- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Photo-Cross-Linkable Polymer Inks for Solution-Based OLED Fabrication
摘要： We introduce a catalyst-free, highly e?cient, ambient temperature Diels?Alder reaction employing o-methylbenzaldehyde derivatives as photocaged dienes as an ideal approach for forming three-dimensional insoluble networks for inkjet printing of OLED emissive layer. Herein, poly(methyl methacrylate) based polymers containing 4-(9H-carbazol-9-yl)-2-(3′-hydroxy-[1,1′-biphenyl]-3-yl)isoindoline-1,3-dione as a blue-green (λ max = 495?500 nm) thermally activated delayed ?uorescence (TADF) emitter and a photochemically active maleimide/o-methylbenzaldehyde cross-linker couple were synthesized and their photo-cross-linking behavior was studied. Time resolved ?uorescence measurements con?rm that the TADF properties are maintained upon integration in a polymer network and HOMO/LUMO levels of the emitter species remain unchanged by the photo-cross-linking at 365 nm of the polymer chains. The network formation of the ?uorescent ?lms is evidenced by solvent resistance tests and monitored by Fourier transform infrared (FT-IR) spectroscopy as well as time of ?ight secondary ion mass spectroscopy (ToF-SIMS), showing the consumption of maleimide and o-methylbenzaldehyde groups with increasing irradiation time. The surface roughness is investigated via atomic force microscopy (AFM) and found to be unchanged by a solvent wash after the cross-linking. Furthermore, con?rmation that the polymer solution can be printed on an inkjet-printer and subsequently photo-cross-linked for multilayer OLED device fabrication is obtained.
关键词： photo-cross-linking,TADF emitter,polymer network,Diels?Alder reaction,inkjet printing,OLED
更新于2025-09-12 10:27:22
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Laser Irradiation for Improving the Wetting of Nanoparticle Gold Inks for Printed Electronics
摘要： Digital printing technologies such as inkjet or Aerosol Jet are becoming increasingly interesting for the manufacturing of electronic devices. As a maskless and contactless process it offers the potential for low-cost deposition of functional materials onto flat, flexible or 3D-substrates. Common inks used for printed electronics are nanoparticle metal inks. Silver (Ag) is widely used because of its excellent conductivity, but also gold (Au) inks are of interest for several applications. By using nanoparticle inks it is possible to integrate conductive paths and sensors onto temperature sensitive substrate materials such as polymers. Polymers often need a pretreatment like a plasma treatment for improving the wetting. Plasma treatment usually changes the wetting behavior of the complete substrate surface. This could be critical for some applications, e.g. fluidic applications, where the original properties of the substrate should be kept. Low pressure plasma as a vacuum process is also difficult for implementation into an existing process. In this work laser irradiation for local improvement of wetting of an inkjet-printed gold ink on polymer substrates is investigated. The experiments show that laser irradiation is a very promising technique for the modification of polymer surfaces and suitable for inkjet printing nanoparticle inks on hydrophobic polymer surfaces. This offers new opportunities for printed electronics, which could be easily integrated into existing processes.
关键词： laser pretreatment,wetting,gold ink,inkjet printing
更新于2025-09-12 10:27:22
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Accelerating the Screening of Perovskite Compositions for Photovoltaic Applications through High‐Throughput Inkjet Printing
摘要： The exploration and optimization of numerous mixed perovskite compositions are causing a strong demand for high-throughput synthesis. Nevertheless high-throughput fabrication of perovskite films with representative film properties, which can efficiently screen the perovskite compositions for photovoltaic applications, has rarely been explored. A high-throughput inkjet printing approach that can automatically fabricate perovskite films with various compositions with high reproducibility and high speed is developed. The automatic sequential printing of four precursors forms 25 mixed films in a fast and reproducible manner. The obtained bandgaps, photoluminescence (PL) peak positions, and PL lifetimes allow for the efficient screening of perovskite compositions for photovoltaic applications. To exemplify this concept, among 25 tested films, two compositions CH3NH3PbBr0.75I2.25 (MA) and (HC(NH2)2)0.75(CH3NH3)0.25PbBr0.75I2.25 (FA0.75MA0.25) with a long (237 ns) and short (49.0 ns) PL lifetime, respectively, are screened out for device investigations. As expected, the MA-based device exhibits a much higher efficiency (19.0%) than that (15.3%) of the FA0.75MA0.25 counterpart. This efficiency improvement is mainly ascribed to a smaller dark saturate current density, a lower level of energetic disorder, more efficient charge transfer and decreased charge recombination losses, which are consistent with the much longer PL lifetime in the database.
关键词： perovskites,photovoltaic applications,inkjet printing,high throughput fabrication
更新于2025-09-11 14:15:04
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31.1: <i>Invited Paper:</i> Systematic Design of Jettable Inks for Printed O/Pled
摘要： Inkjet printing represents an accurate and non-contact printing technique which has been widely investigated as a valuable tool in the preparation of organic light emitting diodes (OLED). The working principle of inkjet printing is to eject inks from nozzles with a diameter of 10-100 μm to a specified position on a treated substrate, and then the deposited ink is dried to evaporate the solvent to form the thin film with a predesigned pattern. Comparing with the conventional solution processing technologies, such as spin coating, gravure printing and screen printing, inkjet printing exhibits the merits of being mask-free, material saving, pattern replacing easily and compatible with flexible plastic substrates, which is promising for the significant technology of large-scale, low-cost, and flexible displays based on OLED.
关键词： TADF polymer,PLED,solvent system,Inkjet printing,OLED
更新于2025-09-11 14:15:04
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Inkjet seeded CVD-grown hydrogenated diamond gas sensor under UV-LED illumination
摘要： Hydrogen-terminated diamond gas sensors have been prepared by selective deposition of nanodiamond ink using direct inkjet printing on interdigital electrodes, followed by chemical vapor deposition growth of a nanoctrystalline diamond layer. The structure of the deposited layer was characterised and analyzed by scanning electron microscopy and Raman spectroscopy. The effect of ultraviolet light-emitting diode (UV-LED) illumination on the performance of the hydrogen-terminated diamond gas sensor with regard to reducing (NH3) and oxidizing (NO2) gases at various temperatures was studied. UV-LED illumination showed a short response / recovery time to NH3 and NO2 gases, 97 s / 153 s, and 72 s / 186 s respectively.
关键词： UV light,gas sensor,inkjet printing,hydrogenated-diamond
更新于2025-09-11 14:15:04
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High‐Resolution Inkjet Printing of Quantum Dot Light‐Emitting Microdiode Arrays
摘要： The direct printing of microscale quantum dot light-emitting diodes (QLEDs) is a cost-effective alternative to the placement of pre-formed LEDs. The quality of printed QLEDs currently is limited by nonuniformities in droplet formation, wetting, and drying during inkjet printing. Here, optimal ink formulation which can suppress nonuniformities at the pixel and array levels is demonstrated. A solvent mixture is used to tune the ejected droplet size, ensure wetting, and provoke Marangoni flows that prevent coffee stain rings. Arrays of green QLED devices are printed at a resolution of 500 pixels in.?1 with a maximum luminance of ≈3000 cd m?2 and a peak current efficiency of 2.8 cd A?1. The resulting array quality is sufficient to print displays at state-of-the-art resolutions.
关键词： light-emitting diodes,quantum dots,uniform pixel arrays,inkjet printing,high resolution
更新于2025-09-11 14:15:04
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Advances in Inkjet‐Printed Metal‐Halide Perovskite Photovoltaic and Optoelectronic Devices
摘要： Inkjet-printing (IJP) has evolved over the last 30 years into a reliable, versatile and cost-effective industrial production technology in many areas from graphics to printed electronic applications. Intensive research efforts have led to the successful development of functional electronic inks to realize printed circuit boards, sensors, lighting, actuators, energy storage and power generation devices. Recently, a promising solution-processable material class has entered the stage: metal halide perovskites (MHP). Within just ten years of research, the efficiency of perovskite solar cells (PSCs) on a laboratory scale increased to over 25%. Despite the complex nature of MHPs, significant progress has also been made in controlling film formation in terms of ink development, substrate wetting behavior and crystallization processes of inkjet-printed MHPs. This results in highly efficient inkjet-printed PSCs with a PCE of almost 21%, paving the way for cost-effective and highly efficient thin film solar cell technology. In addition, the excellent optoelectronic properties of inkjet-printed MHPs achieve remarkable results in photodetectors, X-ray detectors and illumination applications. This manuscript provides a comprehensive overview of the state of the art and recent advances in the production of inkjet-printed MHPs for highly efficient and innovative optoelectronic devices.
关键词： additive manufacturing,optoelectronic,perovskite,inkjet printing,light emitting devices,solar cells
更新于2025-09-11 14:15:04
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Non-Fullerene Based Printed Organic Photodiodes with High Responsivity and MHz Detection Speed
摘要： Digitally printed organic photodiodes (OPDs) are of great interest for the cost-efficient additive manufacturing of single and multi-device detection systems with full freedom of design. Recently reported high-performance non-fullerene acceptors (NFAs) can address the crucial demands of future applications in terms of high operational speed, tunable spectral response as well as device stability. Here, we present the first demonstration of inkjet and aerosol-jet printed OPDs based on the high-performance NFA, IDTBR, in combination with poly(3-hexylthiophene) (P3HT) exhibiting a spectral response up to the NIR. These digitally printed devices reach record responsivities up to 300 mA/W in the visible and NIR spectrum competing with current commercially available technologies based on Si. Furthermore, their fast dynamic response with cut-off frequencies surpassing 2 MHz outperforms most of the state-of the-art organic photodiodes. The successful process translation from spincoating to printing is highlighted by the marginal loss in performance compared to the reference devices, which reach responsivities of 400mA/W and detection speeds of more than 4 MHz. The achieved high device performance and the industrial relevance of the developed fabrication process provide NFAs with an enormous potential for the development of printed photodetection systems.
关键词： aerosol-jet printing,spectral responsivity,non-fullerene acceptor,inkjet printing,digital printing,organic photodiode
更新于2025-09-10 09:29:36
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Uniform Insulating Properties of Low-Temperature Curable Gate Dielectric for Organic Thin-Film Transistor Arrays on Plastic Substrate
摘要： Achieving a high-resolution display on a plastic substrate requires a to ensure dimensional stability during fabrication process, including the deposition of gate dielectrics. Evaluation platform to confirm the uniform insulating properties of organic dielectric material prior to actual application to organic thin-film transistor (OTFT) arrays was proposed. This test method enabled verification of the suitability of the low-temperature curable dielectric and chemical resistance during fabrication process. A cross-linked poly(hydroxy imide) (PHI) that can be cured at a low temperature of 130°C exhibited stable insulating properties in a large area that sudden breakdown was not observed in an electric field up to 4 MV/cm. Thiophene-thiazole-based copolymer semiconductor was used as an active layer and inkjet-printed. In all the processes, the temperature of the substrate was kept below 130°C, and 4.8-inch electrophoretic display panels on a polyethylene naphthalate (PEN) substrate with a resolution of 98 dpi was demonstrated.
关键词： Organic thin-film transistors,Organic gate dielectric,Plastic substrates,Low-temperature process,Polymer semiconductor,Flexible displays,Inkjet printing
更新于2025-09-10 09:29:36
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[IEEE 2018 41st International Spring Seminar on Electronics Technology (ISSE) - Zlatibor, Serbia (2018.5.16-2018.5.20)] 2018 41st International Spring Seminar on Electronics Technology (ISSE) - Viscosity of Silver Based Nano-Inks
摘要： The paper deals with the analysis and viscosity measurements of five commonly available silver based nano-inks at different temperatures. The kind of solvent, dimension of nano-particles and temperature play a key role for the viscosity of nano-inks. For the controlling of the deposition process of nano-inks by inkjet printing technology, knowledge of the rheological properties of applied nano-inks are necessary. It is really difficult to preserve the stable temperature in the printing nozzle during the deposition process, for this reason the voltage signal which is controlling the piezo-elements in the nozzle has to be modified due to the viscosity changes. For this reason, this paper offers the practical results from the viscosity measurements, which were done by rheometer MCR 502 Anton Paar. Furthermore, the paper offers the comparative study of the viscosity measurements of different kind of silver based nano-inks. The twin gap method was applied due to achieving of high accuracy of measurements. As the preliminary results show, the viscosity of silver based nano-inks has the strong dependence on the temperature.
关键词： silver based nano-inks,rheometer,viscosity,inkjet printing,twin gap method
更新于2025-09-10 09:29:36