Luminescence of cadmium fluoride doped with rare-earth ions

Abstract

Absorption, excitation and emission spectra of cadmium fluoride crystals doped with rare-earth ions were investigated. In contrast to alkaline-earth fluorides the absorption spectra due to 4f - 5d transitions of Ce${}^{3+}$, Pr${}^{3+}$ and Tb${}^{3+}$ ions are broadened. No 5d-4f emissions were observed. These prove that 5d(e${}_g$) levels of rare earth ions lie in conduction band of CdF${}_2$ crystal. Emission spectra of Tb${}^{3+}$ show the group of 4f-4f ${}^5$D${}_4$-${}^7$F${}_j$ lines in contrast to other alkaline-earth fluorides where emission due to ${}^5$D${}_3$-${}^7$F${}_j$ transitions is also observed. The absence of the emission is due to position of ${}^5$D${}_3$ level within condution band. Among the all measured crystals doped with impurity ions (Pr, Nd, Eu, Ho, Tb, Tm, Yb, Ga, In or Mn), the CdF${}_2$ doped with Pr${}^{3+}$, Tb${}^{3+}$, or Mn${}^{2+}$ ions have the highest light outputs under x-ray excitation.

presented on conference SCINT2013

References in corpus (2)

• Location of the Energy Levels of the Rare-Earth Ion in BaF2 and CdF2
• Scintillation properties of pure and Ce${}^{3+}$-doped SrF${}_2$ crystals

Cited by in corpus (1)

• Spectroscopy of divalent rare earth ions in fluoride crystals