luminescence – TechConnect Briefs

RECAL: A New Ultrastable Luminescent Probe for Bioimaging

Borders B.C., Kang C.H., Brozik J.A., Photon Biosciences, LLC, US

Luminescent probes, such as fluorescent proteins, fluorescent dyes, phosphorescent dyes, and quantum dots, are important tools in biology, biophysics, and medical diagnostics. While these tools are incredibly useful and are suitable for use in many [...]

Effect of Pressure and Excitation Power on Up-conversion Assisted White Light Emission in Yttrium Oxide and Silicate Nanophosphors

Eryurek G., Erdem M., Bilir G., Istanbul Technical University, TR

The production of warm artificial white light (WL) become a big challenge of engineers and scientists after the revolutionary introduction of incandescent lamp by Thomas Edison. Although several strategies have been developed in past, none [...]

Structural and Luminescent properties of Europium benzene-1,3,5-tricarboxylate

Alejandre-Zuniga B.Y., Loera-Serna S., Medina-Velazquez D.Y., Universidad Autonoma Metropolitana-Azcapotzalco, MX

The increasing demand of optoelectronic devices requires the development of luminescent materials with high luminescence quantum efficiency and reduced energy consumption, to this organic matrix materials doped with rare earths offer an great alternative. The [...]

Controllable Synthesis of Monodisperse CaF2 microsphere and the investigation on luminous performance of CaF2:Ce3+/Tb3+

Sun Q., Sun X., Hu X.Y., Fan J., Zhan S.C., Wang Y., Wang Z.Z., Wang Y., Wang Z.Z., Sun Q., Sun X., Hao Y.Y., Northwest University, CN

Highly uniform and well-dispersed CaF2 microsphere and hollow spheres with tunable particles size (100nm-900nm) have been successfully synthesized by a facile hydrothermal process using ethylenediaminetetraacetic acid disodium as a complexing reagent. The XRD results indicated [...]

Time-Resolved Luminescence Measurements on Up-Conversion Phosphors for Electron Beam Sterilization Monitoring

Reitzig M., Härtling T., Winkler M., Powers P.E., Derenko S., Röder O., Opitz J., Fraunhofer Institute for Nondestructive Testing IZFP, Dresden Branch, DE

We present recent investigations on time-resolved measurements on alterations in the temporal luminescence decay of up-conversion phosphors induced by electron beam treatment. As a consequence of the tight regulations concerning sterility in the food and [...]

Application of direct growth ZnO nanaotetrapods in field emission device

Zhang Q., Zhang Y., Qi J., Zhang Q., Zhang Y., Liao Q., Ye N., University of Science and Technology, Beijing, CN

In summary, we demonstrate the ZnO nanotetrapod synthesized by a simple vapor phase transport process can be good field emission emitters. The field emission measurement as-synthesized materials reveal that these samples have low turn-on field [...]

Fabrication of Luminescent Superparamagnetic CdSe-QDs/SiO2/Fe3O4 nanocomposite particles

Liu B., Wang D., Huang W., Xie W., Yu M., Yao A., Tongji University, CN

A new kind of water-soluble luminescent superparamagnetic nanocomposite particles has been synthesized using a modified Stöber method combined with an electrostatic assembly process. Fe3O4 nanoparticles with the size of 10 nm were uniformly coated with [...]

Synthesis and Characterization of Nanocrystalline Eu3+-doped Gd2O3

Jáuregui-Rosas S., Tomar M., Jia W., Vásquez O., Fachini E., University of Puerto Rico, Mayaguez Campus, PR

Nanocrystalline Gd2-xEuxO3 phosphors by a simple sol-gel method have been synthesized. The effects of the annealing temperature and atomic fraction of Eu3+ ions (x) on the structural and luminescence properties of the mixed oxides have [...]

Near-Field Raman and Luminescence Spectroscopies to evidence chemical heterogeneity of surfaces with sub-wavelength spatial resolution

Humbert B., Grausem J., Dossot M., Cremel S., LCPME UMR 7564 CNRS-UHP, FR

Near-field scanning optical microscopy (NSOM or SNOM) offers the opportunity to collect optical information at a spatial scale well below the diffraction limit. Using a silica fiber tip coated with aluminum and having a small [...]

In vivo imaging by luminescent carbon nanotubes

Shi D., Guo Y., Dong Z., Lian J., Wang W., Liu G., Ewing R., University of Cincinnati, US

There is currently an increasing need for early detection of cancer before anatomic anomalies are visible. A major challenge in cancer diagnosis is to be able to locally biomark the cancer cells in clinical pathology [...]