Unexpected 700 nm upconversion emission for Cs2NaYbCl6 and its co-doped hexachloroelpasolites
Abstract
Excitation of samples of the elpasolite Cs2NaYbCl6, prepared using high purity Yb2O3, by an infrared laser at temperatures below ∼100 K produces a strong, structured emission near 700 nm. The emission is also observed for samples co-doped with other rare earth ions and it exhibits the characteristic power-intensity dependence of a 2-photon process. Analysis of the vibronic structure indicates that it can be assigned to one, and not several, electronic transitions. However, the transition energy does not correspond to any of the electronic transitions associated with Yb3+ or Yb2+. From evidence displayed in the electron spin resonance spectrum and from the spectral interpretation, the emission is associated with the MnCl62- ion.
- Publication:
-
Journal of Luminescence
- Pub Date:
- July 2019
- DOI:
- 10.1016/j.jlumin.2019.03.017
- Bibcode:
- 2019JLum..211...20W
- Keywords:
-
- Upconversion;
- Lanthanide;
- Manganese;
- Ytterbium;
- Elpasolite