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Influence of heavy metal oxide and activator concentration on spectroscopic properties of Eu3+, Dy3+ and Tb3+ ions in lead borate glasses

100%

Zur L. , Pisarska J. , Pisarski W. A.

tom Vol. 42, nr 2

345-352

Heavy metal lead borate glasses doped with rare earth ions were examined. The influence of heavy metal oxide PbO and activator concentration on luminescence properties of rare earth ions are discussed. Rare earth ions were limited to Eu3+, Dy3+ and Tb3+ which are emitting in the visible light. Increasing concentration of lead oxide in relation to boron oxide causes an increase in R (Eu3+), Y/B (Dy3+) and G/B (Tb3+) spectroscopic factors which correspond to the relative integrated luminescence intensities of 5D0-7F2/5D0-7F1, 4F9/2-6H13/2/4F9/2-6H15/2 and 5D4-7F5/5D4-7F6 transitions, respectively. Moreover, the influence of heavy metal oxide and activator concentration on luminescence decays from excited states of rare earth ions was examined in details.

Complexes of La(III), SM(III), Tb(III), Dy(III), Ho(III) and Er(III) Ions with Morin

75%

Kopacz M. , Woźnicka E.

2004

tom Vol. 78 / nr 4

521-528

New solid complex compounds of La(III), Sm(III), Tb(III), Dy(III), Ho(III) and Er(III) ions with morin were obtained. They were characterized by elemental analysis, thermogravimetric studies and spectrophotometric determination of metal ions. The molecular formulae of the compounds are: Ln(C15H9O7)3_nH2O, where n = 6 forLa,Sm,Tb,Dy and n = 5 for Ho and Er. Low molar conductances of the complexes (which correspond to non-electrolytes) and the _-_* bands of ligand and the CT bands L_Min UV-VIS spectra of the methanol solutions of the complexes were established. On the basis of 13CNMR and IR spectra, it was supposed that morin was bound to the lanthanide ions via C(4)=O and C(3)-oxygen.

Luminescence of porous silicon and porous silicon encapsulated structures.

51%

Monastyrskii L. S. , Olenych I. B. , Parandii P. P.

2000

tom Vol. 30, nr 4

641-646

Spectroscopic properties of encapsulated porous silicon (PS) have been studied in detail. In order to investigate different heterostructures of porous silicon a complex of analysis methods such as photoluminescence (PL) electroluminescence (EL), cathodoluminescence (CL) and thermostimulated depolarisation (TSD) were applied. The process of light emission shows a tendency to decrease. This decrease varies for different kinds of luminescence. The EL intensity dynamics depends on polarization effects in porous silicon.

Porous glasses as a host for solid state tunable lasers in the visible as a means for fluorescence diagnostics and photodynamic therapy.

51%

Reisfeld R. , Yariv E.

2000

tom Vol. 30, nr 4

481-490

Lasers prepared by incorporation of the active dyes into porous glasses are described. The background of the use of lasers for photodynamic therapy and diagnostics is outlined. The role of hematoporphyrin and hypericin in creation of singlet oxygen which destroys the malignant tissues, is explained. The lasers, based on sol-gel technology, incorporated by several perylimide and pyrromethane dyes emit in the suitable range in which the hematoporphyrin is excited. These compact lasers may replace, in the future, the vapour and the liquid lasers. The synthesis and the spectroscopic properties of the laser are described.