White emitting GeO2-PbO-Bi2O3-SrF2 glass and nano-glass ceramics co-doped with Eu3+, Tb3+ and Tm3+ ions
Andrzej Marian Kłonkowski , Wiesław Wiczk , Karol Szczodrowski , Dorota Wileńska , Natalia Górecka , Małgorzata Szyszkowska
AbstractTb3+ and Tm3+ ions. Besides for comparison glasses singly doped with Eu3+, Tb3+ or Tm3+ and a glass doubly co-doped with Eu3+ and Tb3+were studied. The singly Tb3+ doped glass did not exhibit cross-relaxation effect. In the case of the di-doped glass energy transfers Tb3+ → Eu3+ was certified. Then, for the tri-doped glass energy transfers Tb3+ → Eu3+ and in reverse Eu3+ → Tb3+ as well as Tm3+ → Tb3+ were observed. In the emission spectrum of the triply co-doped devitrified glass, similarly as in the other Eu3+ doped glasses, band peaked at 612 nm ascribed to 5D0 → 7F2 transition in Eu3+ was dominated above the 5D0 → 7F2 band. It suggests that the majority of Eu3+ (and very probably also Tb3+ and Tm3+) ions were incorporated into the residual vitreous phase of the glass-ceramics. Reduced luminescence lifetimes τ1 of the Tb3+ and Tm3+ dopants in the triply co-doped glass in comparison to τ values of these dopants singly embedded in the glasses additionally confirms presence of the energy transfer effects in the tri-doped material. Devitrification of the tri-doped glassy phosphor did not improve its white color emission.
|Other language title versions|
|Journal series||Journal of Alloys and Compounds, ISSN 0925-8388|
|Publication size in sheets||0.5|
|Keywords in English||glass, glass-ceramics, lanthanide ions, luminescence, energy transfer, white phosphor|
|Score|| = 35.0, 20-12-2017, ArticleFromJournal|
= 35.0, 20-12-2017, ArticleFromJournal
|Publication indicators||: 2016 = 3.133 (2) - 2016=2.919 (5)|
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