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Red dot

Ke Ding, Hongting Chen, Lianwei Fan, Bo Wang, Zhi Huang, Shaoqing Zhuang, Bin Hu, Lei Wang
Quantum dot light emitting diode (QLED) with an inverted architecture always suffers charge injection imbalance and severe quantum dot charging, which degrades device performance. Blocking excess injected electrons into quantum dots (QDs) is crucial for efficient inverted QLEDs. It is found that Polyethylenimine (PEI) has two opposite effect on electron injection, one is blocking electron injection by its intrinsic insulativity and the other one is promoting electron injection by the reduced work function of ZnO/PEI...
May 19, 2017: ACS Applied Materials & Interfaces
Cui Liu, Dianhua Ning, Cheng Zhang, Zhengjie Liu, Ruilong Zhang, Jun Zhao, Tingting Zhao, Bianhua Liu, Zhongping Zhang
Classical pH test papers are widely employed to measure the acid-base degree of media in a qualitative and semi-quantitative way. However, the extension of the portable and inexpensive methods to a wide range of analytes so as to liberate us from the tediousness of instrumental assays remains unsuccessful. Here, we report a novel kind of dual-colored carbon dots (CDs) ratiometric-fluorescent test paper for the semi-quantitative assay of copper ions (Cu2+) by a dosage-sensitive color evolution. The creation of the test paper is based on the two interesting findings: on the one hand, the residual p-phenylenediamine (p-PDA) at the surface of as-synthesized red-emissive CDs (r-CDs) efficiently binds Cu2+ ions to produce a strong visible absorption that overlaps with the emission of blue CDs (b-CDs), on the other hand, Cu2+ ions render small b-CDs adsorbed onto the surface of larger-sized r-CDs through its dual-coordinating interactions with the surface ligands of both r-CDs and b-CDs...
May 18, 2017: ACS Applied Materials & Interfaces
Han Soo Yoo, Eunjeong Park, Soolienah Rhiu, Hyuk-Jae Chang, Kyoungsub Kim, Joonsang Yoo, Ji Hoe Heo, Hyo Suk Nam
BACKGROUND: Accurate evaluation of diplopia during bedside physical examination is challenging. We developed a new computerized red glass test (CRT) to detect, localize, and quantify diplopia and investigated whether the CRT is useful and feasible. METHODS: During the CRT, a white dot randomly appears on a monitor. Because a red glass is applied on the right eye, a patient can see one white dot and one red dot when diplopia is present. We defined the degree of diplopia as the direct distance of the two points with the largest deviation and compared the degree with the Hess score and Hess area ratio...
May 17, 2017: BMC Ophthalmology
Jiangling He, Youling He, Yonghao Chen, Bingfu Lei, Jianle Zhuang, Yong Xiao, Yeru Liang, Mingtao Zheng, Haoran Zhang, Yingliang Liu
Stable solid-state red fluorescence from organosilane-functionalized carbon dots (CDs) with sizes around 3 nm is reported for the first time. Meanwhile, a novel method is also first reported for the efficient construction of dual-fluorescence morphologies. The quantum yield of these solid-state CDs and their aqueous solution is 9.60 and 50.7%, respectively. The fluorescence lifetime is 4.82 ns for solid-state CDs, and 15.57 ns for their aqueous solution. These CDs are detailedly studied how they can exhibit obvious photoluminescence overcoming the self-quenching in solid state...
May 17, 2017: Small
Guoying Bai, Zhiping Song, Hongya Geng, Dong Gao, Kai Liu, Shuwang Wu, Wei Rao, Liangqia Guo, Jianjun Wang
Antifreeze proteins (AFPs), a type of high-efficiency but expensive and often unstable biological antifreeze, have stimulated substantial interest in the search for synthetic mimics. However, only a few reported AFP mimics display thermal hysteresis, and general criteria for the design of AFP mimics remain unknown. Herein, oxidized quasi-carbon nitride quantum dots (OQCNs) are synthesized through an up-scalable bottom-up approach. They exhibit thermal-hysteresis activity, an ice-crystal shaping effect, and activity on ice-recrystallization inhibition...
May 17, 2017: Advanced Materials
Hiroshi Sugimoto, Yusuke Ozaki, Minoru Fujii
We report strong enhancements of the effective absorption cross-section and photoluminescence (PL) intensity of silicon quantum dots (Si QDs) with 2.8-6.8 nm in diameter in a highly scattering dielectric medium. The scattering medium is a polymer thin film with submicron size pores inside, supporting the resonant cavity modes in the visible range. By the scattering associated with the cavity modes, efficient light trapping into a polymer film with ~1 µm in thickness is achieved, which leads to 30-40 times enhancement of the effective absorption cross-section of embedded Si QDs in a green-red wavelength range...
May 17, 2017: ACS Applied Materials & Interfaces
Xiang Miao, Xinlong Yan, Dan Qu, Dabing Li, Franklin Feng Tao, Zaicheng Sun
It is highly desirable and great challenge for red light emission carbon dots under long wavelength excitation. Here, we developed a facile route to synthesize carbon dots with red emission due to the doping effect of S and N elements borrowing from the concept of semiconductor. The maximum emission locates at 594 nm under 560 nm excitation. The absolute photoluminescence (PL) quantum yield (QY) is as high as 29% and 22% in ethanol and water, respectively. FTIR and XPS clearly illustrated the presence of -SCN, and -COOH groups, which endow with high sensitivity for ion detection of Fe3+...
May 16, 2017: ACS Applied Materials & Interfaces
Chun-Ting Kuo, Hong-Shang Peng, Yu Rong, Jiangbo Yu, Wei Sun, Bryant S Fujimoto, Daniel T Chiu
Multiplexed optical encoding is emerging as a powerful technique for high-throughput cellular analysis and molecular assays. Most of the developed optical barcodes, however, either suffer from large particle size or are incompatible with most commercial optical instruments. Here, a new type of nanoscale fluorescent barcodes (Pdot barcodes) was prepared from semiconducting polymers. The Pdot barcodes possess the merits of small size (~20 nm in diameter), narrow emission bands (FWHM of 30-40 nm), three-color emissions (blue, green, and red) under single-wavelength excitation, a high brightness, good pH and thermal stability, and efficient cellular uptake...
May 12, 2017: Analytical Chemistry
Ting Xu, Qiang Zhang, Ya-Han Fan, Ru-Qing Li, Hua Lu, Shu-Ming Zhao, Tian-Lun Jiang
BACKGROUND: Accurate and reliable blood grouping is essential for safe blood transfusion. However, conventional methods are qualitative and use only single-antigen detection. We overcame these limitations by developing a simple, quantitative, and multiplexed detection method for blood grouping using quantum dots (QDs) and magnetic beads. METHODS: In the QD fluorescence assay (QFA), blood group A and B antigens were quantified using QD labeling and magnetic beads, and the blood groups were identified according to the R value (the value was calculated with the fluorescence intensity from dual QD labeling) of A and B antigens...
2017: International Journal of Nanomedicine
Je Byeong Chae, Jungyoon Ohn, Je-Ho Mun
Digital mucous cysts (DMC) are common benign myxoid cysts typically located on the fingers and toes. Recently, dermoscopic patterns of DMC were reported. However, only a small number of cases were described in the published work; therefore, information on this topic is scarce in the published work. We investigated dermoscopic patterns of histopathologically diagnosed DMC. In total, 23 cases were enrolled in this study. Polarized dermoscopy revealed vascular patterns in 13 cases (56.5%), with arborizing vascular patterns, dotted vessels, linear vessels and polymorphous vessels in eight (34...
May 10, 2017: Journal of Dermatology
Chen Fu, Kun Qian, Ailing Fu
As a new family of nanomaterials, carbon dots (CDs) have been reported to enable to penetrate plasma membrane and show fluorescence in cells due to their small sizes and fluorescent properties. However, development of CDs as effective cellular imaging probes still remains a challenge, since they have relatively low efficiency of cell permeability which is difficult to be detected by a commonly used fluorescence microscope. Here we introduce arginine-modified carbon dots (Arg-CDs) with strong luminescence that could be used for cell imaging under common fluorescence microscope because of the high cellular uptake efficiency...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Anna L L Matos, Goreti Pereira, Paulo E Cabral Filho, Beate S Santos, Adriana Fontes
Quantum dots (QDs) are fluorescent nanocrystals that present unique optical properties, especially a high photostability. However, their use for intracellular studies is still limited since their passage through the living cell membranes does not occur passively. In this work, we adapted the ethanol injection method to encapsulate cationic hydrophilic QDs into fusogenic liposomes, to deliver them in living cells. Liposomes were characterized using zeta potential, dynamic light scattering (DLS), fluorescence microscopy and transmission electron microscopy (TEM)...
April 23, 2017: Journal of Photochemistry and Photobiology. B, Biology
Philip R Cohen
Red dot basal cell carcinoma is a unique variant of basal cell carcinoma. Including the three patients described in this report, red dot basal cell carcinoma has only been described in seven individuals. This paper describes the features of two males and one female with red dot basal cell carcinoma and reviews the characteristics of other patients with this clinical subtype of basal cell carcinoma. A 70-year-old male developed a pearly-colored papule with a red dot in the center on his nasal tip. A 71-year-old male developed a red dot surrounded by a flesh-colored papule on his left nostril...
March 22, 2017: Curēus
Dan Tulpan, Serge Leger
Worldwide genome sequencing efforts for plants with medium and large genomes require identification and visualization of orthologous genes, while their syntenic conservation becomes the pinnacle of any comparative and functional genomics study. Using gene models for 20 fully sequenced plant genomes, including model organisms and staple crops such as Coss., (L.) Heynh., (L.) Beauv., turnip ( L.), barley ( L.), rice ( L.), sorghum [ (L.) Moench], wheat ( L.), red wild einkorn ( Tumanian ex Gandilyan), and maize ( L...
March 2017: Plant Genome
Sheng Cao, Jinju Zheng, Jialong Zhao, Zuobao Yang, Chengming Li, Xinwei Guan, Weiyou Yang, Minghui Shang, Tom Wu
Colloidal ZnO nanoparticle (NP) films are recognized as efficient electron transport layers (ETLs) for quantum dot light-emitting diodes (QD-LEDs) with good stability and high efficiency. However, because of the inherently high work function of such films, spontaneous charge transfer occurs at the QD/ZnO interface in such a QD-LED, thus leading to reduced performance. Here, to improve the QD-LED performance, we prepared Ga-doped ZnO NPs with low work functions and tailored band structures via a room-temperature (RT) solution process without the use of bulky organic ligands...
May 1, 2017: ACS Applied Materials & Interfaces
Ryosuke Nishikubo, Norimitsu Tohnai, Ichiro Hisaki, Akinori Saeki
Lead halide perovskites have shown much promise for high-performing solar cells due to their inherent electronic nature, and though the color of bright-light emitters based on perovskite nanoparticles can be tuned by halide mixing and/or size control, dynamic switching using external stimuli remains a challenge. This article reports an unprecedented lower critical solution temperature (LCST) for toluene solutions containing methylammonium lead bromide (MAPbBr3 ), oleic acid, alkylamines, and dimethylformamide...
April 13, 2017: Advanced Materials
Young Ran Park, Hu Young Jeong, Young Soo Seo, Won Kook Choi, Young Joon Hong
Electroluminescence efficiency is crucial for the application of quantum-dot light-emitting diodes (QD-LEDs) in practical devices. We demonstrate that nitrogen-doped carbon nanodot (N-CD) interlayer improves electrical and luminescent properties of QD-LEDs. The N-CDs were prepared by solution-based bottom up synthesis and were inserted as a hole transport layer (HTL) between other multilayer HTL heterojunction and the red-QD layer. The QD-LEDs with N-CD interlayer represented superior electrical rectification and electroluminescent efficiency than those without the N-CD interlayer...
April 12, 2017: Scientific Reports
Xin Fu, Danyu Gu, Shengdong Zhao, Ningtao Zhou, He Zhang
In this paper, a rapid, simple and highly sensitive method with dual-readout (colorimetric and fluorometric) based on the nanometal surface energy transfer (NSET) between nitrogen-doped carbon quantum dots (NCQDs) and gold nanoparticles (AuNPs) for detection of biothiols is described. Highly luminescent NCQDs were prepared via a simple one-step hydrothermal method by applying sucrose and glycine as carbon and nitrogen sources. The results showed the obtained NCQDs had an average particle diameter of 5 nm and highly luminescent...
April 11, 2017: Journal of Fluorescence
Farah H Wolfe, Christine Deruelle, Thierry Chaminade
Sibling and friend relationships have significant impact on individuals' socio-emotional development. Hypothalamic supraoptic nucleus (SON) and paraventricular nucleus (PVN) synthesize and secrete neuropeptides, including oxytocin, associated with attachment behaviors. Here, using fMRI, we investigate the implication of these two hypothalamic nuclei in the visual processing of personally known faces.  Faces of same-sex sibling, best friend, celebrity, and unknown person appear in the middle of the screen while participants perform a task requiring a button click each time a central white dot turns red...
April 23, 2017: Social Neuroscience
Min Li, Yang Gao, Youyong Yuan, Yuzhe Wu, Zifang Song, Ben Zhong Tang, Bin Liu, Qi Chang Zheng
Photodynamic therapy (PDT) is a palliative technique that can improve median survival with minimal invasion for cholangiocarcinoma (CC) patients. An ideal photosensitizer (PS) is critical to guarantee the efficacy of PDT. However, conventional PSs have some obvious drawbacks, such as lack of specificity and easy aggregation in aqueous media that limit their further application in the clinic. We herein fully take advantage of a red emissive aggregation-induced emission (AIE) PS to fabricate integrin ανβ3 targeted organic AIE dots for image-guided PDT via a simple and straightforward one-step strategy...
April 25, 2017: ACS Nano
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