Preparing, Characterizing, and Investigating Luminescent Properties of a Series of Long-Lasting Phosphors in a SrO–Al2O3 System: An Integrated and Inquiry-Based Experiment in Solid State Chemistry for the Undergraduate Laboratory
| Autor: | Li Jia, Xi-Ping Jing, Kai-Guo Ma, Hai-Hong Wang, Yan-Zi Ma |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Solid-state chemistry
Photoluminescence Precipitation (chemistry) Chemistry 05 social sciences Analytical chemistry 050301 education Phosphor 02 engineering and technology General Chemistry Crystal structure 021001 nanoscience & nanotechnology Fluorescence spectroscopy Education Chemical engineering 0210 nano-technology Luminescence 0503 education Intensity (heat transfer) |
| Zdroj: | Journal of Chemical Education. 94:1157-1162 |
| ISSN: | 1938-1328 0021-9584 |
| DOI: | 10.1021/acs.jchemed.6b00211 |
| Popis: | An integrated and inquiry-based experiment on solid state chemistry is applied to an inorganic chemistry lab course to provide insight into the characteristics of the solid phase reaction. In this experiment, students have the opportunity to synthesize long-lasting phosphors with formula xSrO·yAl2O3:Eu2+, Dy3+, by means of precipitation and high temperature methods, and to characterize them by powder X-ray diffractometry. The luminescent properties of the phosphors are also suitable for investigation by student research teams with the assistance of solid fluorescence analysis. With a change in the Sr/Al ratio of strontium aluminates, the phosphors show distinct emission bands, and with a change in the content of Dy in a certain range, the different data of luminescence intensity and decay time can be obtained. By analyzing the crystal structures and photoluminescence mechanism of products, students can better understand abstract concepts of luminescent solid materials, including nonstoichiometric compound... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|