- 标题
- 摘要
- 关键词
- 实验方案
- 产品
过滤筛选
- 2019
- temperature investigations
- electron multiplication
- electron-multiplying charge-coupled device
- light level
- electron-multiplying gain
- Optoelectronic Information Science and Engineering
- Peter the Great St. Petersburg Polytechnic University
- Saint Petersburg Electrotechnical University “LETI”
- Bonch-Bruevich Saint – Petersburg State University of Telecommunications
-
Polymer light-emitting displays with printed cathodes
摘要： High-resolution passive-matrix polymer light-emitting displays with printed cathodes are achieved by combining delicate cathode deposition and multifunctional buffer layer fabrication. Unlike other printing methods and printed materials, ink-jetting conducting nano-particles as cathode can provide high-resolution cathode patterns and excellent continuity along the fine cathode lines without any mechanical pressure on the organic layers. The buffer layer between the printed cathode and the organic active layers, was fabricated by mixing the water/alcohol-soluble polymer poly[9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene-alt-2,7-(9,9-dioctylfluorene)] (PFNR2) and a curable epoxy adhesive. It offers the functions of solvent-proof, electron-injection, and proper affinity with the cathode ink. While improving the performance of devices, especially blocking the leakage current greatly, the cross-linked buffer layer also induces a novel phenomenon of ‘linear η-J plot’, which can be derived to interesting and realistic results. Red, green, and blue monochrome and full-color polymer light-emitting displays with a content format of 96 × 3 × 64 show neither dead pixels nor dead lines. Under optimized steps of curing, the nano silver ink forms continuous, defect-free, and low-resistance cathode rows without any distortion. The red, green, and blue displays exhibit the current efficiencies of 0.62, 4.38 and 0.93 cd/A, and CIE color coordinates of (0.63, 0.37), (0.39, 0.57) and (0.18, 0.16), respectively. The cathode printing technique removes the need of high vacuum for thermal evaporation of the cathode metal, which could lead to the industrial roll-to-roll process to manufacture the flat panel displays.
关键词： Buffer Layer,PLED,Printed Cathode,Display
更新于2025-09-23 15:21:21
-
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
-
24.3: <i>Invited Paper:</i> Printed Electrodes for All‐Solution‐Processed Inverted‐Structure OLEDs
摘要： A key enabling technology for all-printed organic light-emitting diodes is printing electrodes that can be used for anodes or cathodes for conventional or inverted device structures. In both device structures, the first bottom electrodes, which are either transparent or opaque depending on the device structure, are typically printed while the last top electrodes have been deposited by using a vacuum-based evaporation process because when the last top electrodes are fabricated by using a solution-based process, under organic layers are easily damaged during the fabrication process. Although so-called transfer printing process has been often reported for organic devices such as organic solar cells, it has been rarely applied for OLEDs. In addition, no fine patterning has been adopted in such printing processes. As part of our efforts towards all-printed OLEDs, inkjet-printed and/or transfer-printed, finely-patterned PEDOT:PSS electrodes have been investigated in our lab and most recent achievement will be reported in detail. In order to implement all-solution-processed OLEDs, we also studied the inverted-structure OLEDs, which showed comparable results to the conventional structure OLEDs with the vacuum-based deposited electrodes.
关键词： inverted structure,Organic light-emitting diode,OLED,PLED,inkjet-printing,transfer-printing,polymer light-emitting diode
更新于2025-09-19 17:13:59
-
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
-
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
-
The Synthesis of Polyethersulfone (PES) and its Derivatives as Polymer Light Emitting Diode (PLED) Material
摘要： Nowadays some types of polymer are being developed as Polymer Light Emitting Diode (PLED) materials because they have some advantages compared to small molecule organic light emitting diode (SM-OLED). Polymers which have numerous conjugated double bonds can be used as PLED materials, such as the polyethersulfone (PES) and its derivatives. Therefore, further research on the synthesis of PES and its derivatives is needed to explore their potential as PLED materials. In this research, the synthesis of polyethersulfone has been performed utilizing Microwave Assisted Organic Synthesis (MAOS) method and subsequently the synthesized PES was being transformed into the nitrated PES (PES-NO2) and the aminated PES (PES-NH2) utilizing the conventional method (reflux). The structure of the synthesized polymers was confirmed by analyzing the FT-IR and 1H-NMR spectra data. The potent of the synthesized polymers as PLED material was analyzed from fluorescence emission spectral data (in NMP, N-methyl pyrrolidone) showing the maximum emission wavelengths in the blue light of visible area, which were 444 nm (PES); 356 nm and 444 nm (PES-NO2); and 440 nm (PES-NH2). These results showed that all of the synthesized polymers have the potent to be used as PLED.
关键词： MAOS,PES-NO2,fluorescence,PES,PES-NH2,PLED
更新于2025-09-11 14:15:04