Photoluminescence of ZnBeMnSe solid solutions
| Autor: | Franciszek Firszt, A. Marasek, Karol Strzałkowski |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Manganese emission
Materials science Photoluminescence Band gap Biophysics chemistry.chemical_element 02 engineering and technology Manganese 01 natural sciences Biochemistry Condensed Matter::Materials Science Crystal field theory 0103 physical sciences Photoluminescence excitation Laser power scaling 010306 general physics ZnBeMnSe mixed semiconductors General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics chemistry Excited state Atomic physics II-VI crystals 0210 nano-technology Luminescence Excitation |
| Zdroj: | Journal of Luminescence. 184:29-37 |
| ISSN: | 0022-2313 |
| Popis: | In this paper optical properties of Zn1-x-yBexMnySe mixed semiconductors were studied as a function of both, temperature and excitation power. The crystals under investigation were grown by the high-pressure, high-temperature vertical Bridgman technique within the range of the composition 0.05≤x, y≤0.2. Photoluminescence spectra for the lowest content of Mn and Be exhibit character typical for II-VI semiconductors together with intensive yellow-orange manganese emission. Evolution of the excitonic emission as the function of temperature allowed determining the energy gap of the investigated semiconductors. Absorbance and photoluminescence excitation spectra confirmed crystal field splitting of excited atomic terms of manganese ions into the states, denoted according to the crystal field theory in the case of tetrahedral symmetry. Temperature and laser power dependences of luminescence showed anomalous behavior of the manganese emission. It turned out that the position of the Mn2+ related luminescence band does not change monotonically with the variation of the temperature or the excitation power. Finally, switching of the manganese emission has been observed. By increasing laser power of exciting radiation, the Mn-related emission could be quenched by almost two orders in magnitude. This effect was especially strong at low temperature and it was fully reversible. |
| Databáze: | OpenAIRE |
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