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Indexed by:期刊论文

Date of Publication:2007-12-01

Journal:JOURNAL OF RARE EARTHS

Included Journals:SCIE、ISTIC

Volume:25

Issue:,SI

Page Number:305-309

ISSN No.:1002-0721

Key Words:Sr2MgSi2O7; Sr3MgSi2O8; Gd3+; luminescent; afterglow; rare earths

Abstract:Three alkaline earth silicate phosphors: Sr2MgSi2O7: Eu, Dy, Gd, Sr3MgSi2O8 : Eu, Dy, Gd and Sr2MgSi2O7: Eu, Dy were prepared and their luminescent properties were investigated. The Photoluminescence (PL) measurements indicated that the phosphors gave a longer emitting phosphorescence phenomenon by comparing with those without Gd2O3 activator, in which a better afterglow characteristic was observed by adding Gd2O3 to the phosphors. While little influence on the structure of luminescent materials was observed via XRD spectra, and obvious emission wavelength shift was exhibited due to the differences in the structure parameters of the two hosts. The results revealed that the improvement was due to nonequivalent substitution to produce more e-traps, and energy transfer from Gd3+ to Dy3+, to boost the performance of Sr2MgSi2O7: Eu, Dy phosphor. Role of Gd3+ co-doped into Sr2MgSi2O7: Eu, Dy matrix and the possible long-lasting phosphorescence progress were discussed.