Luminescence Of Ag Research Articles

Synthesis, crystal structure and luminescence of Ag(I) coordination polymers based on a new sulfonate functionalized terpyridine derivative ligand

Two new Ag(I) coordination compounds, [Ag(HTBDS)(H2O)]n·3nH2O (1), [Ag2(TBDS)(2,2′-bipy)(H2O)]n (2) [H2TBDS=4-([4,2′:6′,4″-terpyridine]-4′-yl)benzene-1,3-disulfonic acid, 2,2′-bipy=2,2′-bipyridine] have been successfully synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, single crystal X-ray diffraction. Compound 1 is formed at the pH value of 5.0, exhibits a 3-connected 2D layer structure with the hcb topological net, and further linked by O–H⋯O and N–H⋯O hydrogen bonds to form a 3D supramolecular framework. When introducing the 2,2′-bipy and increasing the pH value to 6.0, compound 2 is generated. It displays a 3D network with ths topological net. Interestingly, the distorted 2,2′-bipy shows a μ2-η1:η1 bridging mode to connect two Ag(I) ions into a rare six-membered ring with strong Ag⋯Ag interactions, which plays an important role in the formation of the coordination polymer structure of 2. Additionally, the thermal stabilities and photoluminescence properties of 1–2 were also investigated.

Optical properties of SrS:Cu,Ag two-component phosphors for electroluminescent devices

The luminescence characteristics of a two-component electroluminescent (EL) phosphor, SrS:Cu,Ag, were investigated by optical spectroscopy. Motivated by the discovery of efficient EL from SrS:Cu, SrS:Ag was investigated but exhibited poor EL emission, even though it showed a superior blue color. Thus, SrS:Cu,Ag samples were prepared in order to investigate if the Ag luminescence could be sensitized to produce a more efficient and saturated blue EL phosphor. A detailed spectroscopic study on SrS:Cu,Ag revealed that the emission characteristics of SrS:Cu,Ag were identical to SrS:Ag, whereas the excitation spectra resembled SrS:Cu. These results demonstrated the efficient energy transfer from Cu to Ag, confirming the successful sensitization.

Luminescence of Ag + in crystalline and glassy SrB 4O 7

The luminescence of Ag + in SrB 4O 7 in the crystalline and glassy modification is reported. Three types of Ag centres are identified. The luminescence of isolated Ag + ions in the crystalline phase is characterized by a relatively long emission wavelength (290 nm), a small Stokes shift (6200 cm −1) and a short decay time (14μs at 300 K). Also luminescent Ag +-pairs and non-luminescent Ag 0 are observed. In the glassy modification of SrB 4O 7 the same Ag centres are observed. The emission bands are shifted to longer wavelengths.

Luminescence analysis of LiCl: Ag single crystal using synchrotron radiation

For the first time, luminescence of Ag + impurities in LiCl is observed and analysed by exciting in the UV vacuum range using synchrotron radiation. One of the two flourescence emissions observed is likely due to isolated silver ions, while the centers responsible of the other one are not yet clearly identified.