Journal
JOURNAL OF RARE EARTHS
Volume 36, Issue 9, Pages 939-945Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jre.2018.03.015
Keywords
Visible-light excitation; Visible luminescence; Near-infrared luminescence; Lanthanide complexes-functionalized; Ordered mesoporous titania; Rare earths
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Funding
- National Natural Science Foundation of China [21571125, 21471144]
- National Key R&D Program of China [2016YFE0114800]
- State Key Laboratory of Rare Earth Resource Utilization [RERU2016013]
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Recently, much attention has been paid to the lanthanide luminescent materials based on the visiblelight sensitization for their potential applications in the fields of bio-imaging and optical devices. In this work, the lanthanide complexes have been covalently bonded to the ordered mesoporous titania (OMT) matrix, and the resulting titania-based hybrid ordered mesoporous materials (named as LnDB-OMT, Ln = Eu, Sm, Yb, Nd) were characterized by using Fourier-transform infrared (FT-IR) spectroscopy, small-angle X-ray powder diffraction (SAXD), N-2 adsorption-desorption isotherms, transmission electron microscopy (TEM), fluorescence spectroscopy, and thermogravimetric analysis. Generally, exciting with visible light is advantageous over UV excitation. Of importance here is that, under excitation with visible light, the LnDB-OMT all show characteristic visible (Eu3+, Sm3+) as well as nearinfrared (5m(3+), Yb3+, Nd3+) luminescence of the corresponding Ln(3+) ions (multicolor emission covered from 500 to 1400 nm spectral region), which is attributed to the energy transfer from the ligands to the Ln(3+) ions via an antenna effect. (C) 2018 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
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