Luminescence properties of ZnGa₂O₄ and ZnAl₂O₄ spinels doped with Eu³⁺ and Tb³⁺ ions

Abstract

Spinel‐type ZnGa2O4 and ZnAl2O4 powders doped with Eu3+ and Tb3+ ions, including dual doping, have been prepared by solid phase reactions and by deposition from chemical solutions. XRD analysis demonstrates the high quality of spinel grains constituting the powder. The luminescence shows that the rare earth ions are incorporated in the defect regions at the grain boundaries. The emission spectra of the samples with europium are characterized by an intense emission in red region due to the 5D0 → 7F1,2 transitions of Eu3+ ions, whereas in the case of terbium the highest intensity corresponds to the green emission due to the 5D4 → 7F5 transitions of Tb3+ ions. The possibility to change the color of the emission from green to red by the variation of Tb and Eu doping concentration is demonstrated. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Synthesis and characterization of novel spinel Zn 1.114 La 1.264 Al 0.5 O 4.271 nanoparticles

“…The sharpest peak is observed at 2q z 33 (100%) and other sharp peaks are located at 2q z 23 (55%), 41 (43%), 47 (30%) and 59 (27%). Comparing the characteristic XRD patterns ZnAl 2 O 4 , ZnO [53] and La 2 O 3 [54] with that of Zn 1.114 La 1.264 Al 0.5 O 4.271 confirms that the XRD pattern for this new spinel material is specific which is different from those of the above mentioned oxides.…”

Fabrication and luminescence properties of one-dimensional ZnAl2O4 and ZnAl2O4: A3+ (A=Cr, Eu, Tb) microfibers by electrospinning method

“…ZnAl 2 O 4 has the symmetry of cubic, with a space group Fd3m and 8 formula units per unit cell [6]. Thirty two oxygen atoms occupy sites with C 3v symmetry forming a closely packed cubic lattice with 64 tetrahedral (T d ) and 32 octahedral (D 3d ) cation sites, only 8 tetrahedral and 16 octahedral of them are occupied by cations [7]. All Zn atoms occupy the tetrahedral sites (without inversion center), and Al atoms occupy the octahedral sites (with inversion center).…”

Characterization and optical properties of ZnGa2O4:Eu3+ nanophosphor grown by hydrothermal method

“…Methods for preparation of nanocrystalline ZnGa 2 O 4 phosphor doped with Eu 3+ ions are usually wet chemical methods, including sol-gel, precipitation, emulsion combustion, nonhydrolitic hot solution, hydrothermal method, etc. [15][16][17][18]. By our knowledge, up to day, the effect of Eu 3+ doping in the ZnGa 2 O 4 spinel structure grown by hydrothermal method is less studied.…”