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| dc.contributor.author | BIRHAN, DEGU | |
| dc.date.accessioned | 2019-10-11T03:18:39Z | |
| dc.date.available | 2019-10-11T03:18:39Z | |
| dc.date.issued | 2019-10-11 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/9845 | |
| dc.description.abstract | Abstract In this project, the calculated energy band gap and particle size of the ZnS nanoparticles from UV-vis and photoluminescence data using Brus equations were compared. It shown in the calculation the energy band gap increased and the particles size decreased as the Mn and Cr dopant concentration increased. The particle size and energy band gap of undoped ZnS nanoparticle was 19.14nm and 3.59 eV, respectively. However, using UV-vis data, the energy band gap increased from 3.59 eV to 3.61 eV and the particles size decreased fron 14.82 nm to 12.53 nm as the Mn concentration increased from 2 to 10%. The calculated energy band gap and particle size of the ZnS nanoparticle from the PL spectra data using Brus equations. From the calculation data the energy band gap increased and the particle size decreased as the Mn dopant concentration increased. The particle size and energy band gap of undoped ZnS nanoparticle was 3.66nm and 3.74eV, respectively. However, using PL spectra data, the energy band gap increased from 3.74eV to 3.766eV and the particle size decreased from 3.66nm to 3.486nm as the manganese (Mn) concentration increased from 10% to 40%. When the chromium doped in different concentration the energy band gap and particle size also varies. From the calculated energy band gap and particles size of the ZnS nanoparticles from UV-visible and photolumincence data using Brus were compaired. The undoped chromium the energy band gap and the particle size was 3.804eV and 7.3368nm respectivly. However, using UV-vis data the energy band gap increased from 3.804eV to 4.026eV and the particle size decresed from 7.3368nm to 5.08nm as the Cr concentration from 0.000% to 0.03%. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Physics | en_US |
| dc.title | STUDY ON THE OPTICAL PROPERTIES OF Mn AND Cr DOPED AND UNDOPED ZINC SULFIDE NANOPARTICLES | en_US |
| dc.type | Thesis | en_US |
