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https://www.readbyqxmd.com/read/28902157/triarylborane-based-materials-for-oled-applications
#1
REVIEW
Gulsen Turkoglu, M Emin Cinar, Turan Ozturk
Multidisciplinary research on organic fluorescent molecules has been attracting great interest owing to their potential applications in biomedical and material sciences. In recent years, electron deficient systems have been increasingly incorporated into fluorescent materials. Triarylboranes with the empty p orbital of their boron centres are electron deficient and can be used as strong electron acceptors in conjugated organic fluorescent materials. Moreover, their applications in optoelectronic devices, energy harvesting materials and anion sensing, due to their natural Lewis acidity and remarkable solid-state fluorescence properties, have also been investigated...
September 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28895105/1-3-diphenylisobenzofuran-a-model-chromophore-for-singlet-fission
#2
REVIEW
Justin C Johnson, Josef Michl
In this review we first provide an introductory description of the singlet fission phenomenon and then describe the ground and electronically excited states of the parent 1,3-diphenylisobenzofuran chromophore (1) and about a dozen of its derivatives. A discussion of singlet fission in thin polycrystalline layers of these materials follows. The highest quantum yield of triplet formation by singlet fission, 200% at 80 K, is found in one of the two known crystal modification of the parent. In the other modification and in many derivatives, excimer formation competes successfully and triplet yields are low...
September 11, 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28829477/upconversion-processes-versatile-biological-applications-and-biosafety
#3
REVIEW
Arif Gulzar, Jiating Xu, Piaoping Yang, Fei He, Liangge Xu
Lanthanide-doped photon upconverting nanomaterials are evolving as a new class of imaging contrast agents, offering highly promising prospects in the area of biomedical applications. Owing to their ability to convert long-wavelength near-infrared excitation radiation into shorter-wavelength emissions, these nanomaterials are well suited to yield properties of low imaging background, large anti-Stokes shift, along with high optical penetration depth of NIR light for deep tissue optical imaging or light-activated drug release and therapy...
August 31, 2017: Nanoscale
https://www.readbyqxmd.com/read/28814860/quantum-dots-in-imaging-drug-delivery-and-sensor-applications
#4
REVIEW
Cristian T Matea, Teodora Mocan, Flaviu Tabaran, Teodora Pop, Ofelia Mosteanu, Cosmin Puia, Cornel Iancu, Lucian Mocan
Quantum dots (QDs), also known as nanoscale semiconductor crystals, are nanoparticles with unique optical and electronic properties such as bright and intensive fluorescence. Since most conventional organic label dyes do not offer the near-infrared (>650 nm) emission possibility, QDs, with their tunable optical properties, have gained a lot of interest. They possess characteristics such as good chemical and photo-stability, high quantum yield and size-tunable light emission. Different types of QDs can be excited with the same light wavelength, and their narrow emission bands can be detected simultaneously for multiple assays...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28802828/photolyase-dynamics-and-electron-transfer-mechanisms-of-dna-repair
#5
REVIEW
Meng Zhang, Lijuan Wang, Dongping Zhong
Photolyase, a flavoenzyme containing flavin adenine dinucleotide (FAD) molecule as a catalytic cofactor, repairs UV-induced DNA damage of cyclobutane pyrimidine dimer (CPD) and pyrimidine-pyrimidone (6-4) photoproduct using blue light. The FAD cofactor, conserved in the whole protein superfamily of photolyase/cryptochromes, adopts a unique folded configuration at the active site that plays a critical functional role in DNA repair. Here, we review our comprehensive characterization of the dynamics of flavin cofactor and its repair photocycles by different classes of photolyases on the most fundamental level...
August 9, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28762723/single-molecule-plasmon-sensing-current-status-and-future-prospects
#6
Adam B Taylor, Peter Zijlstra
Single-molecule detection has long relied on fluorescent labeling with high quantum-yield fluorophores. Plasmon-enhanced detection circumvents the need for labeling by allowing direct optical detection of weakly emitting and completely nonfluorescent species. This review focuses on recent advances in single molecule detection using plasmonic metal nanostructures as a sensing platform, particularly using a single particle-single molecule approach. In the past decade two mechanisms for plasmon-enhanced single-molecule detection have been demonstrated: (1) by plasmonically enhancing the emission of weakly fluorescent biomolecules, or (2) by monitoring shifts of the plasmon resonance induced by single-molecule interactions...
August 25, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28745302/advanced-carbon-nanotubes-functionalization
#7
A Setaro
Similar to graphene, carbon nanotubes are materials made of pure carbon in its sp(2) form. Their extended conjugated π-network provides them with remarkable quantum optoelectronic properties. Frustratingly, it also brings drawbacks. The π-π stacking interaction makes as-produced tubes bundle together, blurring all their quantum properties. Functionalization aims at modifying and protecting the tubes while hindering π-π stacking. Several functionalization strategies have been developed to circumvent this limitation in order for nanotubes applications to thrive...
July 26, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28492303/a-unique-integration-strategy-for-the-rational-design-of-optically-tunable-near-infrared-fluorophores
#8
Hua Chen, Baoli Dong, Yonghe Tang, Weiying Lin
Fluorescence imaging is a rapidly growing technique for noninvasive imaging of biological molecules and processes with high spatial and temporal resolution. For effective biological imaging, it is essential and important to develop robust fluorescent dyes, in particular, near-infrared (NIR) fluorescent dyes with favorable optical properties. Compared with the visible light emitting dyes, NIR dyes have relatively longer emission wavelengths (650-900 nm) with lower energy and are advantageous as imaging agents owing to the minimum photodamage of NIR light to biological samples, deep penetration into tissues, and low interference from autofluorescence of biomolecules...
May 11, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28433535/bioimaging-and-biodetection-assisted-with-tta-uc-materials
#9
REVIEW
Qingqing Dou, Lu Jiang, Dan Kai, Cally Owh, Xian Jun Loh
Upconversion of light has attracted intensive studies for biomedical research, because it enables deeper tissue analysis owing to the longer wavelength of incident light, compared with conventional downconversion fluorescent materials. Triplet-triplet annihilation (TTA), as a typical mechanism of upconversion, does not necessitate high power excitation and exhibits a higher quantum yield than rare earth upconversion owing to more sensitizer options with higher absorption coefficients. A desirable wavelength range of excitation and emission can be realized by careful selection of the combination of sensitizer and activator...
April 19, 2017: Drug Discovery Today
https://www.readbyqxmd.com/read/28422093/quantum-enhanced-inference-in-markov-logic-networks
#10
Peter Wittek, Christian Gogolin
Markov logic networks (MLNs) reconcile two opposing schools in machine learning and artificial intelligence: causal networks, which account for uncertainty extremely well, and first-order logic, which allows for formal deduction. An MLN is essentially a first-order logic template to generate Markov networks. Inference in MLNs is probabilistic and it is often performed by approximate methods such as Markov chain Monte Carlo (MCMC) Gibbs sampling. An MLN has many regular, symmetric structures that can be exploited at both first-order level and in the generated Markov network...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28398449/photonics-and-spectroscopy-in-nanojunctions-a-theoretical-insight
#11
REVIEW
Michael Galperin
The progress of experimental techniques at the nanoscale in the last decade made optical measurements in current-carrying nanojunctions a reality, thus indicating the emergence of a new field of research coined optoelectronics. Optical spectroscopy of open nonequilibrium systems is a natural meeting point for (at least) two research areas: nonlinear optical spectroscopy and quantum transport, each with its own theoretical toolbox. We review recent progress in the field comparing theoretical treatments of optical response in nanojunctions as is accepted in nonlinear spectroscopy and quantum transport communities...
April 11, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28295673/808-nm-light-excited-lanthanide-doped-nanoparticles-rational-design-luminescence-control-and-theranostic-applications
#12
REVIEW
Bei Liu, Chunxia Li, Piaoping Yang, Zhiyao Hou, Jun Lin
808 nm-light-excited lanthanide (Ln(3+) )-doped nanoparticles (LnNPs) hold great promise for a wide range of applications, including bioimaging diagnosis and anticancer therapy. This is due to their unique properties, including their minimized overheating effect, improved penetration depth, relatively high quantum yields, and other common features of LnNPs. In this review, the progress of 808 nm-excited LnNPs is reported, including their i) luminescence mechanism, ii) luminescence enhancement, iii) color tuning, iv) diagnostic and v) therapeutic applications...
May 2017: Advanced Materials
https://www.readbyqxmd.com/read/28251268/cadmium-containing-quantum-dots-properties-applications-and-toxicity
#13
REVIEW
Dan Mo, Liang Hu, Guangming Zeng, Guiqiu Chen, Jia Wan, Zhigang Yu, Zhenzhen Huang, Kai He, Chen Zhang, Min Cheng
The marriage of biology with nanomaterials has significantly accelerated advancement of biological techniques, profoundly facilitating practical applications in biomedical fields. With unique optical properties (e.g., tunable broad excitation, narrow emission spectra, robust photostability, and high quantum yield), fluorescent quantum dots (QDs) have been reasonably functionalized with controllable interfaces and extensively used as a new class of optical probe in biological researches. In this review, we summarize the recent progress in synthesis and properties of QDs...
April 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28240879/lanthanide-activated-phosphors-based-on-4f-5d-optical-transitions-theoretical-and-experimental-aspects
#14
Xian Qin, Xiaowang Liu, Wei Huang, Marco Bettinelli, Xiaogang Liu
The synthesis of lanthanide-activated phosphors is pertinent to many emerging applications, ranging from high-resolution luminescence imaging to next-generation volumetric full-color display. In particular, the optical processes governed by the 4f-5d transitions of divalent and trivalent lanthanides have been the key to enabling precisely tuned color emission. The fundamental importance of lanthanide-activated phosphors for the physical and biomedical sciences has led to rapid development of novel synthetic methodologies and relevant tools that allow for probing the dynamics of energy transfer processes...
March 8, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28212121/identification-and-evaluation-of-clinically-significant-prostate-cancer-a-step-towards-personalized-diagnosis
#15
Adnan Ali, Alexander Hoyle, Esther Baena, Noel W Clarke
PURPOSE OF REVIEW: Prostate cancer (PCa) diagnostics are evolving rapidly. The quest to differentiate 'clinically significant' from 'clinically insignificant' disease has gathered momentum, leading to substantial change in traditional diagnostic approaches. Herein, we review the relevant information on currently available biomarkers and assess their ability to help physicians and patients in making a shared and personalized decision based on their individual risk of harbouring clinically significant disease...
May 2017: Current Opinion in Urology
https://www.readbyqxmd.com/read/28205400/design-features-for-optimization-of-tetrapyrrole-macrocycles-as-antimicrobial-and-anticancer-photosensitizers
#16
REVIEW
Alejandra Martinez De Pinillos Bayona, Pawel Mroz, Connor Thunshelle, Michael R Hamblin
Photodynamic therapy (PDT) uses non-toxic dyes called photosensitizers (PS) and harmless visible light that combine to form highly toxic reactive oxygen species that kill cells. Originally, a cancer therapy, PDT, now includes applications for infections. The most widely studied PS are tetrapyrrole macrocycles including porphyrins, chlorins, bacteriochlorins, and phthalocyanines. The present review covers the design features in PS that can work together to maximize the PDT activity for various disease targets...
February 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28165167/slow-photons-for-photocatalysis-and-photovoltaics
#17
REVIEW
Jing Liu, Heng Zhao, Min Wu, Benoit Van der Schueren, Yu Li, Olivier Deparis, Jinhua Ye, Geoffrey A Ozin, Tawfique Hasan, Bao-Lian Su
Solar light is widely recognized as one of the most valuable renewable energy sources for the future. However, the development of solar-energy technologies is severely hindered by poor energy-conversion efficiencies due to low optical-absorption coefficients and low quantum-conversion yield of current-generation materials. Huge efforts have been devoted to investigating new strategies to improve the utilization of solar energy. Different chemical and physical strategies have been used to extend the spectral range or increase the conversion efficiency of materials, leading to very promising results...
May 2017: Advanced Materials
https://www.readbyqxmd.com/read/28067991/all-inorganic-halide-perovskites-nanosystem-synthesis-structural-features-optical-properties-and-optoelectronic-applications
#18
Xiaoming Li, Fei Cao, Dejian Yu, Jun Chen, Zhiguo Sun, Yalong Shen, Ying Zhu, Lin Wang, Yi Wei, Ye Wu, Haibo Zeng
The recent success of organometallic halide perovskites (OHPs) in photovoltaic devices has triggered lots of corresponding research and many perovskite analogues have been developed to look for devices with comparable performance but better stability. Upon the preparation of all inorganic halide perovskite nanocrystals (IHP NCs), research activities have soared due to their better stability, ultrahigh photoluminescence quantum yield (PL QY), and composition dependent luminescence covering the whole visible region with narrow line-width...
January 9, 2017: Small
https://www.readbyqxmd.com/read/27992172/emissive-molecular-aggregates-and-energy-migration-in-luminescent-solar-concentrators
#19
James L Banal, Bolong Zhang, David J Jones, Kenneth P Ghiggino, Wallace W H Wong
Luminescent solar concentrators (LSCs) are light harvesting devices that are ideally suited to light collection in the urban environment where direct sunlight is often not available. LSCs consist of highly luminescent compounds embedded or coated on a transparent substrate that absorb diffuse or direct solar radiation over a large area. The resulting luminescence is trapped in the waveguide by total internal reflection to the thin edges of the substrate where the concentrated light can be used to improve the performance of photovoltaic devices...
December 19, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27968720/fluorescence-detection-of-pesticides-using-quantum-dot-materials-a-review
#20
REVIEW
S A Nsibande, P B C Forbes
High pesticide use, especially in agriculture, can lead to environmental pollution and potentially adverse health effects. As result, pesticide residues end up in different media, including water and food products, which may serve as direct routes for human exposure. There is thus a continuous drive to develop analytical methods for screening and quantification of these compounds in the different environmental media in which they may occur. Development of quantum dot (QD) based sensors for monitoring pesticides has gained momentum in recent years...
November 16, 2016: Analytica Chimica Acta
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