Preparation and characterization of Nd doped gadolinium gallium garnet nanopowders and crystals

Abstract

The structural and optical features of gallium gadolinium garnet (GGG) nanopowders doped with neodymium were investigated. Nanopowders of GGG:Nd were prepared by modified sol-gel method using acetic acid as complexing agent. This way permitted to incorporate large amounts of dopant (up to 10 %) without destroying garnet structure. Small single crystals of Nd:GGG were grown by a µ-pulling down method and spectroscopic features of nanopowders and their single crystal counterparts were compared. It has concluded that the Nd 3+ ions are located preferentially in the same type of sites in crystal lattices of GGG:Nd nanopowders and their single crystal counterparts. In addition, it follows from the perfect agreement of emission wavelengths and line width recorded for nanopowders and single crystal samples that the crystal lattice of GGG in nanopowders is not distorted.

Optical nanothermometer based on the calibration of the Stokes and upconverted green emissions of Er3+ ions in Y3Ga5O12 nano-garnets

“…However, in the literature one can nd examples in which the experimental lifetimes for an electronic level of a RE 3+ ion introduced as dopant in a bulk matrix and its equivalent nanoparticle have been compared, and the radiative probabilities have been considered approximately equal. 34,35 For example, Lipińska et al 34 have calculated the lifetime of the 4 F 3/2 level of Nd 3+ ions in Gd 3 Ga 5 O 12 (GGG) nanopowder and crystal garnets, and they found comparable results between them, or V. I. Zhekov et al 35 in Y 3 Al 5 O 12 (YAG) crystal doped with Er 3+ ions have observed a similar behavior for the 4 I 13/2 / 4 I 15/2 transition. Although it Fig.…”

Nd:GGG Nanopowders by Microwave Gel Combustion Route and Sinterability Studies

“…This indicates substitution of gadolinium by neodymium. The lattice parameter increases because neodymium ion has bigger size than gadolinium ion 22 . Diffused reflectance spectra of Nd:GGG in Fig.…”

Composition and dissociation processes analysis in crystal growth of Nd:GGG by the Czochralski method

“…They have decreased the evaporation of molten Ga 2 O 3 by means of 10% CO 2 instead of O 2 in the atmosphere. The oxygen partial pressure increases with temperature; consequently, oxidation of iridium (Ir) crucible decreases [14]. Jia et al [15] have taken the polycrystalline Nd:GGG as starting material to produce the large size Nd:GGG crystal.…”