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Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices

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https://www.readbyqxmd.com/read/29430302/impact-of-the-synthesis-method-on-the-solid-state-charge-transport-of-radical-polymers
#1
Yiren Zhang, Albert Park, Alicia Cintora, Stephen R McMillan, Nicholas J Harmon, Austin Moehle, Michael E Flatté, Gregory D Fuchs, Christopher K Ober
There are conflicting reports in the literature about the presence of room temperature conductivity in poly(2,2,6,6-tetramethylpiperidinyloxy methacrylate) (PTMA), a redox active polymer with radical groups pendent to an insulating backbone. To understand the variability in the findings across the literature and synthetic methods, we prepared PTMA using three living methods - anionic, ATRP and RAFT polymerization. We find that all three synthetic methods produce PTMA with radical yields of 70 - 80%, controlled molecular weight, and low dispersity...
January 7, 2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/29308205/fluoride-sulfophosphate-glasses-as-hosts-for-broadband-optical-amplification-through-transition-metal-activators
#2
W C Wang, Q H Le, Q Y Zhang, L Wondraczek
Unusually stable multi-anion glasses of the fluoride-sulfophosphate type (FPS) are introduced as a new host material for optically active cation species. Despite a notoriously low polymerization grade, anion mixing in this glass system enables facile manufacture of bulk or fiber devices which combine several advantages of fluoride and phosphate glasses while using the stabilizing effect of sulfate additions. Using the example of chromium doping, we demonstrate broad red photoluminescence at 734 nm and inhomogeneous broadening of the R -line at 694 nm, originating from the 4 T2 → 4 A2 and 2 E → 4 A2 transitions of Cr3+ , respectively...
August 21, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/29308204/increasing-the-horizontal-orientation-of-transition-dipole-moments-in-solution-processed-small-molecular-emitters
#3
Alessia Senes, Stefan C J Meskers, Horst Greiner, Katsuaki Suzuki, Hironori Kaji, Chihaya Adachi, Joanne S Wilson, René A J Janssen
The efficiency of organic light emitting diodes (OLEDs) can be improved by controlling the orientation of the transition dipole moment of the emitters. Currently, no effective methods exist for orienting the transition dipole moments in solution processed active layers for OLEDs. We investigate the orientation of the transition dipole moment of small molecular emitters in a host matrix of poly(9,9-dioctylfluorene) (PFO) by means of angle dependent luminescence intensity measurements. The polymer chains of the host orient predominantly in the plane of the film...
July 14, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/29599983/patterning-and-fluorescence-tuning-of-quantum-dots-with-haptic-interfaced-bubble-printing
#4
Bharath Bangalore Rajeeva, Majd A Alabandi, Linhan Lin, Evan P Perillo, Andrew K Dunn, Yuebing Zheng
Semiconductor quantum dots (QDs) are attractive for a wide range of applications such as displays, light-emitting devices, and sensors due to their properties such as tunable fluorescence wavelength, high brightness, and narrow bandwidth. Most of the applications require precise patterning of QDs with targeted properties on solid-state substrates. Herein, we have developed a haptic-interfaced bubble printing (HIBP) technique to enable high-resolution (510 nm) high-throughput (>104 μm s-1 ) patterning of QDs with strong emission tunability and to significantly enhance the accessibility of the technique via a smartphone device...
June 21, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/29057077/the-impact-of-aggregation-on-the-p-doping-kinetics-of-poly-3-hexylthiophene
#5
Frederick M McFarland, Lindsey Bonnette, Elisha A Acres, Song Guo
The morphological effects of regioregular poly(3-hexylthiophene) (P3HT) on its p-doping kinetics with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4 -TCNQ) in solution are studied using optical absorption spectroscopy and stopped-flow technique. Two morphological forms, solubilized (s-P3HT) and nanowhiskers (nw-P3HT), are investigated. Both P3HT solubilized and aggregated solutions show similar characteristic near-IR absorption bands for integer charge transfer products with F4 -TCNQ. Kinetic analysis on p-doping of s-P3HT with F4 -TCNQ indicates that the doping reaction proceeds with a single reaction mechanism that is first order in s-P3HT...
June 21, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28515937/dicyano-and-tetracyanopentacene-foundation-of-an-intriguing-new-class-of-easy-to-synthesize-organic-semiconductors
#6
Florian Glöcklhofer, Andreas Petritz, Esther Karner, Michael J Bojdys, Barbara Stadlober, Johannes Fröhlich, Miriam M Unterlass
Cyanated pentacenes are very promising candidate materials for ambipolar and n-type transistors. However, only a few examples have been obtained to date - all requiring lengthy, multi-step processes. Herein, we present the first preparation of 5,7,12,14-tetracyanopentacene (TCP) and a facile, scaled-up preparation of 6,13-dicyanopentacene (DCP). Both compounds are prepared by a one-pot synthesis using cheap quinones as starting materials. Detailed crystallographic investigations evince that the bulk assemblies of both cyanated pentacenes are dominated by non-covalent interactions, resulting in a dense, stable, face-to-face packing and in an intriguing packing motif for TCP...
March 14, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28496981/electron-injection-and-scaffold-effects-in-perovskite-solar-cells
#7
Miguel Anaya, Wei Zhang, Bruno Clasen Hames, Yuelong Li, Francisco Fabregat-Santiago, Mauricio E Calvo, Henry J Snaith, Hernán Míguez, Iván Mora-Seró
In spite of the impressive efficiencies reported for perovskite solar cells (PSCs), key aspects of their working principles, such as electron injection at the contacts or the suitability of the utilization of a specific scaffold layer, are not yet fully understood. Increasingly complex scaffolds attained by the sequential deposition of TiO2 and SiO2 mesoporous layers onto transparent conducting substrates are used to perform a systematic characterization of both the injection process at the electron selective contact and the scaffold effect in PSCs...
January 21, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27933162/photoexcited-state-properties-of-carbon-dots-from-thermally-induced-functionalization-of-carbon-nanoparticles
#8
Yin Hu, Mohamad M Al Awak, Fan Yang, Sijia Yan, Qingwu Xiong, Ping Wang, Yongan Tang, Liju Yang, Gregory E LeCroy, Xiaofang Hou, Christopher E Bunker, Linxi Xu, Nicholas Tomlinson, Ya-Ping Sun
Carbon dots are small carbon nanoparticles with various surface passivation schemes, in which more effective has been the deliberate chemical functionalization of the nanoparticles for brighter fluorescence emissions, though the synthesis method is more tedious and subject to some limitations in the selection of functionalization molecules. Another more popular synthesis method has been the carbonization of organic species, with the method being more efficient and versatile, but less controllable in the synthesis and for the desired dot structure and performance...
November 28, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28133537/enhanced-fluorescence-properties-of-carbon-dots-in-polymer-films
#9
Yamin Liu, Ping Wang, K A Shiral Fernando, Gregory E LeCroy, Halidan Maimaiti, Barbara A Harruff-Miller, William K Lewis, Christopher E Bunker, Zhi-Ling Hou, Ya-Ping Sun
Carbon dots of small carbon nanoparticles surface-functionalized with 2,2'-(ethylenedioxy)bis(ethylamine) (EDA) were synthesized, and the as-synthesized sample was separated on an aqueous gel column to obtain fractions of the EDA-carbon dots with different fluorescence quantum yields. As already discussed in the literature, the variations in fluorescence performance among the fractions were attributed to the different levels and/or effectiveness of the surface functionalization-passivation in the carbon dots...
August 7, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27774150/a-single-source-precursor-approach-to-solution-processed-indium-arsenide-thin-films
#10
Peter Marchand, Sanjayan Sathasivam, Benjamin A D Williamson, David Pugh, Salem M Bawaked, Sulaiman N Basahel, Abdullah Y Obaid, David O Scanlon, Ivan P Parkin, Claire J Carmalt
This paper reports the synthesis of the novel single-source precursor, [{(MeInAs t Bu)3 }2 (Me2 InAs( t Bu)H)2 ] and the subsequent first report of aerosol-assisted chemical vapour deposition of InAs thin films. Owing to the use of the single-source precursor, highly crystalline and stoichiometric films were grown at a relatively low deposition temperature of 450 °C. Core level XPS depth profiling studies showed some partial oxidation of the film surface, however this was self-limiting and disappeared on etch profiles...
July 28, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28496980/silver-induced-reconstruction-of-an-adeninate-based-metal-organic-framework-for-encapsulation-of-luminescent-adenine-stabilized-silver-clusters
#11
Dries Jonckheere, Eduardo Coutino-Gonzalez, Wouter Baekelant, Bart Bueken, Helge Reinsch, Ivo Stassen, Oliver Fenwick, Fanny Richard, Paolo Samorì, Rob Ameloot, Johan Hofkens, Maarten B J Roeffaers, Dirk E De Vos
Bright luminescent silver-adenine species were successfully stabilized in the pores of the MOF-69A (zinc biphenyldicarboxylate) metal-organic framework, starting from the intrinsically blue luminescent bio-MOF-1 (zinc adeninate 4,4'-biphenyldicarboxylate). Bio-MOF-1 is transformed to the MOF-69A framework by selectively leaching structural adenine linkers from the original framework using silver nitrate solutions in aqueous ethanol. Simultaneously, bright blue-green luminescent silver-adenine clusters are formed inside the pores of the recrystallized MOF-69A matrix in high local concentrations...
May 21, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27358738/a-novel-design-strategy-for-nanoparticles-on-nanopatterns-interferometric-lithographic-patterning-of-mms6-biotemplated-magnetic-nanoparticles
#12
S M Bird, O El-Zubir, A E Rawlings, G J Leggett, S S Staniland
Nanotechnology demands the synthesis of highly precise, functional materials, tailored for specific applications. One such example is bit patterned media. These high-density magnetic data-storage materials require specific and uniform magnetic nanoparticles (MNPs) to be patterned over large areas (cm2 range) in exact nanoscale arrays. However, the realisation of such materials for nanotechnology applications depends upon reproducible fabrication methods that are both precise and environmentally-friendly, for cost-effective scale-up...
May 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27358737/transition-metal-nitride-based-thin-films-as-novel-energy-harvesting-materials
#13
Per Eklund, Sit Kerdsongpanya, Björn Alling
The last few years have seen a rise in the interest in early transition-metal and rare-earth nitrides, primarily based on ScN and CrN, for energy harvesting by thermoelectricity and piezoelectricity. This is because of a number of important advances, among those the discoveries of exceptionally high piezoelectric coupling coefficient in (Sc,Al)N alloys and of high thermoelectric power factors of ScN-based and CrN-based thin films. These materials also constitute well-defined model systems for investigating thermodynamics of mixing for alloying and nanostructural design for optimization of phase stability and band structure...
May 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27398216/solubilised-bright-blue-emitting-iridium-complexes-for-solution-processed-oleds
#14
Adam F Henwood, Ashu K Bansal, David B Cordes, Alexandra M Z Slawin, Ifor D W Samuel, Eli Zysman-Colman
Combining a sterically bulky, electron-deficient 2-(2,4-difluorophenyl)-4-(2,4,6-trimethylphenyl)pyridine (dFMesppy) cyclometalating C∧ N ligand with an electron rich, highly rigidified 1,1'-(α,α'- o -xylylene)-2,2'-biimidazole ( o -xylbiim) N∧ N ligand gives an iridium complex, [Ir(dFMesppy)2 ( o -xylbiim)](PF6 ), that achieves extraordinarily bright blue emission ( Φ PL = 90%; λ max = 459 nm in MeCN) for a cationic iridium complex. This complex is compared with two reference complexes bearing 4,4'-di- tert -butyl-2,2'-bipyridine, and solution-processed organic light emitting diodes (OLEDs) have been fabricated from these materials...
May 7, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28603621/temperature-dependent-shape-responsive-fluorescent-nanospheres-for-image-guided-drug-delivery
#15
Shawn He, George Tourkakis, Oleg Berezin, Nikolay Gerasimchuk, Hairong Zhang, Haying Zhou, Asaf Izraely, Walter J Akers, Mikhail Y Berezin
Temperature-responsive nanoparticles used in conjunction with hyperthermia promise to provide synergistic effects for increasing drug efficacy. We propose a near-infared (NIR) fluorescent system based on a upper critical solution temperature (UCST) polymer, ISP2, integrated with a NIR fluorescent dye HITC for in vivo tracking. The system forms a nanoparticle that increases its volume as temperature increases, similar to the expansion of a Hoberman sphere. The nanospheres nearly doubled in size, from 80 nm to 140 nm, during a temperature increase from 40°C to 60°C...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28491320/push-pull-dioxaborine-as-fluorescent-molecular-rotor-far-red-fluorogenic-probe-for-ligand-receptor-interactions
#16
Iuliia A Karpenko, Yosuke Niko, Viktor P Yakubovskyi, Andriy O Gerasov, Dominique Bonnet, Yuriy P Kovtun, Andrey S Klymchenko
Fluorescent solvatochromic dyes and molecular rotors increase their popularity as fluorogenic probes for background-free detection of biomolecules in cellulo in no-wash conditions. Here, we introduce a push-pull boron-containing (dioxaborine) dye that presents unique spectroscopic behavior combining solvatochromism and molecular rotor properties. Indeed, in organic solvents, it shows strong red shifts in the absorption and fluorescence spectra upon increase in solvent polarity, typical for push-pull dyes. On the other hand, in polar solvents, where it probably undergoes Twisted Intramolecular Charge Transfer (TICT), the dye displays strong dependence of its quantum yield on solvent viscosity, in accordance to Förster-Hoffmann equation...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27127631/ratiometric-mechanosensitive-fluorescent-dyes-design-and-applications
#17
Mark A Haidekker, Emmanuel A Theodorakis
Fluorescent molecules, with their almost instantaneous response to external influences and relatively low-cost measurement instrumentation, have been attractive analytical tools and biosensors for centuries. More recently, advanced chemical synthesis and targeted design have accelerated the development of fluorescent probes. This article focuses on dyes with segmental mobility (known as fluorescent molecular rotors) that act as mechanosensors, which are known for their relationship of emission quantum yield with microviscosity...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27087967/using-membrane-composition-to-fine-tune-the-p-k-a-of-an-optical-liposome-ph-sensor
#18
Kasey J Clear, Katelyn Virga, Lawrence Gray, Bradley D Smith
Liposomes containing membrane-anchored pH-sensitive optical probes are valuable sensors for monitoring pH in various biomedical samples. The dynamic range of the sensor is maximized when the probe p K a is close to the expected sample pH. While some biomedical samples are close to neutral pH there are several circumstances where the pH is 1 or 2 units lower. Thus, there is a need to fine-tune the probe p K a in a predictable way. This investigation examined two lipid-conjugated optical probes, each with appended deep-red cyanine dyes containing indoline nitrogen atoms that are protonated in acid...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27042309/subcellular-behaviour-evaluation-of-nanopharmaceuticals-with-aggregation-induced-emission-molecules
#19
Xiangdong Xue, Jing Xu, Paul C Wang, Xing-Jie Liang
Nanopharmaceuticals possess a myriad of advantages for disease treatment, not only in delivering therapeutic agents, but also in deciphering their innate intracellular or subcellular behaviours, providing detailed diagnostic and prognostic information, quantifying treatment efficacy and designing better therapeutics. To evaluate the subcellular behaviour of nanopharmaceuticals, colourful fluorescence is the most potential technique, because it is capable of painting the subcellular detail in three dimensions with high resolution...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27774151/the-impact-of-charge-transfer-and-structural-disorder-on-the-thermoelectric-properties-of-cobalt-intercalated-tis-2
#20
Gabin Guélou, Paz Vaqueiro, Jesús Prado-Gonjal, Tristan Barbier, Sylvie Hébert, Emmanuel Guilmeau, Winfried Kockelmann, Anthony V Powell
A family of phases, Co x TiS2 (0 ≤ x ≤ 0.75) has been prepared and characterised by powder X-ray and neutron diffraction, electrical and thermal transport property measurements, thermal analysis and SQUID magnetometry. With increasing cobalt content, the structure evolves from a disordered arrangement of cobalt ions in octahedral sites located in the van der Waals' gap ( x ≤ 0.2), through three different ordered vacancy phases, to a second disordered phase at x ≥ 0.67. Powder neutron diffraction reveals that both octahedral and tetrahedral inter-layer sites are occupied in Co0...
March 7, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
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