Effect of symmetry reduction on the electronic transitions in polytypic GdAl3(BO3)4

Eu:Tb crystals

K. Lengyel, E. Beregi, I. Földvári, G. Corradi, L. Kovács, P. Solarz, W. Ryba-Romanowski

Research output: Contribution to journalArticle

Abstract

The existence of a recently described monoclinic phase (C2/c, Z = 8) (Beregi et al., 2012) in addition to the well-known Huntite type rhombohedral (R32) polytypic modification of the GdAl3(BO3)4 (GAB) crystal at room temperature provides a unique possibility to investigate the incorporation of rare earth dopants into slightly modified crystal lattice by spectroscopic methods. In these characteristic GAB structures the dopant ions, e.g. Tb3+ or Eu3+, possess slightly different neighbor geometries and local symmetries. The Tb3+: 7F65D4 and Eu3+: 7F0,1,25D0,1,2 electronic transitions were successfully identified in the absorption spectra using polarization, concentration and temperature dependent measurements in both polytypic modifications. The positions of the investigated Tb lines are shifted by up to 10 cm-1 due to symmetry changes. In addition, some of the Eu lines show splittings of about 4-30 cm-1 as a consequence of the change of the local environment. From the room temperature absorption measurements some of the low energy crystal field levels of 7F and 5D states of the Eu3+ ions were successfully determined for both modifications.

Original languageEnglish
Pages (from-to)30-33
Number of pages4
JournalOptical Materials
Volume53
DOIs
Publication statusPublished - Mar 1 2016

Fingerprint

Crystals
symmetry
Doping (additives)
electronics
Ions
crystals
room temperature
Electron transitions
crystal lattices
Crystal lattices
Temperature
Rare earths
crystal field theory
Absorption spectra
ions
rare earth elements
Polarization
absorption spectra
Geometry
polarization

Keywords

  • Absorption
  • Electronic transition
  • Europium
  • GdAl(BO)
  • Polytypism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Computer Science(all)

Cite this

Effect of symmetry reduction on the electronic transitions in polytypic GdAl3(BO3)4 : Eu:Tb crystals. / Lengyel, K.; Beregi, E.; Földvári, I.; Corradi, G.; Kovács, L.; Solarz, P.; Ryba-Romanowski, W.

In: Optical Materials, Vol. 53, 01.03.2016, p. 30-33.

Research output: Contribution to journalArticle

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