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- 2019
- 2018
- solution deposition
- printable electronic transport layer
- multilayer OLEDs
- fully inkjet printed
- terahertz
- vector fitting
- impedance
- multilayer graphene
- Optoelectronic Information Science and Engineering
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Nanjing University of Posts and Telecommunications
- Peking University
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Performance analysis of laser-treated hot forging dies with WC-Co-Cr
摘要： The service life of hot forging dies was evaluated after being subjected in a double-layer surface treatment. The dies were laser treated, using WC-Co-Cr powder, and then surface nitrided. Previously, the integrity of the layers was proven metallographically. Information about the properties of the surface was measured in order to be used later for the wear calculation. The performance of the treated die compared with the normal one was first assessed by FEM wear simulation. The areas with increased wear were determined, and with the aid of an analytical model, the total wear was predicted after predetermined number of forging cycles. Later, forging dies were manufactured, surface treated, and utilized in real production environment. The results suggested an improvement of 41% and 94% for the different forging trials which also is in good agreement with the simulation results.
关键词： WC-Co-Cr,Laser,Multilayer,Wear,Surface treatment,FEM,Hot forging
更新于2025-09-16 10:30:52
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Mathematical Modelling of Electrically Controlled Filters of Microwave, subTHz and THza??bands on the Base of Grapheneand-Dielectric Multilayer Structure
摘要： Report is devoted to investigations of graphene meta–surfaces for the transmission of radiation induced by plasmons in subTHz and THz ranges, cell of which consists of structures based on graphene ring and graphene nano–tape. It create regimes of radiation transmission – transparency windows induced by electric dipole resonances. Resonant frequency of transparency window can be dynamically tuned in wide band of subTHz and THz bands by changing the chemical potential (Fermi energy) of graphene by applying external electric field (gating) instead of re–fabricating of structures. Questions of possibilities of electronic controlled filters creating of subTHz and THz bands grounded on different configurations of graphene meta–surfaces are discussed; their characteristics and frequency dependencies are investigated. Mathematical modelling and electrodynamic calculation of the filters characteristics of subTHz and THz bands grounded on multilayer structures of “graphene–dielectric” type are carried out. From results of mathematical modelling it follows that periodic layered microstructures “graphene–dielectric” type can be used for creation of subTHz and THz bands broadband filters of planar construction, controlling by electric field and fast tuning at small changes in Fermi energy level of graphene.
关键词： multilayer structures,filters,subTHz,plasmonic,chemical potential,electric field,graphene,meta-surfaces,electric dipole resonances,THz,Fermi energy
更新于2025-09-16 10:30:52
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Starburst-type triarylphosphine oxide trimers forming a stable amorphous n-type layer in solution-processed multilayer OLED
摘要： Novel starburst-type triphenylphosphine oxide trimers PO-1 and PO-2 were synthesized aimed at application as an electron-transporting material for multilayer organic light-emitting diodes (OLEDs). They showed high glass transition temperatures (Tg; 175 and 205 (cid:1)C, respectively) and high lowest triplet energies (T1; 2.81 and 2.78 eV, respectively). Their high solubility in 2-propanol allowed us to fabricate multilayer OLEDs by solution processing, and a double-emitting layer OLED consisting of poly(9-vinylcarbazole)-based p-type and PO-1-based n-type layers doped with a phosphorescent material (FIrpic) showed efficient sky-blue electroluminescence with a maximum external quantum efficiency of 9.33%.
关键词： Solution processing,Organic light-emitting diode,Phosphine oxide,Double emitting layer,Multilayer,Electron-transporting material
更新于2025-09-16 10:30:52
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Display Technology 2019: Never a Dull Moment
摘要： This study investigates standard and regional algal pigment index 1 (API1) estimates in the Atlantic off the southwestern Iberian Peninsula. Standard API1 data are those delivered by the Medium Resolution Imaging Spectrometer (MERIS) orbiting sensor. Equivalent quantities are computed by applying a regional inversion scheme using as input both MERIS and in situ remote sensing re?ectances (Rrs). Reference data for the development of the regional algorithm and for the analysis of tested products include ?eld measurements of total concentration of chlorophyll a (TChla) and coincident Rrs values collected at different distances from the coast. Validation results, based on matchup analysis, identifies a systematic overestimation of standard API1 versus the reference TChla values. The additional comparison of product maps in selected regions of interest confirms this tendency and demonstrates the feasibility and relevance of using regional algorithms for investigating spaceborne products. Analogous applications are hence devised for the early-stage evaluation of the forthcoming Sentinel-3/OLCI data products.
关键词： ocean color,remote sensing re?ectance,Medium Resolution Imaging Spectrometer (MERIS) algal pigment index 1 (API1),multilayer perceptron (MLP) neural nets
更新于2025-09-16 10:30:52
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Fano approximation for coupled modes in metal-dielectric multilayer structures
摘要： We study the response of coupled modes in metal-dielectric multilayer planar structures consisting of a metal layer attached to a high-index waveguide by a low-index spacer layer. The structure supports excitation and coupling of a surface plasmon polariton mode and a waveguide mode. A coupled-mode model is developed to analyse the field transfer processes and describe the appearance of Fano resonances as a result of the modes interaction. It is demonstrated that the response of the plasmonic mode can be well fitted to a Fano function that allows extraction of width, height, sensitivity, and field enhancement.
关键词： coupled modes,metal-dielectric multilayer structures,Fano resonances,surface plasmon polariton,waveguide mode
更新于2025-09-12 10:27:22
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AIP Conference Proceedings [AIP Publishing 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Fes, Morocco (25–27 March 2019)] 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Multilayer optical routing by means of vertical directional coupler with long range surface plasmons
摘要： We show that e?cient multilayer optical routing is achievable with long range surface plasmon polaritons (LR-SPP) through an accurate design of vertical directional couplers (VDC). Our theoretical results suggest that by suitably tuning some geometrical parameters, in particular the path length and bend radius, it is possible to obtain a good control on the overall interaction, even in presence of fabrication non-idealities. We present a top-down fabrication process ?ow for LR-SPP multilayer optical circuits, obtained by stacking multiple ultrathin nanometric metal ?lms within a polymeric dielectric background; the overall structure has a good degree of mechanical stability. By pro?ting from the topological advantage given by VDCs, as one of the useful applications of our work, we propose a new optical integrated circuit architecture scheme, capable of connecting two separate circuit paths without in?uencing the geometry or signi?cantly promoting crosstalk with any other path in the middle. The possibility to develop vertically stacked optical integrated circuits upon electronic integrated circuits makes LR-SPPs a good technology for the production of inexpensive and high-density network systems.
关键词： optical integrated circuits,long range surface plasmons,multilayer optical routing,vertical directional coupler
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE 2nd International Conference on Electronics Technology (ICET) - Chengdu, China (2019.5.10-2019.5.13)] 2019 IEEE 2nd International Conference on Electronics Technology (ICET) - High Efficiency Fully Inkjet Printed Multilayer OLEDs Using A Printable Organic Electronic Transport Layer
摘要： High efficiency fully inkjet printed multilayer OLEDs have been successfully developed using a printable organic electronic transport layer (ETL). Through a proper selection of solvents, we prepared a jettable and stable ETL ink with commercially soluble electronic transport material. The fully inkjet printed multilayer green phosphorescent OLEDs showed a high luminous efficiency of 55.5 cd A-1 at a brightness of 1000 cd m-2 with an external quantum efficiency (EQE) of 14.8%. The results demonstrated that the solution deposition of inkjet printed ETL caused little damage to the underlying emission layer (EML).
关键词： solution deposition,printable electronic transport layer,multilayer OLEDs,fully inkjet printed
更新于2025-09-12 10:27:22
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Simulation of Multilayer Energy Efficient OLEDs for Flexible Electronics Applications
摘要： Organic light emitting (OLEDs) work on electro luminescence principles and these OLEDs are commercially available and can be used in display because of the low power consumption. Proposed research deals with the design of high-efficiency OLEDs, including electrical and optical design of OLEDs. The Luminescent efficiency of bilayer and Triple layer OLED experiment and analysis was done using the Silvaco TCAD tool in this research work. The simulation of electronics and optical features such luminescence power versus anode voltage, anode voltage versus anode current characteristics and exciton state of both bilayer and Triple layer OLEDs were discussed. The physical design, processes as well as principles of OLED has been discussed and operational distribution of Langevin recombination inside proposed structures were acquired and discussed.
关键词： Efficiency Improvement,Organic Light emitting diode (OLEDs),Multilayer,TCAD
更新于2025-09-12 10:27:22
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Gap‐Mode Plasmon‐Induced Photovoltaic Effect in a Vertical Multilayer Graphene Homojunction
摘要： Gap-mode plasmons that occur between metallic nanoparticles and metallic films separated by a thin spacer have been widely studied in the field of nano-optics and plasmonics for enhancing the light–matter interaction of graphene and other two-dimensional (2D) materials. However, efficient photovoltaic devices using such gap-mode plasmons have not been achieved because of structural difficulties. Here, a gap-mode plasmon-induced asymmetric vertical homojunction photovoltaic device using multilayer graphene is presented. In this structure, the multilayer graphene acts both as a photo-carrier generation layer and as a spacer for the gap-mode plasmon. The optical absorption of graphene is further enhanced by the presence of gap-mode plasmons, and the photoresponse time is extremely short because of the atomically short channel lengths across the vertical direction. The wavelength dependence of the gap-mode plasmon is also investigated for three devices with different metal electrodes by photocurrent measurement at five different wavelengths and numerical simulations. The device strategies implemented in this work can enhance the performance of graphene-based vertical photonic devices and can be applied to other 2D materials-based photonic devices.
关键词： vertical structures,homojunction,gap-mode plasmons,photovoltaics,multilayer graphene
更新于2025-09-12 10:27:22
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Thickness measurement of multilayer film stack in perovskite solar cell using spectroscopic ellipsometry
摘要： The rapid surge in perovskite solar cell efficiency has necessitated the development of viable metrology techniques during device integration, paving the way for commercialization. Ellipsometry is considered the most appropriate technique for fast and accurate thickness measurement for large scale production. However, a precise and well-calibrated model is a prerequisite for this technique. While ellipsometry of individual device layers has been reported in recent perovskite literature, a comprehensive multilayer modeling approach is thus far unavailable. Perovskite optoelectronic devices generally consist of a six-layer film stack with three transparent layers required for optical absorption in the perovskite layer. Spin casted thin films, now common in this line of research, impart their own difficulties into ellipsometric modeling. Roughnesses at each heterointerface, similarities in optical spectra of transparent layers, and anomalous dispersion of perovskite are just a few of such challenges. In this work, we report the process of building an ellipsometry model from scratch for thickness measurement of methylammonium lead iodide (MAPI) perovskite and indium tin oxide (ITO)/hole transport layer (HTL) bilayer thin film stacks on a glass substrate. Three promising representatives of HTLs (CuI, Cu2O, and PEDOT:PSS) were studied. The models were extended to measure the individual layer thicknesses of the MAPI/HTL/ITO film stack on a glass substrate using the models developed for individual layers. Optical constants of all the representative thin films were thus extracted for a wide wavelength range (300 nm–900 nm).
关键词： perovskite solar cell,spectroscopic ellipsometry,multilayer film stack,optical constants,thickness measurement
更新于2025-09-12 10:27:22