ORCID Profile
0000-0002-2919-6962
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Publisher: Springer International Publishing
Date: 10-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2CS00053A
Abstract: CO 2 -responsive gels respond to CO 2 exposure by either changing their properties or by switching between gel and non-gel states.
Publisher: American Chemical Society (ACS)
Date: 12-2021
Abstract: Two new smectic C* mesogens containing a hexyloxy side chain and an azafluorenone (
Publisher: Springer Science and Business Media LLC
Date: 23-10-2018
DOI: 10.1038/S41528-018-0038-9
Abstract: Controlling the orientation of the emissive dipole has led to a renaissance of organic light-emitting diode (OLED) research, with external quantum efficiencies (EQEs) of % being reported for phosphorescent emitters. These highly efficient OLEDs are generally manufactured using evaporative methods and are comprised of small-molecule heteroleptic phosphorescent iridium(III) complexes blended with a host and additional layers to balance charge injection and transport. Large area OLEDs for lighting and display applications would benefit from low-cost solution processing, provided that high EQEs could be achieved. Here, we show that poly(dendrimer)s consisting of a non-conjugated polymer backbone with iridium(III) complexes forming the cores of first-generation dendrimer side chains can be co-deposited with a host by solution processing to give highly efficient devices. Simple bilayer devices comprising the emissive layer and an electron transport layer gave an EQE of % at luminances of up to ≈300 cd/m 2 , showing that polymer engineering can enable alignment of the emissive dipole of solution-processed phosphorescent materials.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TC30472H
Publisher: Springer Science and Business Media LLC
Date: 27-02-2015
DOI: 10.1038/NCOMMS7343
Abstract: Spectrally selective light detection is vital for full-colour and near-infrared (NIR) imaging and machine vision. This is not possible with traditional broadband-absorbing inorganic semiconductors without input filtering, and is yet to be achieved for narrowband absorbing organic semiconductors. We demonstrate the first sub-100 nm full-width-at-half-maximum visible-blind red and NIR photodetectors with state-of-the-art performance across critical response metrics. These devices are based on organic photodiodes with optically thick junctions. Paradoxically, we use broadband-absorbing organic semiconductors and utilize the electro-optical properties of the junction to create the narrowest NIR-band photoresponses yet demonstrated. In this context, these photodiodes outperform the encumbent technology (input filtered inorganic semiconductor diodes) and emerging technologies such as narrow absorber organic semiconductors or quantum nanocrystals. The design concept allows for response tuning and is generic for other spectral windows. Furthermore, it is material-agnostic and applicable to other disordered and polycrystalline semiconductors.
Publisher: Wiley
Date: 30-07-2010
Publisher: AIP Publishing
Date: 21-06-2010
DOI: 10.1063/1.3456374
Abstract: Color information is much less useful to machine vision systems than to people because the spectrum of light illuminating a scene is unknown. For scenes illuminated by daylight, color information can be made significantly more useful to machine vision systems if the scene is imaged using sensors with a specifically chosen combination of spectral responses. In this paper we show that detectors with a full width at half maximum of up to 100 nm can give good color discrimination, and that conjugated dendrimer chromophores have the spectral properties required to allow machine vision systems to confidently use color information.
Publisher: Wiley
Date: 25-04-2016
Abstract: Major growth in the image sensor market is largely as a result of the expansion of digital imaging into cameras, whether stand-alone or integrated within smart cellular phones or automotive vehicles. Applications in biomedicine, education, environmental monitoring, optical communications, pharmaceutics and machine vision are also driving the development of imaging technologies. Organic photodiodes (OPDs) are now being investigated for existing imaging technologies, as their properties make them interesting candidates for these applications. OPDs offer cheaper processing methods, devices that are light, flexible and compatible with large (or small) areas, and the ability to tune the photophysical and optoelectronic properties - both at a material and device level. Although the concept of OPDs has been around for some time, it is only relatively recently that significant progress has been made, with their performance now reaching the point that they are beginning to rival their inorganic counterparts in a number of performance criteria including the linear dynamic range, detectivity, and color selectivity. This review covers the progress made in the OPD field, describing their development as well as the challenges and opportunities.
Publisher: American Chemical Society (ACS)
Date: 05-03-2021
Publisher: American Chemical Society (ACS)
Date: 22-01-2018
Abstract: Organic light-emitting devices containing solution-processed emissive dendrimers can be highly efficient. The most efficient devices contain a blend of the light-emitting dendrimer in a host and one or more charge-transporting layers. Using neutron reflectometry measurements with in situ photoluminescence, we have investigated the structure of the as-formed film as well as the changes in film structure and dendrimer emission under thermal stress. It was found that the as-formed film stacks comprising poly(3,4-ethylenedioxythiophene):polystyrene sulfonate/host:dendrimer/1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (where the host was deuterated 4,4'-N,N'-di(carbazolyl)biphenyl or tris(4-carbazol-9-ylphenyl)amine, the host:dendrimer layer was solution-processed, and the 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene evaporated) had well-defined interfaces, indicating good wetting of each of the layers by the subsequently deposited layer. Upon thermal annealing, there was no change in the poly(3,4-ethylenedioxythiophene):polystyrene sulfonate/host:dendrimer interface, but once the temperature reached above the T
Publisher: American Chemical Society (ACS)
Date: 22-06-2022
Publisher: American Chemical Society (ACS)
Date: 25-06-2021
Publisher: Wiley
Date: 24-03-2022
DOI: 10.1002/JLCR.3969
Abstract: Baricitinib, typically applied as a treatment for rheumatoid arthritis, has recently attracted the attention of clinicians and researchers as a potential treatment for COVID‐19. Naturally, there has been a need for the preparation of the isotope‐labelled analogue of baricitinib to probe the pharmacokinetics of baricitinib in this new role. As such, we have developed a simple synthetic route to deuterated [ 2 H 5 ]baricitinib, facilitating its formation over four steps and in a 29% overall yield based on starting [ 2 H 5 ]ethanethiol (19% if we start with [ 2 H 5 ]bromoethane instead). A critical component of the overall process involves the synthesis of [ 2 H 5 ]ethanesulfonyl chloride, and we describe in detail the two routes that were explored to optimize this step.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-05-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 31-07-2014
DOI: 10.1039/C4TC90093F
Publisher: SPIE
Date: 19-08-2010
DOI: 10.1117/12.867735
Publisher: American Chemical Society (ACS)
Date: 24-07-2013
DOI: 10.1021/ED3006105
Publisher: American Chemical Society (ACS)
Date: 13-11-2022
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 02-2014
No related grants have been discovered for Ross Jansen-van Vuuren.