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Converting Eu3+ between defect sites in BaFCl for persistent spectral hole burning.

S T Li¹, G K Liu, W Zhao

¹Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

|December 13, 2007

Summary

Persistent spectral hole burning (PSHB) in Eu(3+)-doped BaFCl crystals shows laser-induced conversion between Eu(3+) ion sites. This non-reversible process requires heating to 150 K to erase the spectral holes.

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Area of Science:

Solid-state spectroscopy
Materials science
Optical physics

Background:

Persistent spectral hole burning (PSHB) is a spectroscopic technique used to study optical transitions in solids.
Europium (Eu3+) ions are often used as dopants in host materials for optical applications.
Understanding defect sites and their interactions is crucial for materials development.

Purpose of the Study:

To investigate persistent spectral hole burning in Eu3+-doped BaFCl crystals.
To identify the mechanism behind the observed PSHB effect.
To characterize the properties of Eu3+ ions at different lattice sites.

Main Methods:

Optical spectroscopy
Laser-induced persistent spectral hole burning
Low-temperature measurements (below 77 K)

Main Results:

PSHB was successfully demonstrated in the (7)F(0)-->(5)D(0) transition of Eu3+ in BaFCl.
Holes were burned at temperatures below 77 K for Eu3+ ions at two distinct lattice sites.
The PSHB mechanism was identified as laser-excitation-induced site-to-site conversion of Eu3+ ions.
The process was found to be irreversible, with hole erasure only occurring above 150 K.

Conclusions:

Laser excitation induces a non-reversible conversion between different Eu3+ defect sites in BaFCl.
The PSHB effect in this system is attributed to this site conversion mechanism.
The temperature dependence of hole erasure provides insights into the defect dynamics.