Eu2+ luminescence in MAl3BO7 aluminoborates (M=Ca, Sr, Ba)

Jagannathan, R and Rao, RP and Kutty, TRN (1992) Eu2+ luminescence in MAl3BO7 aluminoborates (M=Ca, Sr, Ba). In: Materials Research Bulletin, 27 (4). pp. 459-466.

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Abstract

Three new aluminoborates having the composition MAl3BO7, where M = Ca,Sr or Ba, have been prepared. X-ray diffraction data indicate that all the phases are monoclinic, with close structural similarity to the meta stable aluminate, SrAl4O7. These aluminoborates are good host lattices for Eu2+ luminescence. The emission spectra show multiple bands in the blue region, corresponding to two inequivalent sites in each case, with one of them having quantum efficiency greater-than or equivalent to 75%. In the case of SrAl3BO7:Eu2+, the d–f band emission dominates at 300 K whereas at 77 K both d–f band and f–f line emissions are observed. Efficient Eu2+→Mn2+ energy transfer is observed in MAl3BO7 leading to strong green emission of Mn2+in the tetrahedral sites.aluminoborates; europium

Item Type:	Journal Article
Publication:	Materials Research Bulletin
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	24 Jan 2011 08:57
Last Modified:	24 Jan 2011 08:57
URI:	http://eprints.iisc.ac.in/id/eprint/35222

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