Dye-doped submicron fiber waveguides composed of hole- and electron-transport materials

Ishii, Yuya; Omori, Keisho; Satozono, Shota; Fukuda, Mitsuo

doi:10.1016/j.orgel.2016.11.007

Cited by 8 publications

(6 citation statements)

References 27 publications

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“…The propagation loss of Fiber E was reduced to 5.9 dB cm –1 , which was the lowest propagation loss reported for WES polymer fibers. 6,7,9−15 Increase in fiber diameters normally decreases the propagation loss in the fibers, 27−29 but significant increase in the mean diameter was not observed after heating, as shown in Table 1, although the propagation loss was significantly reduced for all five fibers. This result shows that some other loss factors were reduced after heating.…”

Section: Resultsmentioning

confidence: 87%

“…3 Furthermore, wet-electrospun (WES) fibers can be produced from a wide variety of spinnable polymers and composites, including highly transparent polymers and optically active composites. 4−6 Thus, WES fibers are promising building blocks for small, flexible optical fiber devices, such as waveguides, sensors, and lasers. 6−11 However, high propagation loss in WES fibers, normally on the order of tens or thousands of decibels per centimeter in the visible light region, 6,7,9−15 has impeded their widespread use.…”

Section: Introductionmentioning

confidence: 99%

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Versatile Approach for Reducing Propagation Loss in Wet-Electrospun Polymer Fiber Waveguides

et al. 2018

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Wet-electrospun (WES) polymer micron and submicron fibers are promising building blocks for small, flexible optical fiber devices, such as waveguides, sensors, and lasers. WES polymer fibers have an inherent cylindrical geometry similar to that of optical fibers and a relatively large aspect ratio. Furthermore, WES fibers can be produced using low-cost and low-energy manufacturing techniques with large-area fabrication and a large variety of materials. However, the high propagation loss in the fibers, which is normally on the order of tens or thousands of decibels per centimeter in the visible light region, has impeded the use of these fibers in optical fiber devices. Here, the origin of propagation losses is examined to develop a comprehensive and versatile approach to reduce these losses. The excess light scattering that occurs in fibers due to their inhomogeneous density is one of the primary factors in the propagation loss. To reduce this loss, the light transmission characteristics were investigated for single WES polymer fibers heated at different temperatures. The propagation loss was significantly reduced from 17.0 to 8.1 dB cm –1 at 533 nm wavelength, by heating the fibers above their glass transition temperature, 49.8 °C. In addition, systematic verification of the possible loss factors in the fibers confirmed that the propagation loss reduction could be attributed to the reduction of extrinsic excess scattering loss. Heating WES polymer fibers above their glass transition temperature is a versatile approach for reducing the propagation loss and should be applicable to a variety of WES fibers. This finding paves the way for low-loss WES fiber waveguides and their subsequent application in small, flexible optical fiber devices, including waveguides, sensors, and lasers.

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Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Versatile Approach for Reducing Propagation Loss in Wet-Electrospun Polymer Fiber Waveguides

et al. 2018

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“…11 Since the crystallinity of nanomaterials can improve their charge carrier transport and enhance the performance of optical and optoelectronic devices, 12 the development of organised co-systems is essential for optoelectronic applications. Different approaches have been employed to obtain organised coassembled systems, including electrospinning 13 and template-assisted 8 and adsorbent-assisted physical vapour deposition (PVD) methods. 14 These methods are often tedious and require specific instrumentation.…”

Section: Comentario [Jm1]mentioning

confidence: 99%

Slow diffusion co-assembly as an efficient tool to tune colour emission in alkynyl benzoazoles

et al. 2020

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We report here the preparation of co-assembled microcrystals by employing an easy, reproducible and cost-effective technique, namely slow diffusion. 2,3]triazole and benzo [c][1,2,5]thiadiazole were chosen as host and guest skeletons, respectively. Structural similarities allowed the correct co-assembly of the two structures. The co-assemblies were studied by different techniques that included Raman spectroscopy and X-ray diffraction, amongst others. The waveguiding properties and the emission colour of the doped organic microcrystals were also investigated. It was found that changes in the molar ratio of the different doping agents could tune the light emission. Fluorescence microscopy images of the co-assembled microcrystals revealed light colour changes from green to whitish, up to CIE coordinates of (0.370, 0.385). These tunable colour-active materials could be useful in the fields of optoelectronics or lab-on-a-chip for integrated optical circuits at micro-/nanoscale.

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“…In addition to possessing these unique properties, polymer materials may be selected for specific purposes based on either their fibers or their functional material compositions, which may lead to the production of submicron fibers with the desired functionalities. Electrospinning (ES) is a simple and versatile technique for producing both submicron and micron fibers through varieties of polymers and composites that are spinnable . In addition, ES can potentially assist both low cost/energy manufacturing and large‐area fabrication by providing both high material utilization ratios and a high positional accuracies .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, ES can potentially assist both low cost/energy manufacturing and large‐area fabrication by providing both high material utilization ratios and a high positional accuracies . Hence, features of the ES technique make it possible to produce functional polymer submicron fiber devices, including generators, actuators, transistors, and waveguides . Several studies reported high piezoelectric performances for electrospun submicron fibers composed of piezoelectric polymers, such as poly(vinylidene fluoride) (PVDF) and poly(vinylidenefluoride‐ co ‐trifluoroethylene) (PVDF‐TrFE), without using a postpoling treatment .…”

Section: Introductionmentioning

confidence: 99%

Amorphous Electrically Actuating Submicron Fiber Waveguides

Ishii

Nobeshima

Sakai

et al. 2017

Macro Materials & Eng

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Amorphous electrically actuating submicron fiber waveguides are promising building blocks for creating novel opto‐electromechanical devices. In this study, waveguiding and electrically actuating properties of the waveguides composed of racemic poly(lactic acid) and a dye are investigated. The fibers have mean diameters of <0.4 µm, and each fiber demonstrates subwavelength waveguiding with a loss coefficient of 1.5 × 10−4–8.3 × 10−4 µm−1 at 0.63 µm wavelength. Light propagates with a near‐light speed group velocity between wavelengths of 0.59 and 0.63 µm, where the fraction of power inside the core is 0.13–0.28. The fiber mat thicknesses change in response to both the polarity and the magnitude of an applied voltage, similar to the inverse‐piezoelectric effect. The estimated values for both the apparent piezoelectric constant (29 000 × 10−12 m V−1) and Young's modulus (1.5 kPa) indicate a high degree of electricity actuation and a soft mat. Extremely small, soft, and electrically actuating waveguides can produce novel opto‐electromechanical devices.

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Dye-doped submicron fiber waveguides composed of hole- and electron-transport materials

Cited by 8 publications

References 27 publications

Versatile Approach for Reducing Propagation Loss in Wet-Electrospun Polymer Fiber Waveguides

Versatile Approach for Reducing Propagation Loss in Wet-Electrospun Polymer Fiber Waveguides

Slow diffusion co-assembly as an efficient tool to tune colour emission in alkynyl benzoazoles

Amorphous Electrically Actuating Submicron Fiber Waveguides

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