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Effect of uniaxial stress on luminescence of undoped and thallium-doped KI and RbI crystals
| Content Provider | Scilit |
|---|---|
| Author | Babin, V. Bekeshev, Amirbek Elango, A. Kalder, K. Maaroos, A. Shunkeev, K. Vasil'chenko, E. Zazubovich, S. |
| Copyright Year | 1999 |
| Description | Journal: Journal of Physics: Condensed Matter The effect of uniaxial stress applied at various temperatures along the (100) crystal axis on the self-trapped exciton (STE) and impurity-induced luminescence has been studied for pure and $Tl^{+}$, $Na^{+}$-containing KI and RbI crystals under excitation in the exciton and band-to-band absorption region as well as under x-ray excitation. An increase of the intrinsic/extrinsic emission intensity ratios has been observed and explained by the stress-induced (i) enhancement of the self-trapping efficiency of electronic excitations and the decrease of their migration length and (ii) suppression of the nonradiative decay of excitons into stable radiation defects. A strong influence of the uniaxial stress on the structure of the STE adiabatic potential energy surface has been detected in RbI which is evident in the stress-induced increase of the $E_{x}$/π and, particularly, of the $σ/E_{x}$ emission intensity ratios. This effect has been connected with the increase in the energy barriers between various STE configurations in the compressed crystal lattice. The dependence of the on-centre STE emission intensity in alkali halides on the distance between the nearest lattice anions and on their size has been discussed. |
| Related Links | http://iopscience.iop.org/article/10.1088/0953-8984/11/10/016/pdf |
| Ending Page | 2317 |
| Page Count | 15 |
| Starting Page | 2303 |
| ISSN | 09538984 |
| e-ISSN | 1361648X |
| DOI | 10.1088/0953-8984/11/10/016 |
| Journal | Journal of Physics: Condensed Matter |
| Issue Number | 10 |
| Volume Number | 11 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 1999-01-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Physics: Condensed Matter Condensed Matter Physics Potential Energy Surface |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Materials Science |
