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The luminescence properties of dysprosium ions in silica xerogel doped with Gd1.6Dy0.4(WO4)3

Grobelna B., Synak A., Bojarski P.

Optica Applicata

2012

Vol. 42, nr 2

337-344

The new material consisting of Gd1.6Dy0.4(WO4)3 incorporated into silica xerogel was prepared via the coprecipitation method. The luminescence properties of the studied material were analyzed by means of emission and excitation spectra, including the result of luminescence lifetimes of Dy(III) ion. The enhanced yellow emission due to the excitation energy transfer from WO42- group to Dy(III) ion upon excitation at exc = 240 nm is the main result of this paper.

The effect of WO42– group in xerogels doped with Ln2–xPrx(WO4)3 where Ln = La, Gd

Grobelna B., Bojarski P.

Optica Applicata

2010

Vol. 40, nr 2

359--366

We present a synthesis of highly efficient xerogels doped with Ln 2–x Prx(WO4)3, where Ln = La or Gd as novel phosphors. For comparison, the synthesis of xerogels doped only with Pr(III) and La(III) ions was made. The photoluminescence properties of Pr(III) ions in xerogels were studied by means of luminescence spectroscopy. In particular, an efficient energy transfer from WO42– to Pr(III) ions was observed and demonstrated by their enhanced luminescence intensity. Especially interesting seems to be strong red acceptor emission observed upon excitation at 240 nm (donor excitation). Therefore, 4f–4f emission makes the system usable for red phosphor applications. Additionally, the emission intensity of the materials was improved by reducing concentration of such quenchers as water molecules and OH groups by the thermal treatment.

Energy transfer from Yb to X (X = Tm, Er) in lead borate glasses

Pisarska J., Ryba-Romanowski W., Dominiak-Dzik G., Goryczka T., Pisarski W.A.

Optica Applicata

2005

Vol. 35, nr 4

837-842

Energy transfer processes in lead borate glasses doubly doped with Yb-Tm and Yb-Er have been investigated at room temperature under excitation of Yb at 975 nm. The non-resonant energy transfer from 2F5/2 state of Yb to 3H5 state of Tm results in up-converted emission at 850 nm due to the 3H4-3H6 transition of thulium ions. The nearly resonant transfer from 2F5/2 state of Yb to 4I11/2 state of Er results in green up-conversion and near-infrared emission, which correspond to the 4S3/2-4I15/2 and 4I13/2-4I15/2 transitions of erbium ions, respectively. High Yb concentration in both co-doped samples is required for optimal energy transfer efficiency (h > 90%). Results with the singly Yb-doped samples are also presented to clarify the energy transfer process.