Core–Shell Engineering to Enhance the Spectral Stability of Heterogeneous Luminescent Nanofluids
Lucía Labrador-Páez, Marco Pedroni, Krisjanis Smits, Adolfo Speghini, Francisco Jaque, José García-Solé, Daniel Jaque,* and Patricia Haro-González The tendency to the miniaturization of devices and the peculiar properties of the nanoparticles have raised the interest of the scientific community in nanoscience. In particular, those systems consisting of nanoparticles dispersed in fluids, known as nanofluids, have […]
Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles
Lucía Labrador-Páez, Dragana J. Jovanovic´, Manuel I. Marqués, Krisjanis Smits, Slobodan D. Dolic´, Francisco Jaque, Harry Eugene Stanley, Miroslav D. Dramic´anin, José García-Solé, Patricia Haro-González, and Daniel Jaque* Nowadays a large variety of applications are based on solid nanoparticles dispersed in liquids—so called nanofluids. The interaction between the fluid and the nanoparticles plays a decisive […]
Luminescence and Raman Detection of Molecular Cl2 and ClClO Molecules in Amorphous SiO2 Matrix
Linards Skuja*† , Koichi Kajihara‡, Krisjanis Smits†, Andrejs Silins†, and Hideo Hosono§ Chlorine is a common undesirable impurity in synthetic SiO2 glass for ultraviolet optics and optical fibers. It is usually incorporated into glass as bound Si–Cl groups or interstitial Cl2molecules. We report a high-sensitivity detection of Cl2 in amorphous SiO2 (a-SiO2) by photoluminescence (PL) […]
Radioluminescence, thermoluminescence and dosimetric properties of ZnO ceramics
Larisa Grigorjeva, Aleksejs Zolotarjovs, Sergej Yu Sokovnin, Donats Millers, Krisjanis Smits, Vladislav G. Il`ves Two types of ZnO ceramics were fabricated and characterized by XRD, SEM methods. The radioluminescence spectra were measured within the 300–550 K range. The defect luminescence band peaking at ~2.35 eV is the dominant one in radioluminescence spectra in both of the fabricated […]
Effect of Mg2+ ions co-doping on luminescence and defects formation processes in Gd3(Ga,Al)5O12:Ce single crystals
V. Babin , P. Bohacek , L. Grigorjeva , M. Kucera , M. Nikl , S. Zazubovich , A. Zolotarjovs Photo- and radioluminescence and thermally stimulated luminescence characteristics of Ce3+ – doped and Ce3+, Mg2+ co-doped Gd3(Ga,Al)5O12 (GAGG) single crystals of similar composition are investigated in the 9-500 K temperature range. The Ce3+ – related […]
Colorimetric gas detection by the varying thickness of a thin film of ultrasmall PTSA-coated TiO2 nanoparticles on a Si substrate
Urmas Joost, Andris Šutka, Meeri Visnapuu, Aile Tamm, Meeri Lembinen, Mikk Antsov, Kathriin Utt, Krisjanis Smits, Ergo Nõmmiste and Vambola Kisand Colorimetric gas sensing is demonstrated by thin films based on ultrasmall TiO2 nanoparticles (NPs) on Si substrates. The NPs are bound into the film by p-toluenesulfonic acid (PTSA) and the film is made to absorb […]
Tunneling luminescence in long lasting afterglow of SrAl2O4:Eu,Dy
Virginija Liepina, Donats Millers, Krisjanis Smits A long lasting (afterglowing) luminescent material SrAl2O4: Eu2+, Dy3+ was prepared by high temperature solid-state reaction method. The processes responsible for long lasting luminescence were studied by means of luminescence spectra, thermally stimulated luminescence and afterglow kinetics.Two processes are found to contribute in excited Eu2+ creation – the thermally […]