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

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https://read.qxmd.com/read/30713694/electronic-transport-in-cdse-nanoplatelet-based-polymer-fibres
#1
Jan F Miethe, Anja Schlosser, J Gerrit Eckert, Franziska Lübkemann, Nadja C Bigall
One of the most significant objectives in the field of nanotechnology is the transfer of specific properties of smaller nanoparticle building blocks into larger units. In this way, nanoscopic properties can be linked to the macroscopic addressability of larger systems. Such systems might find applications in fields like photoelectrochemical sensing or solar energy harvesting. Our work reports on the novel synthesis of hybrid semiconductor/polymer fibres, which are based on stacks of 4 monolayer (ML) thick CdSe nanoplatelets (NPLs) encapsulated into a polymer shell...
October 28, 2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/30294446/controlling-excimer-formation-in-indolo-3-2-1-jk-carbazole-9-h-carbazole-based-host-materials-for-rgb-pholeds
#2
Chenyang Zhao, Thomas Schwartz, Berthold Stöger, Fraser J White, Jiangshan Chen, Dongge Ma, Johannes Fröhlich, Paul Kautny
Three novel materials ( 5CzICz , Cz2 ICz and Cz3 ICz ), based on the indolo[3,2,1- jk ]carbazole and 9 H -carbazole building blocks, with high triplet energies ( E T > 2.80 eV) and good thermal stability ( T g > 101 °C) were synthesized, characterized and applied as host materials in PhOLED devices. In course of the preparation of the materials, an improved protocol for the synthesis of the indolo[3,2,1- jk ]carbazole moiety has been developed. The careful molecular design of the title compounds allowed to avoid excimer formation of the indolo[3,2,1- jk ]carbazole subunits in thin films...
October 7, 2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/30713693/three-birds-one-stone-photo-piezo-chemochromism-in-one-conjugated-nanoporous-ionic-organic-network
#3
Jian-Ke Sun, Ya-Jun Zhang, Gui-Peng Yu, Jie Zhang, Markus Antonietti, Jiayin Yuan
A nanoporous material bearing a high ion density and inherent organic radical character was synthesized by a facile one-pot process, which exhibits photo-, piezo- and chemochromism, driven by the diverse electron transfer processes between the acceptor framework and different electron donors. The responsive behavior is useful for its sensing application, as demonstrated here for pressure, anion and gas sensing.
September 14, 2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/30713692/new-red-emitting-schiff-base-chelates-promising-dyes-for-sensing-and-imaging-of-temperature-and-oxygen-via-phosphorescence-decay-time
#4
Sergey M Borisov, Reinhold Pommer, Jan Svec, Sven Peters, Veronika Novakova, Ingo Klimant
New complexes of Zn(ii), Pd(ii) and Pt(ii) with Schiff bases are prepared in a one-step condensation of 4-(dibutylamino)-2-hydroxybenzaldehyde and 4,5-diaminophthalonitrile in the presence of a metal salt. The complexes possess efficient absorption in the blue-green part of the spectrum with molar absorption coefficients up to 98 000 M-1 cm-1 . The Pt(ii) complex shows very strong red phosphorescence in anoxic solutions at room temperature with a quantum yield of 65% in toluene which places it among the brightest emitters available for this spectral range...
September 7, 2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/30713691/efficient-perovskite-light-emitting-diodes-based-on-a-solution-processed-tin-dioxide-electron-transport-layer
#5
Heyong Wang, Hongling Yu, Weidong Xu, Zhongcheng Yuan, Zhibo Yan, Chuanfei Wang, Xianjie Liu, Mats Fahlman, Jun-Ming Liu, Xiao-Ke Liu, Feng Gao
To achieve high-performance perovskite light-emitting diodes (PeLEDs), an appropriate functional layer beneath the perovskite emissive layer is significantly important to modulate the morphology of the perovskite film and to facilitate charge injection and transport in the device. Herein, for the first time, we report efficient n-i-p structured PeLEDs using solution-processed SnO2 as an electron transport layer. Three-dimensional perovskites, such as CH(NH2 )2 PbI3 and CH3 NH3 PbI3 , are found to be more chemically compatible with SnO2 than with commonly used ZnO...
July 14, 2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/30713690/highly-stable-doping-of-a-polar-polythiophene-through-co-processing-with-sulfonic-acids-and-bistriflimide
#6
Anna I Hofmann, Renee Kroon, Liyang Yu, Christian Müller
Doping of organic semiconductors is currently an intensely studied field, since it is a powerful tool to optimize the performance of various organic electronic devices, ranging from organic solar cells, to thermoelectric modules, and bio-medical sensors. Despite recent advances, there is still a need for the development of highly conducting polymer:dopant systems with excellent long term stability and a high resistance to elevated temperatures. In this work we study the doping of the polar polythiophene derivative p(g4 2T-T) by various sulfonic acids and bistriflimide via different processing techniques...
July 14, 2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/30009028/cation-magnetic-and-charge-ordering-in-mnfe-3-o-5
#7
K H Hong, A M Arevalo-Lopez, M Coduri, G M McNally, J P Attfield
The recently-discovered high pressure material MnFe3 O5 displays a rich variety of magnetically ordered states on cooling. Fe spins order antiferromagnetically below a Néel transition at 350 K. A second transition at 150 K marks Mn spin order that leads to spin canting of some of the Fe spins and ferrimagnetism. A further transition at 60 K is driven by charge ordering of Fe2+ and Fe3+ over two inequivalent Fe sites, with further canting of all spins. Electrical resistivity measurements reveal semiconducting behaviour in MnFe3 O5 with a change in activation energy at 285 K...
April 7, 2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/29430302/impact-of-the-synthesis-method-on-the-solid-state-charge-transport-of-radical-polymers
#8
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://read.qxmd.com/read/30505447/yb-3-and-yb-3-er-3-doping-for-near-infrared-emission-and-improved-stability-of-cspbcl-3-nanocrystals
#9
Xiangtong Zhang, Yu Zhang, Xiaoyu Zhang, Wenxu Yin, Yu Wang, Hua Wang, Min Lu, Zhiyang Li, Zhiyong Gu, William W Yu
Lead halide perovskite nanocrystals (NCs) exhibit excellent tunable emissions covering the entire visible spectral region, but they do not emit near-infrared (NIR) light. We synthesized rare earth element doped CsPbCl3 NCs for NIR emission. The Yb3+ doped CsPbCl3 NCs emitted strong 986 nm NIR light; the Yb3+ /Er3+ co-doped CsPbCl3 NCs emitted at 1533 nm. The total photoluminescence quantum yield (PL QY) of the CsPbCl3 NCs changed from 5.0% to 127.8% upon incorporating 2.0% Yb3+ , a factor of 25.6 times enhancement...
2018: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/29308205/fluoride-sulfophosphate-glasses-as-hosts-for-broadband-optical-amplification-through-transition-metal-activators
#10
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://read.qxmd.com/read/29308204/increasing-the-horizontal-orientation-of-transition-dipole-moments-in-solution-processed-small-molecular-emitters
#11
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://read.qxmd.com/read/29599983/patterning-and-fluorescence-tuning-of-quantum-dots-with-haptic-interfaced-bubble-printing
#12
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://read.qxmd.com/read/29057077/the-impact-of-aggregation-on-the-p-doping-kinetics-of-poly-3-hexylthiophene
#13
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://read.qxmd.com/read/30009027/red-green-blue-emissive-lead-sulfide-quantum-dots-heterogeneous-synthesis-and-applications
#14
Bo Hou, Yuljae Cho, Byung-Sung Kim, Docheon Ahn, Sanghyo Lee, Jong Bae Park, Young-Woo Lee, John Hong, Hyunsik Im, Stephen M Morris, Jung Inn Sohn, SeungNam Cha, Jong Min Kim
Visible emission colloidal quantum dots (QDs) have shown promise in optical and optoelectronic applications. These QDs are typically composed of relatively expensive elements in the form of indium, cadmium, and gallium since alternative candidate materials exhibiting similar properties are yet to be realized. Herein, for the first time, we report red green blue (RGB) photoluminescences with quantum yields of 18% from earth-abundant lead sulfide (PbS) QDs. The visible emissive property is mainly attributed to a high degree of crystallinity even for the extremely small QD sizes (1-3 nm), which is realized by employing a heterogeneous reaction methodology at high growth temperatures (>170 °C)...
April 21, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://read.qxmd.com/read/28515937/dicyano-and-tetracyanopentacene-foundation-of-an-intriguing-new-class-of-easy-to-synthesize-organic-semiconductors
#15
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://read.qxmd.com/read/28496981/electron-injection-and-scaffold-effects-in-perovskite-solar-cells
#16
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://read.qxmd.com/read/27933162/photoexcited-state-properties-of-carbon-dots-from-thermally-induced-functionalization-of-carbon-nanoparticles
#17
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://read.qxmd.com/read/28133537/enhanced-fluorescence-properties-of-carbon-dots-in-polymer-films
#18
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://read.qxmd.com/read/27774150/a-single-source-precursor-approach-to-solution-processed-indium-arsenide-thin-films
#19
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://read.qxmd.com/read/28496980/silver-induced-reconstruction-of-an-adeninate-based-metal-organic-framework-for-encapsulation-of-luminescent-adenine-stabilized-silver-clusters
#20
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
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