Optics & Photonics - Photonic Devices + Applications最新文献_第3页

Electrospun conjugated polymer nanofibers as miniaturized light sources: control of morphology, optical properties, and assembly 作为微型光源的电纺丝共轭聚合物纳米纤维:形态、光学性质和组装的控制

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2060989

A. Camposeo, V. Fasano, M. Moffa, A. Polini, D. Di Camillo, F. Ruggieri, S. Santucci, L. Lozzi, L. Persano, D. Pisignano

{"title":"Electrospun conjugated polymer nanofibers as miniaturized light sources: control of morphology, optical properties, and assembly","authors":"A. Camposeo, V. Fasano, M. Moffa, A. Polini, D. Di Camillo, F. Ruggieri, S. Santucci, L. Lozzi, L. Persano, D. Pisignano","doi":"10.1117/12.2060989","DOIUrl":"https://doi.org/10.1117/12.2060989","url":null,"abstract":"Light-emitting nanostructures made by conjugated polymers show interesting emission and electronic properties. In this work we report on novel approaches for the fabrication and control of light-emitting nanofibers by electrospinning. The shape, size and light-emitting properties of the fibers can be specifically tailored by acting on the composition of the solution used for the electrospinning process, an approach allowing for obtaining fibers ranging from micrometer-sized ribbons to almost cylindrical fibers with diameters down to few hundreds of nanometers. Moreover, following proper process optimization these fibers can also be precisely positioned in ordered arrays by near-field electrospinning, a method that exploits the stable region of the polymer jet. The possibility of precisely shaping the conjugated polymer fibers and of assembling the fiber in ordered arrays, combined with enhanced emission properties, opens interesting perspectives for developing novel emitting flexible nanomaterials suitable for light sourcing and optical sensing.","PeriodicalId":358951,"journal":{"name":"Optics & Photonics - Photonic Devices + Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115107009","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

Surface plasmon polariton modification in top-emitting organic light-emitting diodes for enhanced light outcoupling 顶发射有机发光二极管中表面等离子体激元的修饰增强了光的脱耦性

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2061585

Cornelius Fuchs, Tobias Schwab, Martin Wieczorek, M. Gather, S. Hofmann, K. Leo, R. Scholz

{"title":"Surface plasmon polariton modification in top-emitting organic light-emitting diodes for enhanced light outcoupling","authors":"Cornelius Fuchs, Tobias Schwab, Martin Wieczorek, M. Gather, S. Hofmann, K. Leo, R. Scholz","doi":"10.1117/12.2061585","DOIUrl":"https://doi.org/10.1117/12.2061585","url":null,"abstract":"We report on the enhanced light outcoupling efficiency of monochrome top-emitting organic light-emitting diodes (OLEDs). These OLEDs incorporate a hole transport layer (HTL) material with a substantially lower refractive index (∼ 1.5) than the emitter material or the standard HTL material (∼ 1.8) of a reference device. This low-index HTL is situated between the opaque bottom metal contact (anode) and the active emission layer. Compared to an HTL with common refractive index, the dispersion relation of the surface plasmon polariton (SPP) mode from the opaque metal contact is shifted to smaller in-plane wavenumbers. This shift enhances the outcoupling efficiency as it reduces the total dissipated power of the emitter. Furthermore, the excitation of the coupled SPPs at the thin transparent metal top contact (cathode) is avoided by using an ultrathin top electrode. Hence, the coupling of the electroluminescence from the emitter molecules to all non-radiative evanescent modes, with respect to the emitter material, is reduced by at least a factor of two, additionally increasing the outcoupling efficiency. Furthermore, for sufficiently high refractive index contrast the shift of the SPP at the anode/organic interface can lead to in-plane wavenumbers smaller than the wavenumber within the organic emitter layer and outcoupling of all excited modes by high index light extraction structures, e.g. microlens, seems feasible. In accordance to optical simulations, the external quantum efficiency is enhanced by about 20 % for monochrome green emitting OLEDs with low refractive index HTL compared to a reference sample.","PeriodicalId":358951,"journal":{"name":"Optics & Photonics - Photonic Devices + Applications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122417335","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: 3

The profiling of planar illuminative patterns using multiple white organic light-emitting diodes 使用多个白色有机发光二极管的平面照明图案的轮廓

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2060623

Henglong Yang, Lih-Jeih Chen, Yu-Hen Cheng, Wen-Cheng Chang

{"title":"The profiling of planar illuminative patterns using multiple white organic light-emitting diodes","authors":"Henglong Yang, Lih-Jeih Chen, Yu-Hen Cheng, Wen-Cheng Chang","doi":"10.1117/12.2060623","DOIUrl":"https://doi.org/10.1117/12.2060623","url":null,"abstract":"The feasibility of applying multiple white organic light-emitting diodes (WOLED) to establish specific planar illuminative patterns for general lighting without secondary optical components was experimentally investigated in smaller scale by using a single-axis automatic optical measuring system. Regular white light-emitting diodes (WLED) usually require secondary optical components to transform its point-source optical characteristics into specific planar illuminative pattern for general lighting application. WOLED has become a potential planar lighting source due to its unique device structure. The lighting source in our experiment consists of three WOLED's mounted side-by-side with changeable tilting angle. This adjustable lighting source with three planar WOLED's may be feasible for forming required illuminative pattern without using secondary optical components. Our preliminary experimental result measured from a 3-WOLED source with specific tilting angle in smaller scale suggests that a relatively uniform illuminative area can be established in practical mean without secondary optical components.","PeriodicalId":358951,"journal":{"name":"Optics & Photonics - Photonic Devices + Applications","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124252006","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

Concepts for the material development of phosphorescent organic materials processable from solution and their application in OLEDs 溶液可加工磷光有机材料的材料开发概念及其在oled中的应用

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2061005

S. Janietz, H. Krueger, M. Thesen, B. Salert, A. Wedel

{"title":"Concepts for the material development of phosphorescent organic materials processable from solution and their application in OLEDs","authors":"S. Janietz, H. Krueger, M. Thesen, B. Salert, A. Wedel","doi":"10.1117/12.2061005","DOIUrl":"https://doi.org/10.1117/12.2061005","url":null,"abstract":"One example of organic electronics is the application of polymer based light emitting devices (PLEDs). PLEDs are very attractive for large area and fine-pixel displays, lighting and signage. The polymers are more amenable to solution processing by printing techniques which are favourable for low cost production in large areas. With phosphorescent emitters like Ir-complexes higher quantum efficiencies were obtained than with fluorescent systems, especially if multilayer stack systems with separated charge transport and emitting layers were applied in the case of small molecules. Polymers exhibit the ability to integrate all the active components like the hole-, electron-transport and phosphorescent molecules in only one layer. Here, the active components of a phosphorescent system – triplet emitter, hole- and electron transport molecules – can be linked as a side group to a polystyrene main chain. By varying the molecular structures of the side groups as well as the composition of the side chains with respect to the triplet emitter, hole- and electron transport structure, and by blending with suitable glass-forming, so-called small molecules, brightness, efficiency and lifetime of the produced OLEDs can be optimized. By choosing the triplet emitter, such as iridium complexes, different emission colors can be specially set. Different substituted triazine molecules were introduced as side chain into a polystyrene backbone and applied as electron transport material in PLED blend systems. The influence of alkyl chain lengths of the performance will be discussed. For an optimized blend system with a green emitting phosphorescent Ir-complex efficiencies of 60 cd/A and an lifetime improvement of 66.000 h @ 1000 cd/m2 were achieved.","PeriodicalId":358951,"journal":{"name":"Optics & Photonics - Photonic Devices + Applications","volume":"9183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129083868","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

Molecular orientation, thermal behavior and density of electron and hole transport layers and the implication on device performance for OLEDs 电子和空穴输运层的分子取向、热行为和密度及其对oled器件性能的影响

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2062991

Kenneth L. Kearns, H. Na, R. Froese, S. Mukhopadhyay, H. Woodward, D. Welsh, T. D. De Vries, D. Devore, P. Trefonas, Liang Hong

{"title":"Molecular orientation, thermal behavior and density of electron and hole transport layers and the implication on device performance for OLEDs","authors":"Kenneth L. Kearns, H. Na, R. Froese, S. Mukhopadhyay, H. Woodward, D. Welsh, T. D. De Vries, D. Devore, P. Trefonas, Liang Hong","doi":"10.1117/12.2062991","DOIUrl":"https://doi.org/10.1117/12.2062991","url":null,"abstract":"Recent progress has shown that molecular orientation in vapor-deposited glasses can affect device performance. The deposition process can result in films where the molecular axis of the glass material is preferentially ordered to lie parallel to the plane of the substrate. Here, materials made within Dow’s Electronic Materials business showed enhanced performance when the orientation of the molecules, as measured by variable angle spectroscopic ellipsometry, was oriented in a more parallel fashion as compared to other materials. For one material, the anisotropic packing was observed in the as-deposited glass and was isotropic for solution-cast and annealed films. In addition, the density of an as-deposited N,N′-bis(naphthalene-1-yl)-N,N′-bis(phenyl)-2,2′-dimethylbenzidine (NPD) film was 0.8% greater than what was realized from slowly cooling the supercooled liquid. This enhanced density indicated that vapor-deposited molecules were packing more closely in addition to being anisotropic. Finally, upon heating the NPD film into the supercooled liquid state, both the density and anisotropic packing of the as-deposited glass was lost.","PeriodicalId":358951,"journal":{"name":"Optics & Photonics - Photonic Devices + Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121654416","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: 6

Device design for optimal exciton harvesting 最佳激子收集的装置设计

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2064731

G. Ingram, Z. Lu

引用次数: 0

Recent advances in stacked inverted top-emitting organic electrophosphorescent diodes (presentation video) 叠置倒置顶发射有机电磷光二极管的最新进展(演示视频)

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2062275

B. Kippelen, K. A. Knauer, E. Najafabadi, Yinhua Zhou, C. Fuentes-Hernandez

引用次数: 0

Towards fully spray coated organic light emitting devices 面向全喷涂有机发光器件

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2060994

K. Gilissen, J. Stryckers, J. Manca, W. Deferme

{"title":"Towards fully spray coated organic light emitting devices","authors":"K. Gilissen, J. Stryckers, J. Manca, W. Deferme","doi":"10.1117/12.2060994","DOIUrl":"https://doi.org/10.1117/12.2060994","url":null,"abstract":"Pi-conjugated polymer light emitting devices have the potential to be the next generation of solid state lighting. In order to achieve this goal, a low cost, efficient and large area production process is essential. Polymer based light emitting devices are generally deposited using techniques based on solution processing e.g.: spin coating, ink jet printing. These techniques are not well suited for cost-effective, high throughput, large area mass production of these organic devices. Ultrasonic spray deposition however, is a deposition technique that is fast, efficient and roll to roll compatible which can be easily scaled up for the production of large area polymer light emitting devices (PLEDs). This deposition technique has already successfully been employed to produce organic photovoltaic devices (OPV)1. Recently the electron blocking layer PEDOT:PSS2 and metal top contact3 have been successfully spray coated as part of the organic photovoltaic device stack. In this study, the effects of ultrasonic spray deposition of polymer light emitting devices are investigated. For the first time – to our knowledge -, spray coating of the active layer in PLED is demonstrated. Different solvents are tested to achieve the best possible spray-able dispersion. The active layer morphology is characterized and optimized to produce uniform films with optimal thickness. Furthermore these ultrasonic spray coated films are incorporated in the polymer light emitting device stack to investigate the device characteristics and efficiency. Our results show that after careful optimization of the active layer, ultrasonic spray coating is prime candidate as deposition technique for mass production of PLEDs.","PeriodicalId":358951,"journal":{"name":"Optics & Photonics - Photonic Devices + Applications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132332793","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: 3

Degradation of blue phosphorescent organic LEDs analyzed by solution NMR spectroscopy 溶液核磁共振光谱分析蓝色磷光有机led的降解

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2064518

Tatsuya Fukushima, Hajime Suzuki, Hiroto Ito, Shinya Ootsu, K. Hiyama, H. Kita, H. Kaji

引用次数: 0

Synthesis and characterization of heteroatom-bridged bisspirobifluorenes for the application of organic light-emitting diodes 应用于有机发光二极管的杂原子桥接双螺芴的合成与表征

Optics & Photonics - Photonic Devices + Applications Pub Date : 2014-10-08 DOI: 10.1117/12.2062431

Cheng-Lung Wu, Chao-Tsen Chen, Chin‐Ti Chen

引用次数: 18