Roles of Eu2+, Dy3+ ions in persistent luminescence of strontium aluminates phosphors

Autor:	Lü Xingdong, Minjuan Zhong, Renqin Wang
Rok vydání:	2008
Předmět:	Strontium Materials science Photoluminescence Doping Strontium aluminate chemistry.chemical_element Phosphor Photochemistry Electron transfer chemistry.chemical_compound Persistent luminescence chemistry General Materials Science Luminescence Nuclear chemistry
Zdroj:	Journal of Wuhan University of Technology-Mater. Sci. Ed.. 23:652-657
ISSN:	1993-0437 1000-2413
Popis:	The polycrystalline Eu2+ and Dy3+ co-doped strontium aluminates SrAl2O4: Eu2+, Dy3+ with different compositions were prepared by solid state reactions. The UV-excited photoluminescence, persistent luminescence and thermo-luminescence were studied and compared. Results show that the doped Eu2+ ion in SrAl2O4: Eu2+, Dy3+ phosphors works as not only the UV-excited luminescent center but also the persistent luminescent center. The doped Dy3+ ion can hardly yield any luminescence under UV-excitation, but effectively enhance the persistent luminescence and thermo-luminescence of SrAl2O4: Eu2+. Dy3+ co-doping can help form electron traps with appropriate depth due to its suitable electro-negativity, and increase the density and depth of electron traps. Based on above observations, a persistent luminescence mechanism, electron transfer model, is proposed and illustrated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0beddc79812286b096cd092b2dfdfef1 https://doi.org/10.1007/s11595-007-5652-7 Zobrazit plný text záznamu Full text from SpringerLink