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Download fileNear Infrared and Visible Luminescence from Xerogels Covalently Grafted with Lanthanide [Sm3+, Yb3+, Nd3+, Er3+, Pr3+, Ho3+] β‑Diketonate Derivatives Using Visible Light Excitation
journal contribution
posted on 2016-02-18, 16:46 authored by Lining Sun, Yannan Qiu, Tao Liu, Jin Z. Zhang, Song Dang, Jing Feng, Zhijuan Wang, Hongjie Zhang, Liyi ShiA series
of ternary lanthanide β-diketonate derivatives covalently bonded
to xerogels (named as Ln-DP-xerogel, Ln = Sm, Yb, Nd, Er, Pr, Ho)
by doubly functionalized alkoxysilane (dbm-Si) was synthesized in
situ via a sol-gel process. The properties of these xerogel materials
were investigated by Fourier-transform infrared (FT-IR) spectroscopy,
field-emission scanning electron microscopy (FE-SEM), diffuse reflectance
(DR) spectroscopy, thermogravimetric analyses, and fluorescence spectroscopy.
The data and analyses suggest that the lanthanide derivatives have
been covalently grafted to the corresponding xerogels successfully.
Of importance here is that, after excitation with visible light (400–410
nm), the xerogels all show characteristic visible (Sm3+) as well as near-infrared (NIR; Sm3+, Yb3+, Nd3+, Er3+, Pr3+, Ho3+) luminescence of the corresponding Ln3+ ions, which is
attributed to the energy transfer from the ligands to the Ln3+ ions via an antenna effect. Exciting with visible light is advantageous
over UV excitation. Furthermore, to the best of our knowledge, it
is the first observation of NIR luminescence with visible light excitation
from xerogels covalently bonded with the Sm3+, Pr3+, and Ho3+ derivatives. Compared to lanthanide complexes
(Ln = Er, Nd, Yb) functionalized periodic mesoporous organosilica
(PMO) materials that exhibit similar optical properties reported in
our previous work, the Ln-DP-xerogel (Ln = Sm, Yb, Nd, Er, Pr, Ho)
in this case offer advantages in terms of ease of synthesis and handling
and potentially low cost for emerging technological applications.
Development of near-infrared luminescence of the lanthanide materials
with visible light excitation is of strong interest to emerging applications
such as chemosensors, laser systems, and optical amplifiers.