (+42.3mV) as compare to zeta potential of commercial TiO2 P25 ( -27 mV).The concept depicts enhancement in the charge transfer owing to better dispersion between TiO2 (aq) nanoparticles and MEH-PPV polymer matrix and high stability. The colloidal stability of TiO2 nanoparticles against agglomeration intended for the appropriate conduction pathways as electron acceptor. Poly [2-methoxy-5-(2’ethyl-hexyloxy)-1, 4-phenylene vinylene] (MEH-PPV) polymer have been used as a composite matrix in this study. The results demonstrates a significant improvement in I-V characteristics of device in the case of as synthesized colloidal stable TiO2 (aq) nanoparticles in comparison with commercial TiO2 (P25 Degussa). Thus, ITO/TiO2 (aq)/MEH-PPV/Al assembly device shows better charge transfer because good interaction takes place between TiO2 aq nanoparticles and polymer matrix. Subsequently, short circuit current value (Jsv= 1.9 μA) and open circuit voltage (Voc= 0.44 V) have been achieved .However, in the case of ITO/TiO2 (P25)/MEH-PPV/Al (II) assembly device less Jsc and Voc values 0.68 μA and 0.17 V have been monitored. The reported work may open a promising area of consideration among polymeric stable active layer, the requirement of the modern electronics.
关键词： MEH-PPV polymer,Photovoltaic device,Nanocomposites,TiO2 nanoparticles
更新于2025-09-12 10:27:22
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A low molecular weight OLED material: 2-(4-((2-hydroxyethyl)(methyl)amino)benzylidene)malononitrile. Synthesis, crystal structure, thin film morphology, spectroscopic characterization and DFT calculations
摘要： 2-(4-((2-Hydroxyethyl)(methyl)amino)benzylidene)malononitrile (HEMABM) was synthesized from 4-[hydroxymethyl(methyl)amino]benzaldehyde and propanedinitrile to obtain a low molecular weight fluorescent material with an efficient solid-state emission and electroluminescence properties comparable to the well-known poly(2-methoxy-5(20-ethyl)hexoxyphenylenevinylene) (MEH-PPV). The HEMABM was used to prepare an organic light-emitting diode by a solution process. Despite the title compound being a small molecule, it showed optical properties and notable capacity to form a film with smooth morphology (10.81 nm) closer to that of polymer MEH-PPV (10.63 nm). The preparation of the device was by spin coating, the electrical properties such as threshold voltage were about 1.0 V for both HEMABM and MEH-PPV, and the luminance 1300 cd m?2 for HEMABM and 2600 cd m?2 for MEH-PPV. IR, NMR, and EI. Besides this low molecular weight compound was characterized by SCXRD, a quantitative analysis of the intermolecular interactions by PIXEL, density functional theory (DFT) calculations are reported.
关键词： electroluminescence,OLED,MEH-PPV,low molecular weight,solution process,HEMABM
更新于2025-09-11 14:15:04
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[IEEE 2018 IEEE International Conference on Semiconductor Electronics (ICSE) - Kuala Lumpur (2018.8.15-2018.8.17)] 2018 IEEE International Conference on Semiconductor Electronics (ICSE) - Effect of ZnO Composition on the Electrical Properties of MEH-PPV: ZnO Nanocomposites Thin film via Spin Coating
摘要： Organic semiconductor have been commercialized for optoelectronic device application particularly in organic light emitting diodes (OLEDs). Poly [2-methoxy-5(2’ – ethylhexyloxy)-1, 4- phenylenevinylene), MEH-PPV used in optoelectronic devices because it is easily synthesized and deposited in high molecular weight and good purity. The MEH-PPV: ZnO nanocomposites was prepared by spin coating method at room temperature. The MEH-PPV: ZnO nanocomposites thin film was investigated at different ZnO compositions. The electrical properties showed the ZnO composition at 0.2 wt% exhibits the highest conductivity of nanocomposites thin film (7.40 x 10-1 S. cm-1) and suitable applied in optoelectronic devices.
关键词： MEH-PPV: ZnO nanocomposites thin film,electrical properties,spin coating,ZnO composition
更新于2025-09-04 15:30:14