Photo-Induced Thermally Stimulated Depolarization Current (TSDC) in Natural and Synthetic Alexandrite (BeAl2O4:Cr3+)
| Autor: | Elisabeth Mateus Yoshimura, Luis Vicente de Andrade Scalvi, Rosa Maria Fernandes Scalvi, Ana Regina Blak, N.M. Trindade |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Photoluminescence
Argon Active laser medium Materials science business.industry Chrysoberyl Analytical chemistry chemistry.chemical_element 02 engineering and technology Synthetic alexandrite 021001 nanoscience & nanotechnology Laser Ion law.invention 030207 dermatology & venereal diseases 03 medical and health sciences 0302 clinical medicine chemistry law Optoelectronics Continuous wave 0210 nano-technology business |
| Zdroj: | Materials Sciences and Applications. :881-894 |
| ISSN: | 2153-1188 2153-117X |
| Popis: | The investigation of electrical properties in alexandrite (BeAl2O4:Cr3+) in synthetic and natural forms is presented in this paper. Alexandrite is a rare and precious mineral that changes color according to the light incident on it. In the synthetic form, it is used technologically as an active laser medium. The electrical characterization was obtained using the Thermally Stimulated Depolarization Current (TSDC) technique, an interesting tool to study the behavior of impurities in insulators. Alexandrite presented the electric dipole relaxation phenomenon, both in natural and in synthetic samples. It was possible to observe TSDC bands for the synthetic sample at around 170 K, and at around 175 K for the natural sample. Besides, photo-induced TSDC measurements were performed through the excitement of the samples by using a continuous wave argon laser. In addition, photoluminescence measurements were performed to verify in advance whether the laser light would be absorbed by the sample, and in order to complement the photo-induced TSDC measurements analysis. The results of photo-induced TSDC experiments have contributed to the understanding of the TSDC bands behavior: the results obtained with the technique suggest that there is an effective participation of Cr3+ ions in the formation of TSDC bands because they were more intense when the sample was exposed to the argon laser beam. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|