The influence of the conduction band of BaCl2 on the thermal quenching of the Tm2+ 4f125d1→4f13 and 4f13→4f13 luminescence in orthorhombic BaCl2:Tm2+/3+
The positioning of the Tm2+ 4f125d1 and 4f13 energy levels as relative to the conduction band of the orthorhombic BaCl2 host lattice has been determined. Therefore, the energies of the Tm2+ 4f125d1-and excited 4f13-level were retrieved, as relative to the Tm2+ 4f13 ground state. In addition, the ene...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-02-01
|
| Series: | Optical Materials: X |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590147824001013 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The positioning of the Tm2+ 4f125d1 and 4f13 energy levels as relative to the conduction band of the orthorhombic BaCl2 host lattice has been determined. Therefore, the energies of the Tm2+ 4f125d1-and excited 4f13-level were retrieved, as relative to the Tm2+ 4f13 ground state. In addition, the energy for exciton creation in the orthorhombic BaCl2 host lattice was established, from which the bandgap energy was determined. This value was found to correspond quite well to known literature values. Furthermore, the Tm3+-Cl- charge transfer transition was determined, from which the energy difference between the Tm2+ 4f13 ground state and the top of the BaCl2 valence band was deduced. A host referred binding energy scheme deduced for BaCl2:Tm2+ then showed that the lowest energy Tm2+ 4f125d1-levels are positioned 0.3–0.5 eV below the BaCl2 conduction band. Room temperature photo-excitation into this level will then most likely result in thermal ionization effects that have an impact on the Tm2+ 4f125d1→4f13 and 4f13→4f13 luminescence and corresponding quantum yield. |
|---|---|
| ISSN: | 2590-1478 |