| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1489144 | Materials Research Bulletin | 2012 | 6 Pages |
Transparent and uniform LiLa(1−x)Eux(WO4)2 single-crystalline fibers where x = 0.005, 0.01, 0.03, 0.05, 0.07, 0.1, 0.15, 0.2, 0.25 and 1.0, with an average of 20–40 mm length were obtained by the micro-pulling-down method aiming structural and optical characterization. The optimum pulling rate was found to depend on the difference between alkali and rare earth ionic radii. Rietveld analysis from X-ray diffraction data and excitation spectroscopy at room temperature were applied to investigate the lattice changes due to the Eu3+ incorporation in the host. LiLa(1−x)Eux(WO4)2 crystal fibers present red emission due to the electric dipole 5D0 → 7F2 transition under 395 nm excitation showing a concentration quenching around 20 mol% of doping. The excitation spectra of the 7F0 → 5D0 transition show small changes in the Eu3+ surroundings as function of dopant concentration.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Transparent and uniform LiLa(1−x)Eux(WO4)2 single-crystalline fibers were grown by the micro-pulling-down method. ► Alkali and rare earth ionic radii influence the pulling rate on the growth. ► Eu incorporation in LiLa(WO4)2 induces local distortions in the crystalline lattice. ► LiLa(1−x)Eux(WO4)2 single-crystalline fibers present intense red emission under 395 nm excitation. ► Concentration quenching observed in the emission around 20 mol% of Eu doping.
