Site selective spectroscopy and structural analysis of yttria-doped zirconias

Structural and optical properties of europium doped zirconia single crystals fibers grown by laser floating zone

“…40 The width of the 5 D 0 → 7 F 0 transition in ZrO 2 doped samples grown by different routes was also studied by other authors. 6,7,18 Particularly, site-selective spectroscopy measurements performed on the 5 D 0 → 7 F 0 transition 6,7 eliminated inhomogeneous broadening, revealing different Eu 3+ -centers in the samples. In order to investigate if LFZ grown doped fibers exhibit multiple europium related optical centers, PLE ͑Fig.…”

“…The 14 K and RT PLE spectra monitored at the 5 D 0 → 7 F 2 transition ͑606 nm͒ display the excitation paths for the observation of the Eu 3+ luminescence. The narrower lines are ascribed to several intra-4f 6 transitions between the ground state 7 F to the excited states 5 D, 5 L, and 5 G multiplets, as labeled in Fig. 5.…”

“…Dexpert-Ghys et al, 6 in their work on yttria-doped zirconia ceramics, have shown the PL spectra of Eu 3+ ions in ZrO 2 samples with different monoclinic, tetragonal and cubic polymorphs. Our data shown in Fig.…”

“…In fact, the visible and infrared transitions of several lanthanide ions in bulk, microstructured, and nanostructured zirconia polymorphs processed by different routes have been exploited by different research groups for potential applications as solid state lighting and displays. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Indeed, associated with the high energy bandgap, the low phonon energy resulting from the small stretching frequency ͑470 cm −1 ͒ exhibited by ZrO 2 foresees a high yield of the intra-4f n transitions from the RE doped zirconia, [14][15][16][21][22][23][24][25] a suitable host material for optical applications such as optical active waveguides.…”

“…28 Regardless the synthesis technique and polytype in zirconia host doped with europium ions, optical activation was achieved, allowing the observation of the 5 D 0,1 → 7 F J transitions mainly in nano/micro polycrystalline samples. 6,7,14,18,19,21,23 In order to take advantage of the potentialities of Eu 3+ ions for optical applications in zirconia hosts, a deep knowledge of its behavior in single crystal material is required. However, it is well known that the growth of zirconia single crystal is a hard task, considering its high melting temperature.…”