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Li Shuo - - 2014
White light-emitting diodes have recently attracted great attention as promising candidates for next-generation lighting. The LuVO4:Eu3+,Bi3+ as new near-ultraviolet excited phosphors were synthesized via high-temperature solid-state reactions. The X-ray diffraction, excitation spectra, emission spectra and decay lifetimes of the phosphors were measured to characterize the structure and luminescent properties. With ...
Jin Ye - - 2014
Tb3+, Eu3+, Tm3+ co-doped Na5La(MoO4)4 phosphors were prepared by the conventional solid-state reaction. Under the excitation of UV light, Na5La(MoO4)4:Tm3+, Na5La(MoO4)4:Tb3+, and Na5La(MoO4)4:Eu3+ exhibit the characteristic emissions of Tm3+ (1D2 --> 3F4, blue), Tb3+ (5D4 --> 7F5, green), and Eu3+ (5D0 --> 7F2, red), respectively. By adjusting the doping concentration ...
Seidl-Adams Irmgard I Center of Chemical Ecology, Entomology Department, The Pennsylvania State University, University Park PA 16802, - - 2014
Maize seedlings emit sesquiterpenes during the day in response to insect herbivory. Parasitoids and predators use induced volatile blends to find their hosts or prey. To investigate the diurnal regulation of biosynthesis and emission of induced sesquiterpenes we applied linolenoyl-L-glutamine (LG) to maize seedlings in the morning or evening using ...
Balakrishnan Kaushik K College of Optical Sciences, University of Arizona, 1620 East University Boulevard, Tucson, Arizona 85721, USA. kaushik@optics.arizona.edu - - 2014
Co-assembled structures possessing tunable light emission from 510-690 nm have been prepared using various compositions of two different 4,7-substituted benzothiadiazole molecules, and . The preferential incorporation and co-localization of and to produce co-assemblies are possible because of structural similarities and allow for tuning of morphology and light emission.
Steinitz G G Geological Survey of Israel (GSI), 30 Malkhei Israel, Jerusalem 95501, Israel. Electronic address: - - 2014
Signals from radon in air enclosed in a tight canister are recorded by five gamma detectors located around the horizontal plane and along the vertical axis. At steady state conditions (diffusion input = radon decay) the primary variation is of daily radon (DR) signals with amplitudes of around 20-25%. The DR signal, ...
de Mello Gallep Cristiano C LaFA/Applied Photonics Lab., School of Technology, University of Campinas, Limeira, - - 2014
The detection of ultraweak light emission in seedlings has been explored in toxicological and chronobiological studies. The main studies in this area are reviewed briefly, including a report on applied tests held in the last 7 years at LaFA - UNICAMP (Brazil). In general, results indicate that a linear relation ...
Park Jin Young JY Department of Polymer Science and Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 702-701 Republic of Korea. - - 2014
The photo- (PL) and electroluminescence (EL) properties of CdSe-TOPO quantum dots (QDs) doped into a PVK:PBD host matrix with a double-layer device configuration [PEDOT:PSS/PVK:PBD/QDs/LiF/Al] are investigated. Depending on the concentrations of CdSe-TOPO QDs, EL properties are changed including the emitted colors. At a low QD concentration (1 wt%), QD-light emitting ...
Chen Bin B College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China. - - 2014
Incorporation of polycyclic aromatic hydrocarbons into siloles enhances their light emission in solutions but lowers emission efficiency in the aggregated state. The competitive interaction between conjugation and rotation is thus studied.
Huang Jing J Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Opto-Electronic Materials, Wuhan University, Wuhan 430072 (P.R. China), Fax: - - 2014
Two aggregation-induced emission active luminogens (TPE-pTPA and TPE-mTPA) were successfully synthesized. For comparison, another six similar compounds were prepared. Because of the introduced hole-dominated triphenylamine (TPA), fluorene groups with high luminous efficiency, and unconjugated linkages, the π conjugation length of the obtained luminogens is effectively restricted to ensure their blue ...
Wang Lingqing L Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: - - 2014
The Bayan Obo mine, located in Inner Mongolia, China, is the largest light rare earth body ever found in the world. The research for rare earth elements (REEs) enrichment in atmospheric particulates caused by mining and ore processing is fairly limited so far. In this paper, atmospheric particulates including total ...
Deng Lingling - - 2014
In top-emitting white organic light-emitting diodes (TWOLEDs), it is usually difficult to realize a good chromaticity due to the strong suppression on the blue emission induced by the microcavity effect. In our work, the blue emission layer (EML) is located near the hole transport layer and the reflective anode to ...
Ferrari Lorenzo - - 2014
Hyperbolic metamaterials can enhance spontaneous emission, but the radiation-matter coupling is not optimized if the light source is placed outside such media. We demonstrate a 3-fold improvement of the Purcell factor over its outer value and a significant enlargement in bandwidth by including the emitter within a Si/Ag periodic multilayer ...
Sukul Pradip K PK Polymer Science Unit, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Rd, Jadavpur, Kolkata-700032 - - 2014
With the aid of rational design, we have synthesized a pair of water-soluble donor- and acceptor-type twisted perylene bisimide units, which together form aggregates upon lowering the pH of the medium, providing bright yellow fluorescence. The light-harvesting efficiency of the co-assembled system can be tuned by controlling the ratio of ...
Moon Kyeong-Ju KJ Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seoul 120-749, Republic of Korea. - - 2014
A novel heterojunction white light emitting diode (LED) structure based on an array of vertically aligned surface-passivated p-type porous Si nanowires (PSiNWs) with n-type amorphous In-Ga-Zn-O (a-IGZO) capping is introduced. PSiNWs were initially synthesized by electroless etching of p-type Si (100) wafers assisted by Ag nanoparticle catalysts and then surface-passivated ...
Sharma Vijay Kumar VK UNAM-Institute of Materials Science and Nanotechnology, Department of Electrical and Electronics Engineering, and Department of Physics, Bilkent University , Ankara 06800, - - 2014
We report white-light-emitting Mn-doped ZnSe nanocrystals (NCs) that are synthesized using modified nucleation doping strategy. Tailoring three distinct emission mechanisms in these NCs, which are MnSe-related blue emission (410 and 435 nm), Zn-related defect state green emission (520 nm), and Mn-dopant related orange emission (580 nm), allowed us to achieve ...
Hwa Mei-Yin MY Department of Safety, Health and Environmental Engineering, Tungnan University, No.152, Sec. 3, PeiShen Rd., ShenKeng, New Taipei City, 22202, - - 2014
This investigation adopts vehicle tracking manner to establish real-world driving patterns and estimates emission factors with dynamometers with 23 traffic-driving variables for 384 in-use light-duty passenger vehicles during non-rush hour. Adequate numbers of driving variables were decided with factor analysis and cluster analysis. The dynamometer tests were performed on FTP75 ...
Kaihovirta Nikolai - - 2014
The organic light-emitting electrochemical cell (LEC) has emerged as an enabling technology for a wide range of novel and low-cost emissive applications, but its efficiency is still relatively modest. The focus in the field has so far almost exclusively been directed towards limiting "internal" loss mechanisms, whereas "external" losses due ...
Zhang Xuejie - - 2014
Thermal management is still a great challenge for high-power phosphor-converted white-light-emitting diodes (pc-WLEDs) intended for future general lighting. In this paper, a series of single-component white emitting silicate SiO2-Li2O-SrO-Al2O3-K2O-P2O5: Ce3+, Tb3+, Mn2+ (SLSAKP: Ce3+, Tb3+, Mn2+) glasses that simultaneously play key roles as a luminescent convertor and an encapsulating material ...
Kumar Vinod V Department of Physics, University of the Free State, Bloemfontein ZA9300, South Africa. Electronic address: - - 2014
This paper reports on the sonochemical synthesis of zinc oxide (ZnO) nanophosphors (NPr) at different ultrasonication times (5min, 30min, 1h, 5h, 10h and 15h) for near white light emission applications. X-ray photoelectron spectroscopy indicated that the O1s peak consists of two components. These were O1 (ZnO) and O2 (deficient oxygen; ...
Kauny Jocelyn J iBiTec-S, CNRS UMR 8221, CEA Saclay, 91191 Gif-sur-Yvette, France. Electronic address: - - 2014
We measured the kinetics of light-induced NADPH formation and subsequent dark consumption by monitoring in vivo its fluorescence in the cyanobacterium Synechocystis PCC 6803. Spectral data allowed the signal changes to be attributed to NAD(P)H and signal linearity vs the chlorophyll concentration was shown to be recoverable after appropriate correction. ...
Berger Christopher J CJ Department of Chemistry, University of Alberta , 11227 Saskatchewan Drive, Edmonton, Alberta, Canada T6G - - 2014
A series of Lewis base adducts of 9-bromo-9-borafluorene (BrBFl-LB, LB = IPr, IPrCH2, PPh3, and PCy3), parent borafluorenes (HBFl-IPr and HBFl-IPrCH2), and the bisadduct [(DMAP)2BFl]Br were prepared and structurally characterized (IPr = [(HCNDipp)2C:], IPrCH2 = [(HCNDipp)2C═CH2], Dipp = 2,6-i-Pr2C6H3, and DMAP = N,N-dimethylaminopyridine). The adducts BrBFl-IPr, BrBFl-PPh3, BrBFl-PCy3, [(DMAP)2BFl]Br, BrBFl-IPrCH2, ...
Gilmore Adam Matthew - - 2014
Contemporary spectrofluorimeters comprise exciting light sources, excitation and emission monochromators, and detectors that without correction yield data not conforming to an ideal spectral response. The correction of the spectral properties of the exciting and emission light paths first requires calibration of the wavelength and spectral accuracy. The exciting beam path ...
Fabbri Filippo F 1] IMEM-CNR Institute, Parco area delle Scienze 37/A, Parma, (Italy) - - 2014
Silicon, the mainstay semiconductor in microelectronic circuitry, is considered unsuitable for optoelectronic applications owing to its indirect electronic band gap, which limits its efficiency as a light emitter. Here we show the light emission properties of boron-doped wurtzite silicon nanowires measured by cathodoluminescence spectroscopy at room temperature. A visible emission, ...
Chaqmaqchee Faten Adel Ismael FA University of Koya, Faculty of Science and Health, Kurdistan Region, Koya KOY45, IRAQ. - - 2014
The Top-Hat hot electron light emission and lasing in semiconductor heterostructure (HELLISH)-vertical-cavity semiconductor optical amplifier (THH-VCSOA) is a bidirectional light-emitting and light-absorbing heterojunction device.The device contains 11 Ga0.35In0.65 N0.02As0.08/GaAs MQWs in its intrinsic active region which is enclosed between six pairs of AlAs/GaAs top distributed Bragg reflectors (DBRs) and 20.5 pairs of ...
Sigaev Vladimir N VN P.D. Sarkisov International Laboratory of Glass-based Functional Materials, Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, 125190 Moscow, - - 2013
Wide-bandgap nanocrystals are an inexhaustible source of tuneable functions potentially addressing most of the demand for new light emitting systems. However, the implementation of nanocrystal properties in real devices is not straightforward if a robust and stable optical component is required as a final result. The achievement of efficient light ...
Shang Mengmeng M State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, Jilin, China. jlin@ciac.ac.cn - - 2013
White light-emitting diodes (WLEDs) as new solid-state light sources have a greatly promising application in the field of lighting and display. So far much effort has been devoted to exploring novel luminescent materials for WLEDs. Currently the major challenges in WLEDs are to achieve high luminous efficacy, high chromatic stability, ...
Song Shuang S Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Capital Normal University, Beijing 100048, China. - - 2013
The 2D isostructural lanthanide-organic frameworks [Ln(4-SBA)(IP)OH]·1.5H2O (Ln = Sm , Eu , Gd and Tb ; 4-SBA = 4-sulfobenzoate and IP = 1H-imidazo[4,5-f][1,10]-phenanthroline) display different luminescent behavior. White light emission was realized by introducing single dopant Eu(iii) and codopants Eu(iii)/Gd(iii) or Eu(iii)/Tb(iii) into the Sm(iii) framework for the first time.
Bozlaker Ayse - - 2013
We report the elemental composition, including Rh, Pd, and Pt, of total (i.e. tailpipe and non-tailpipe) PM2.5 and PM10 emissions from predominantly gasoline-driven light-duty vehicles (LDVs) traversing the Washburn Tunnel in Houston, Texas during November and December, 2012. Using a novel sample preparation and dynamic reaction cell-quadrupole-inductively coupled plasma-mass spectrometry ...
Barrera E W - - 2013
Monoclinic Yb-sensitized (Tm, Ho)-doped KLu(WO4)2 nanocrystals of ∼100 nm size have been synthesized by the modified Pechini sol-gel method. Their diode laser near-infrared (∼980 nm) excited upconversion emission properties have been characterized at power densities in the range 30-355 W cm(-2). Bright white light composed of blue ∼475 nm, green ...
Ambast A K - - 2013
A series of barium tungstate (BaWO<sub>4</sub>) phosphors were synthesized by the solid state reaction method, and the systematic effect of Dy<sup>3+</sup>/Sr<sup>2+</sup> doping concentration on the structural and photoluminescence (PL) properties were investigated. X-ray diffraction studies confirm the structure of the phosphors as tetragonal with space group I4<sub>1</sub>/a. The PL emission ...
Zhang Xinguo - - 2013
A series of NaCaBO3:Ce(3+),Tb(3+),Mn(2+) borate phosphors were prepared via a high-temperature solid-state reaction. The obtained phosphors exhibit a strong excitation band between 250 and 400 nm, matching well with the dominant emission band of a NUV light-emitting-diode (LED) chip. The phosphors can generate light from blue to green, and from ...
Xi Zheng - - 2013
We report a two-colored plasmonic antenna which can control the directivity of the excitation and emission light independently and simultaneously. By carefully tuning the phase difference of the constituting elements of the antenna, unidirectional fluorescence emission and laser light scattering can be obtained. In particular, the direction of the maximum ...
Lim Jong Min - - 2013
A cyclometalated iridium(II) complex, bis(2-thiophen-2-yl-quinolinato)(acetoacetonate)iridium(II) [(tq)2Ir(III)(acac)] was synthesized for use in phosphorescent organic light-emitting diodes. The photophysical and electrochemical properties of the iridium(Ill) complex were characterized by UV-visible absorption, photoluminescence, and cyclic voltammetry. The maximum UV-visible absorption of (tq)2Ir(acac) was observed at 289 nm. (Tq)2Ir(acac) in dichloromethane showed its maximum ...
van Hulst Niek F - - 2013
By directing light, optical antennas can enhance light-matter interaction and improve the efficiency of nanophotonic devices. Here we exploit the interference between the electric dipole, quadrupole and magnetic dipole moments of a split-ring resonator to experimentally realize a compact directional optical antenna. This single-element antenna design robustly directs emission even ...
Peimyoo Namphung - - 2013
Monolayer WS2 (1L-WS2), with a direct bandgap, provides an ideal platform to investigate unique properties of two-dimensional (2D) semiconductors. In this work, light emission of 1L-WS2 triangle has been studied by using steady-state, time-resolved and temperature-dependent photoluminescence (PL) spectroscopy. Two groups of 1L-WS2 triangles have been grown by chemical vapor ...
Tan Kejun - - 2013
This report presents a highly sensitive, poly(A)-stabilized gold nanoparticle-based assay with dual readouts (resonance light scattering and colorimetric) for detecting palmatine hydrochloride (PaH) in real samples. The detection mechanism is based on the fact that palmatine hydrochloride has strong affinity to poly(A), which can stabilize gold nanoparticles at high ionic ...
Ni Wen-Xiu - - 2013
White light: [{Au(L)}3 ] (L=3-(2-thienyl)pyrazolate) gives dual emission, one from an organic chromophore the other from aurophilic stacking interactions. The resulting blue-green and orange-red emissions can be tuned to approach white-light by modulating the aggregation behavior of the cluster.
Kountouriotis A - - 2013
In the area of petrol stations several Volatile Organic Compounds (VOCs) leak into the atmosphere due to the evaporation of liquid fuels, especially of gasoline that is predominantly composed of light hydrocarbons. The aim of the present study is to investigate the spatial distribution of various VOCs when leaked into ...
Dallmann Timothy R - - 2013
Vehicle emissions of nitrogen oxides (NOx), carbon monoxide (CO), fine particulate matter (PM2.5), organic aerosol (OA) and black carbon (BC) were measured at the Caldecott tunnel in the San Francisco Bay Area. Measurements were made in the middle bore of the tunnel where light-duty (LD) vehicles accounted for >99% of ...
Divitt Shawn - - 2013
Light emission from the junction of a scanning tunneling microscope (STM) is examined in the presence of 20 nm topographical features in thin gold films. These features significantly modify the emission rates of the junction. Contributions to this modification are discriminated by examining emission rates on samples where the material ...
Goswami Shreerup S Department of Geology, Ravenshaw University Cuttack-753 003, India. - - 2013
A preliminary assessment of noise levels during Deepawali, was made in the present study. In order to assess the situation of noise levels in and around Balasore during two consecutive Deepawali of the year 2010 and 2011; noise monitoring was carried out in three different specified times (4:30-7:00 p.m., 7:00-10:30 ...
Griest Kim - - 2013
We present new limits on the allowed masses of a dark matter (DM) halo consisting of primordial black holes (PBH) (or any other massive compact halo object). We analyze two years of data from the Kepler satellite, searching for short-duration bumps caused by gravitational microlensing. After removing background events consisting ...
Forestieri Sara - - 2013
Eight light-duty gasoline low emission vehicles (LEV I) were tested on a Chassis dynamometer using the California Unified Cycle (UC) at the Haagen-Smit vehicle test facility at the California Air Resources Board in El Monte, CA during September 2011. The UC includes a cold start phase followed by a hot ...
Kyriienko O - - 2013
Dipolaritons are mixed light-matter quasiparticles formed in double quantum wells embedded in microcavities. Because of resonant coupling between direct and indirect excitons via electronic tunneling, dipolaritons possess large dipole moments. Resonant excitation of the cavity mode by a short pulse of light induces oscillations of the indirect exciton density with ...
Lai Chun-Feng - - 2013
The fabrication of fluorescence polymer/InGaN hybrid light-emitting diodes (LEDs) that emit highly bright broadband red light is presented in this Letter. The absorption peak of the fluorescence polymer was 455 nm, and the emission peak was 640 nm. The light output power and external quantum efficiency of hybrid LEDs at a driving ...
Tantot A - - 2013
Prompted by intriguing events observed in certain particle-physics searches for rare events, we study light and acoustic emission simultaneously in some inorganic scintillators subject to mechanical stress. We observe mechanoluminescence in Bi_{4}Ge_{3}O_{12}, CdWO_{4}, and ZnWO_{4}, in various mechanical configurations at room temperature and ambient pressure. We analyze the temporal and ...
Di Camillo Daniela - - 2013
The authors report on the realization of ordered arrays of light-emitting conjugated polymer nanofibers by near-field electrospinning. The fibers, made from poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene], have diameters of a few hundreds of nanometers and their emission peaked at 560 nm. The observed blue-shift compared to the emission from reference films is attributed to ...
Vyhnan N - - 2013
The size dependence of the temperature coefficient (sensitivity) of the photoluminescence (PL) peak position of CdTe quantum dots stabilized by thioglycolic acid in aqueous solution has been investigated. Temperature sensitivity increases as the average radius of CdTe quantum dots decraeases. This must be taken into account in the design of ...
Zhang Yi-Hua - - 2013
New 1D lanthanide-organic frameworks, [Ln(dpdc)1.5(IP)(H2O)]n (Ln = Sm 1, Eu 2, Gd 3; dpdc = 2,2'-diphenyldicarboxylate and IP = 1H-imidazo[4,5-f][1,10]-phenanthroline), were synthesized. White light emission was realized by two approaches: a single component Sm(iii) framework and a two-component Eu(iii)-doped Gd(iii) framework.
Xu Kaikai - - 2013
In this paper, the emission of visible light by a monolithically integrated silicon p-n junction under reverse-bias is discussed. The modulation of light intensity is achieved using an insulated-gate terminal on the surface of the p-n junction. By varying the gate voltage, the breakdown voltage of the p-n junction will ...
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