Organic Photonics + Electronics最新文献_第7页

Polarized beam steering by use of multiply-cascaded rotating polarization gratings with biaxial anisotropy 利用具有双轴各向异性的多重级联旋转偏振光栅进行偏振光导向

Organic Photonics + Electronics Pub Date : 2021-09-02 DOI: 10.1117/12.2593679

M. Sakamoto, H. T. Nhan, Ryusei Momosaki, Kohei Noda, T. Sasaki, Tadayoshi Kamei, Takeya Sakai, Yukitoshi Hattori, N. Kawatsuki, H. Ono

引用次数: 0

Single layer, tunable, liquid crystal based Pancharatnam phase devices 单层，可调谐，基于液晶的Pancharatnam相位器件

Organic Photonics + Electronics Pub Date : 2021-09-02 DOI: 10.1117/12.2596462

Brandon Vreeland, Comrun Yousefzadeh, Andre VanRynbach, D. Bryant, P. Bos

引用次数: 0

Control of helical-axis orientation of chiral liquid crystals in monodispersed polymer particles 单分散聚合物颗粒中手性液晶螺旋轴取向的控制

Organic Photonics + Electronics Pub Date : 2021-09-02 DOI: 10.1117/12.2594452

Tomoki Shigeyama, K. Hisano, O. Tsutsumi

引用次数: 2

Cholestric bubbles as localized vortices: theory and experiments 胆汁泡作为局部涡旋:理论与实验

Organic Photonics + Electronics Pub Date : 2021-09-02 DOI: 10.1117/12.2593418

M. Clerc, G. González-Cortés, S. Echeverría-Alar

引用次数: 0

Alignment and disorganization of liquid crystals with carbon nanotubes aligning surfaces for novel applications 碳纳米管对准表面液晶的对准和破坏及其新应用

Organic Photonics + Electronics Pub Date : 2021-09-02 DOI: 10.1117/12.2596466

Md. Asiqur Rahman, Meenu Murali, K. Rodrigues, G. Scalia

{"title":"Alignment and disorganization of liquid crystals with carbon nanotubes aligning surfaces for novel applications","authors":"Md. Asiqur Rahman, Meenu Murali, K. Rodrigues, G. Scalia","doi":"10.1117/12.2596466","DOIUrl":"https://doi.org/10.1117/12.2596466","url":null,"abstract":"The structural characteristics of carbon nanotube (CNT) make them new interesting aligning layers for liquid crystals (LCs). These highly elongated nanoparticles have surface on which LC strongly anchor and with the use of CNTs sheets, continuous films of aligned CNTs can be easily obtained. Despite the fact that CNT sheets are inhomogenous layers since the linear networks of nanotubes cover partially the plane with gaps, of different distance, in the perpendicular direction and that their degree of orientational order can vary locally, with values well below 1, nematic LCs are oriented by the CNTs along their direction of alignment. The alignment of the LC can be clearly affected by the chosen geometry, as studied with symmetric and asymmetric boundary conditions. Certain alignment could be recognized even with only one aligning surface but two are needed for better and more uniform alignment. The orientational order of CNTs was measured by the anisotropic absorption and found being dependent on the processing steps that decrease its value. Higher value of orientational order of the CNTs seem to be relevant for improving the LC alignment even in the case of use of inorganic coatings of CNTs. With simple assemblies, using two substrates or a single one coated even with one CNT sheet, novel LC applications can be realized such as carbon nanotube-based flexible LCDs or pressure sensors.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126580005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Enhancing OLED outcoupling efficiency via atomistic-scale simulations 原子尺度模拟提高OLED解耦效率

Organic Photonics + Electronics Pub Date : 2021-08-17 DOI: 10.1117/12.2598154

P. Winget, H. Abroshan, H. Kwak, C. Brown, M. Halls

引用次数: 1

Perovskite based gas sensors: thin-film versus capillary-filled microchannel designs 钙钛矿基气体传感器:薄膜与毛细管填充微通道设计

Organic Photonics + Electronics Pub Date : 2021-08-16 DOI: 10.1117/12.2593734

M. S. Hossain, A. Takshi

{"title":"Perovskite based gas sensors: thin-film versus capillary-filled microchannel designs","authors":"M. S. Hossain, A. Takshi","doi":"10.1117/12.2593734","DOIUrl":"https://doi.org/10.1117/12.2593734","url":null,"abstract":"In the area of environmental monitoring, Volatile Organic Compounds (VOCs) have become a major concern. Specifically, in indoor environments, VOCs have been found to be linked with various health conditions-ranging from benign to lethal. Early detection of VOC gases can play a crucial role in ensuring a safe environment. In this work, we have looked into two different geometrical arrangements of methylammonium lead iodide (MAPbI3) perovskite to study how their selectivity and sensitivity towards an array of VOC gases under different illumination conditions may be affected. For the purpose of a comparative study, we tested the sensitivity of the device using two different photo-resistor designs, namely, (a) capillary-filled microchannels, where microchannels were created on indium tin oxide (ITO) coated plastic substrate, and leveraging the capillary motion force the microchannels were filled with the perovskite precursor solution, and (b) thin-film approach, where perovskite layers were spin coated on substrates with two conductive pads across. Samples of both designs were exposed to four analytes: acetone, ethanol, isopropanol, and methanol. In our previous study on the capillary design, we reported a decrease in photocurrent by about 22% upon exposure to methanol under illuminated conditions. The goal of this comparative study is to identify the viability of the photo-resistor design for fabricating a low-cost and fast-response gas sensor for the purpose of environmental monitoring.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123635692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A guide to qualitative haze measurements demonstrated on inkjet-printed silver electrodes for flexible OLEDs 用于柔性oled的喷墨印刷银电极的定性雾霾测量指南

Organic Photonics + Electronics Pub Date : 2021-08-09 DOI: 10.1117/12.2594486

Felix Hermerschmidt, Michael Hengge, V. Schröder, Paul Hänsch, K. Livanov, N. Zamoshchik, E. List‐Kratochvil

{"title":"A guide to qualitative haze measurements demonstrated on inkjet-printed silver electrodes for flexible OLEDs","authors":"Felix Hermerschmidt, Michael Hengge, V. Schröder, Paul Hänsch, K. Livanov, N. Zamoshchik, E. List‐Kratochvil","doi":"10.1117/12.2594486","DOIUrl":"https://doi.org/10.1117/12.2594486","url":null,"abstract":"The search for alternative transparent electrodes to the commonly used indium tin oxide (ITO) in optoelectronic devices has led to solution-based approaches based on inkjet printing. As an additive manufacturing technique that allows drops to be positioned only where necessary, inkjet printing shows reduced waste of starting material compared to other methods such as spin coating. As a result, functional materials can be both coated and structured without the need for masks or lithographic pre-patterning of the substrate. For this contribution, we utilized a particle-free silver ink to produce a transparent electrode by inkjet printing. After printing, the silver ions were reduced to metallic silver by an argon plasma. The process takes place at low temperatures (ca. 40 – 50°C), making it suitable for use with flexible substrates, which are often temperature-sensitive. The printed silver layers show good electrical conductivity and optical transmittance, with a crystalline grain structure being formed and maintained during the metallization process. This structure forms a self-organized nanometer-size grid, whose structure allows light to pass through. Due to its nano-structured property, the haze of the electrode was investigated using a simple experimental setup based on a light source shining through the electrode and analyzing the size of the projected pattern. Such qualitative assessment can be a useful indication of the quality of the electrode and we provide details on how to replicate this setup. The final electrodes were implemented in solution-processed OLEDs, which showed bright luminance and overall low haze compared to ITO-based reference devices.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132975655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Organic field effect transistors with bulk low doping 本体低掺杂有机场效应晶体管

Organic Photonics + Electronics Pub Date : 2021-08-04 DOI: 10.1117/12.2594721

Raj Kishen Radha Krishnan, Shiyi Liu, Drona Dahal, P. Paudel, B. Lüssem

引用次数: 0

Density functional theory analysis of perovskite at ambient temperature 环境温度下钙钛矿密度泛函理论分析

Organic Photonics + Electronics Pub Date : 2021-08-04 DOI: 10.1117/12.2594937

Jon Bebeau, A. Takshi

{"title":"Density functional theory analysis of perovskite at ambient temperature","authors":"Jon Bebeau, A. Takshi","doi":"10.1117/12.2594937","DOIUrl":"https://doi.org/10.1117/12.2594937","url":null,"abstract":"Despite the fast growth of using perovskite materials in solar cells and photo-sensors, there are still many unanswered questions about the processes for their unique electro-optical properties. In this regard, simulation of the material can help for better understanding of the perovskites’ properties. In this study, we have investigated the crystalline structure of methylammonium lead iodide, MAPbI3, perovskite using the density functional theory (DFT). The majority of DFT modeling of perovskite targets the ground state, at 0 K. Analysis at ground state simplifies several quantum mechanical effects and the model results are enlightening. Yet for practical application at ambient temperature, DFT models must include more physical processes which involve making mathematical simplifications and quantum mechanical assumptions to simplify the computations. Here we delved into the practical implication of the move from theory to practical algorithms and tools, identified the range of current computational implications and limitations, the problems of accurately modeling these substances at room temperature, the computational costs, expected results afforded by DFT models for real, practical materials. We have surveyed the required extensions needed to perform DFT on MAPbI3 which necessarily include the temperature modeling, crystal vibrational and frame deformation, phonon action and the novel characteristics of a free MA cation constrained within a Pb-I structure. The developed algorithm for the DFT analysis of perovskite can then be used as a tool for further study of the effect of various factors on the material properties.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121326883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0