| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1618186 | Journal of Alloys and Compounds | 2010 | 4 Pages |
Abstract
The fundamental optical properties of dysprosium (Dy) doped strontium sulfide bulk samples for various dopant concentrations from 0.1 to 1.0Â at.% were investigated by X-ray diffraction (XRD), electron paramagnetic resonance spectroscopy (EPR), room temperature photoluminescence (PL), photoluminescence excitation (PLE) and diffuse reflectance spectroscopy (DRS). Investigations by electron paramagnetic resonance yielded the state of Dy in the sample as Dy3+. An additional ESR line due to F+ center was observed. The PL emission spectrum consisted of several intense lines and a number of weaker ones which were identified as transitions between energy levels of Dy3+. The optimum doping concentration for maximum intensity was found to be 0.25Â at.%. Blue shift of the absorption edge energy and red shift of the PLE spectrum were observed with increasing doping concentration. The former is due to Burstein-Moss (BM) effect and the latter is attributed due to the presence of band tailing states.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
E.I. Anila, M.K. Jayaraj,