Structure and Fluorescence Quenching of Li2O-MgO-Al2O3-SiO2 GlassesDoped with Trivalent Cerium

doi:10.15541/jim20130662

Abstract

Abstract:

20Li₂O-5MgO-20Al₂O₃-55SiO₂glass doped with different concentrations of Ce³⁺ions was synthesized by using melt-quenching method. The glass density as a function of Ce³⁺ ions doping concentration was tested by Archimedes’ method. The structural characteristics of Ce³⁺-doped 20Li₂O-5MgO-20Al₂O₃-55SiO₂were detected by using X-rays diffraction (XRD), high resolution transmission electron microscope (HRTEM) techniques. The photoluminescence excitation (PLE) and emission (PL) spectra were recorded in a spectrofluorimeter by photon counting techniques. Results showed that 5d energy level of Ce³⁺ ion was splitted to five components under the strong crystal filed surrounding Ce³⁺ ions. The higher the doping concentration of Ce³⁺ ions, the higher the degree of non-crystalline configuration of lithium magnesium aluminosilicate glass was. With the increase of the degree of non-crystalline configuration, the splitting width of 5d energy level increased, resulting in the redshift of excitation and emission spectra apparently. The PL emission intensity first increased, and then decreased with the increase of Ce³⁺ ions doping concentration. The concentration quenching processes were found to be the key reason for the reduction of the PL emission efficiency.

Key words: Ce3+-doped concentration, Li2O-MgO-Al2O3-SiO2 glasses, 5d energy level splitting, concentration quenching

CLC Number:

TQ171

CHEN Yan-Ping, LUO De-Li, XU Qin-Ying, YANG Suo-Long, TANG Tao, WANG Xiao-Ying. Structure and Fluorescence Quenching of Li₂O-MgO-Al₂O₃-SiO₂ Glasses
Doped with Trivalent Cerium[J]. Journal of Inorganic Materials, 2014, 29(9): 967-971.

Figures/Tables 8

Table 1 Batch compositions of LMAS:xCe glasses

Glass samples	Composition/mol%
Glass samples	Li₂O	SiO₂	Al₂O₃	MgO	Ce₂O₃
LMAS:xCe	20	55	20	5	x=0, 0.25, 0.50, 0.80, 0.89, 1.00, 5.12, 10.24

Fig. 1 LMAS:xCe glass densities vs Ce2O3 content Inset is the photo of samples doped with 1.06mol%, 0.89mol%, 0.80mol% Ce2O3 from left to right

Fig. 2 XRD patterns of LMAS:xCe glasses

Fig. 3 Photoluminescence excitation and emission spectra of LMAS:0.89Ce glass, with the excitation and emission slit width of 8 nm and 12 nm

Fig. 4 Photoluminescence spectra of LMAS:xCe glasses under the excitation of 280 nm UV light

Fig. 5 HRTEM image of LMAS:5.12Ce galss

Table 2 The emission spectra parameters of LMAS:xCe glasses

Samples	Peak wavelength /nm	FWHM /nm	Integral intensity/% *
LMAS:0.25Ce	375.0	67.0	57.77±0.34
LMAS:0.50Ce	383.0	66.5	87.59±0.50
LMAS:0.80Ce	384.5	67.0	91.84±0.55
LMAS:0.89Ce	386.5	70.0	100.00±0.50
LMAS:1.00Ce	386.5	68.5	82.54±0.51
LMAS:5.12Ce	404.0	85.0	66.04±0.46
LMAS:10.24Ce	426.0	97.0	39.31±0.48

Fig. 6 Photoluminescence excitation spectra of LMAS:xCe glasses

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Structure and Fluorescence Quenching of Li₂O-MgO-Al₂O₃-SiO₂ Glasses
Doped with Trivalent Cerium

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