photoluminescence – TechConnect Briefs

Highly luminescent Ca3Sc2Si3O12:Ce3+ silicate garnet nano- and microparticles with 50-70% photoluminescence quantum yields as efficient phosphor converters for white LEDs

Levchuk I., Schröppel F., Römling L., Osvet A., Khaidukov N., Zorenko Y., Van Deun R., Batentschuk M., Brabec C.J., University of Erlangen-Nuremberg, DE

Solid state lighting based upon a combination of violet/blue light emitting diodes (LEDs) and a phosphor converter created enormous commercial interest because of the potentially higher efficacies and long lifetimes of these light sources. Most [...]

Surface Chemistry of Metal Oxide Nanoparticles and Attachment of Metal Nanoclusters: Sensor, Optoelectronic, and Catalytic Applications

Whitten J.E., University of Massachusetts-Lowell, US

Metal oxide nanoparticles are surprisingly reactive, and some undergo changes in color or in their photoluminescence (PL) spectra upon reaction. In the latter case, visible emission arises from electron decay from surface related states, and [...]

Photoluminescence Studies of Green Synthesized Copper Nanoparticles

Annapurna S., Suresh Y., Sreedhar B., Singh A.K., Bhikshamaiah G., Osmania University College for Women, IN

Copper nanoparticles are prepared using a two stage chemical reduction method. Potato starch and Ocimum Sanctum leaf extract are used to stabilize the copper nanoparticles. This approach is proved to be an efficient method for [...]

Quantum-Confinement Effects on Oscillator Strength in ZnO Quantum Dots

Tit N., UAE University, AE

We present a theoretical investigation of the quantum confinement effects (QC) on the electronic and optical properties of ZnO quantum dots (QDs) embedded in MgO matrix. The latter material acts a huge barrier for both [...]

Microwave-assisted hydrothermal synthesis of Cu-doped titanate nanotubes: photoluminescence and photocatalysis properties

Manfroi D.C., Andrade L.P., Cavalheiro A.A., Jos A.A., Teixeira G.F., Perazolli L.A., Varela J.A., Zaghete M.A., Universidade Estadual Paulista, BR

Alkali titanates have been intensively investigated mostly because of their properties. And the interest for transition metal doping of 1D titanate nanostructures is enormous, especially copper. In the present work we report the synthesis of [...]

Microwave-assisted hydrothermal synthesis of Cu-doped titanate nanotubes: photoluminescence and photocatalysis properties

Manfroi D.C., Andrade L.P., Cavalheiro A.A., Jos A.A., Teixeira G.F., Perazolli L.A., Varela J.A., Zaghete M.A., Universidade Estadual Paulista, BR

Alkali titanates have been intensively investigated mostly because of their properties. And the interest for transition metal doping of 1D titanate nanostructures is enormous, especially copper. In the present work we report the synthesis of [...]

Green, Cubic Y2O3: Tb3+ Nanospheres: Synthesis and Photoluminescence Property

Miao H., Hu X.Y., Sun Q., Sun X., Wang Z.Z., Sun Q., Sun X., Zhang D.K., Bai J.T., Hou X., Northwest University, CN

Tb3+-doped Y2O3 green nanospheres were prepared via the simple, cost-effective urea homogeneous precipitation method without additives. Nanospheres were characterized by X-ray diffraction, Scanning electron microscope, Photoluminescence spectroscopy. The specimens annealed above 800oC are well matched [...]

Funcional lead-free composite

Teixeira G.F., de Oliveira J.A.M., Zaghete M.A., Longo E., Varela J.A., Chemistry Institute, UNESP- Araraquara, BR

In the work reported here was obtained a lead-free NaNbO3 / PVDF composite, starting from photoluminescent ceramics particles with 1D morphology obtained by microwave-assisted hydrothermal method. Photoluminescence spectrum of the NaNbO3 particles shown emission around [...]

Sb2S3 Nanocrystals in glass

Mishra R.K., University of Delhi, IN

In this work conventional quench method was adopted to fabricate Sb2S3 nanocrystals in glass. To ensure proper mixing and homogeneity of the composition the base glass constituents SiO2, B2O3, Na2O, K2O, ZnO were mixed by [...]

Electronic effects in CdSe/ZnS quantum dots conjugated to Interleukin 10 antibodies

Torchynska T.V., Casas Espinola J.L., Douda J., López de la Luz O.S., Instituto Politecnico Nacional, MX

Photoluminescence (PL) and Raman scattering spectra of none- and bio-conjugated CdSe/ZnS and CdSeTe/ZnS quantum dots (QDs) have been studied. QDs, characterized by emission at 605, 655 and 705nm, have been conjugated with anti Interleukin 10 [...]