We have studied the radiation resistance of CaF2:Yb3+ (3 mol % YbF3) laser ceramics and a single crystal of similar composition (3.6 mol % YbF3) exposed to gamma rays in a 60Co source. The unirradiated samples have been shown to be similar in spectral characteristics. Even though irradiation lea...
We report a simple, low cost and environmentally friendly method to prepare NaYF4:Yb3+, Tm3+ upconversion microphosphors (UCMPs) by thermal decomposition of rare earth-trifluoroacetate precursors using paraffin as the high boiling non-coordinating solvent. The UCMPs exhibited cubic phase with de...
The main objective of the present work was to fabricate and find evidence of fluorescence in the optical films of some well established laser materials and as well as some other new materials have also been probed. Materials such as Nd:Yttrium Aluminum Garnet (Nd:YAG), Ti:Sapphire, NdF 3 ...
A novel modified glassy carbon electrode with holmium fluoride (HoF 3 ) nanoparticles (HoFNPs)-multiwalled carbon nanotubes (MWCNTs) is fabricated and then successfully used for the sensitive and selective determination of uric acid (UA) in the presence of ascorbic acid (AA) and dopamine...
Numerical modeling of cascade erbium-doped and holmium-doped fluoride fiber lasers is presented. Fiber lengths were optimized for cascade lasers that had fixed or free-running wavelengths using all known spectroscopic parameters. The performance of the cascade laser was tested against dopant con...
We combine all the known experimental demonstrations and spectroscopic parameters into a numerical model of the -doped fluoride glass fiber laser system. Core-pumped and cladding-pumped arrangements were simulated for all the population-bottlenecking mitigation schemes that have been tested, and...
Laser oscillation at 2.04 mu m has been observed in a thulium-sensitised holmium doped singlemode fluorozirconate fibre. 52% slope efficiency and 250 mW output power were obtained with a pump at 0.82 mu m. Cross relaxation in thulium gives a pump quantum efficiency of 1.30.>
We present the growth and the room-temperature spectroscopic analysis of three fluoride hosts, namely BaY 2 F 8 , LiYF 4 and KYF 4 , equally codoped with 5.2% thulium and 0.5% holmium, together with the cw laser results in the 2 μm wavelength region of BaYF and Y...
Neutron diffraction experiments have established the nature of the ordered antiferromagnetic state for the three compounds BaLn2F8, where Ln = Ho, Er, and Tm. Measurements were made at temperatures from 4.2 down to 0.3 K. Parallel to the c-axis the magnetic unit cell is twice as long as the chem...
Preparations and the X-ray structure determinations of the compound bis{(-[N-(2-[2-hydroxyethylamino]ethyl)salicylaldiminato]-perchlorate cadmium(II))} monohydrate [{Cd(C 1 1 H 1 5 N 2 O 2 )(ClO 4 )} 2 ].H 2 O ([(Cd sadol ClO 4 ...
The mixed-ligand mononuclear hexacoordinate cadmium perchlorate complex [Cd(2,2′-bipy)2(H2O)(ClO4)]ClO4 was synthesized and characterized by FT-IR, elemental analysis and X-ray crystal structure determination. Thermal characteristics of the complex were studied by thermogravimetry (TG), differe...
The molecular structure of diiodosilane has been determined by gas electron diffraction. Assuming C 2 v symmetry, only the S-I bond length (2.423(3)Å) and the I-Si-I bond angle (110.8(4) o ) could be determined accurately in this experiment. The experimental geometric paramet...
Monolithic carbon/nano-silicon composites with a three-dimensionally ordered macroporous (3DOM) structure were synthesized via a nanocasting route using a macro- and mesoporous silica monolith as a hard template for carbon with similar hierarchical porosity, followed by chemical vapor deposition...
Fluorescent nanohybrid materials, europium(III) complex intercalated Na+-smectite clay minerals (synthetic hectorite and natural montmorillonite), have been developed to visualize latent fingerprints. The guest europium(III) complex ([EuCl2(Phen)2(H2O)2]Cl·H2O) was obtained by simple complex re...
In this paper, a novel luminescent organic–inorganic hybrid material containing covalently bonded ternary europium complex in mesoporous silica MCM-41 has been successfully prepared by co-condensation of tetrethoxysilane (TEOS) and the modified ligand 2-phenyl-1H-imidazo[4,5-f][1,10]phen-3-(tri...
Knowledge of the mobility of Rare Earth Elements (REE) in crustal fluids is important for understanding both the formation of REE deposits and their use as geochemical tracers. This is particularly true for europium (Eu), which exists in both Eu(II) and Eu(III) states in natural fluids, making i...
A novel organo-functionalized mesoporous MCM-41 type of hybrid materials MCM–Si–DPBB was synthesized by co-condensation of bidentate Si(OR) 3 substituted N,N-2-diphenyloxyphosphine-4-bromomethyl-benzenamine (Si–DPBB) and tetraethoxysilane (TEOS) in the presence of the cetyltrimethylam...
Europium (III) (Eu3+)-doped hydroxyapatite (HAp) nanocrystals were synthesized in the presence of a cetyltrimethylammonium bromide (CTAB) to investigate the states of Eu3+ ions in the structure. The HAp structure was preserved with the doping as well as the CTAB existence, and the carbonate ions...
This paper firstly reports the second-order scattering (SOS) phenomenon in the nucleic acid system using a common spectrofluorometer. And a novel determination method of nucleic acids at nanogram level has been developed. Studies involving calf thymus DNA (ctDNA), fish sperm DNA (fsDNA) and yeas...
Half-sandwich samarium(III) diketiminate bromide was successfully synthesized and was shown to be active in methyl methacrylate (MMA) polymerization. The effects of temperature, polymerization time and catalyst concentration were studied. Activities of ca. 18kg of polymethacrylate (PMMA) per mol...
About|Contact|Cas|Product Name|Molecular|Country|Encyclopedia
Message|New Cas|MSDS|Service|Advertisement|CAS DataBase|Article Data|Manufacturers | Chemical Catalog
©2008 LookChem.com,License: ICP
NO.:Zhejiang16009103
complaints:service@lookchem.com Desktop View