Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 341, Issue 1-3, Pages 16-20Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2004.05.005
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Various photoluminescence (PL) methods were used to investigate the blue-green luminescence from mesoporous MCM-48 molecular sieves. The blue-green luminescence intensity is enhanced after rapid thermal annealing. The surface properties of the mesoporous MCM-48 molecular sieves reveal that the generation of twofold coordinated Si centers and non-bridging oxygen hole centers is responsible for this enhancement. Studies of PL following rapid thermal annealing, polarized PL and PL excitation strongly suggest that a triplet-to-singlet transition of twofold-coordinated silicon centers is responsible for the blue-green luminescence in mesoporous MCM-48 molecular sieves. (C) 2004 Elsevier B.V. All rights reserved.
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