Preparing, Characterizing, and Investigating Luminescent Properties of a Series of Long-Lasting Phosphors in a SrO-Al[subscript 2]O[subscript 3] System: An Integrated and Inquiry-Based Experiment in Solid State Chemistry for the Undergraduate Laboratory

Autor/inn/en	Ma, Yan-Zi; Jia, Li; Ma, Kai-Guo; Wang, Hai-Hong; Jing, Xi-Ping
Titel	Preparing, Characterizing, and Investigating Luminescent Properties of a Series of Long-Lasting Phosphors in a SrO-Al[subscript 2]O[subscript 3] System: An Integrated and Inquiry-Based Experiment in Solid State Chemistry for the Undergraduate Laboratory
Quelle	In: Journal of Chemical Education, 94 (2017) 8, S.1157-1162 (6 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Ma, Yan-Zi)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
DOI	10.1021/acs.jchemed.6b00211
Schlagwörter	Undergraduate Students; Science Instruction; Inorganic Chemistry; Science Experiments; Laboratory Experiments; Experiential Learning; Active Learning; Inquiry; College Science; Climate + Suchen Sie Ihr Suchwort? Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Anorganische Chemie; Laboratory work; Laborarbeit; Experiental learning; Erfahrungsorientiertes Lernen; Aktives Lernen; Klima
Abstract	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·yAl[subscript 2]O[subscript 3]:Eu[superscript 2+], Dy[superscript 3+], 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 compounds, extrinsic point defects, crystalline fields in the solid state, band levels, and hole and electron transfer. (As Provided).
Anmerkungen	Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01