Sankar, R. (2008) Efficient blue luminescence in Ce3þ-activated borates, A6MM0(BO3)6. Solid State Sciences, 10 (12). pp. 1864-1874. ISSN 1293-2558

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Photoluminescence studies on the Ce3þ-activated borates of the type Sr6MGa(BO3)6 [A ¼ Sr; M¼ La, Gd, Lu; M0 ¼ Ga; Ce3þ at the M-site], Sr6YAl(BO3)6 [A ¼ Sr; M¼ Y; M0 ¼ Al; Ce3þ at the Y-site], LaSr5YMg(BO3)6 [A ¼ La, Sr; M¼ Y; M0 ¼ Mg and Ce3þ at the La3þ-site] have been carried out for the first time and the results are presented here. All these compounds have been synthesized by the solid state reaction under reducing atmosphere and characterized by powder XRD, TG/DT, density, particle size, SEM, FT-IR and photoluminescence techniques. The photoluminescence of Sr6LaGa(BO3)6 activated with low and high Ce3þ concentrations has been studied. The luminescence of Ce3þ ions substituted at the larger (Gd3þ) and smaller (Lu3þ) ionic sites have been discussed. Two new compounds Sr6CeGa(BO3)6 and CeSr5YMg(BO3)6 have also been synthesized and studied. The photoluminescence studies show that under excitation with 254 and 355 nm, all these compounds display efficient blue emission in the region around 400e420 nm. The luminescence properties of these hexaborates under 254 nm excitation are similar to the known blue lamp phosphors Ca5(PO4)3F:Sb3þ, Sr2P2O7:Eu2þ, Sr5(PO4)3Cl:Eu2þ and the luminescence under 355 nm excitation are similar to the known blue TV phosphor ZnS:Agþ. Thus, the borate phosphors can be used as blue components in low pressure mercury vapor (lpmv) lamps and in television tubes.

Item Type: Article
Uncontrolled Keywords: Cerium; Luminescence; Hexaborates
Subjects: Electrochemical Materials Science
Depositing User: ttbdu cecri
Date Deposited: 31 Mar 2012 10:42
Last Modified: 31 Mar 2012 10:42

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