Preparation and Down-conversion Luminescent Properties of Tb3+, Yb3+ Co-doped Sr2B2O5

doi:10.15541/jim20160122

Abstract

Abstract:

Tb³⁺ and Yb³⁺ co-doped Sr₂B₂O₅ phosphors were synthesized by conventional solid-state reactions. The obtained Sr₂B₂O₅: Tb³⁺, Yb³⁺ phosphors were characterized by X-ray diffraction (XRD) and photoluminescence (PL) spectra. XRD results show that all prepared phosphors can be readily indexed to pure monoclinic phase of Sr₂B₂O₅. The dominant excitation at 374 nm was observed among three strong excitation peaks located at 354, 374 and 487 nm monitored at 543 nm and 980 nm, by which Sr₂B₂O₅ phosphors could be considered as having a strong absorption in the near ultraviolet region of sunlight. Under the ultraviolet light excitation at 374 nm, the strong intensity of visible emission from Tb³⁺:⁵D₄→⁷F_J ( J = 6, 5, 4, 3), and near-infrared (NIR) emission from Yb³⁺ (²F_5/2→²F_7/2) were detected. The relationship between the luminescence spectra and Yb³⁺ doping content demonstrated the monoclinic Sr₂B₂O₅ exhibited the excellent quenching concentration.

Key words: Sr₂B₂O₅, Yb³⁺, Tb³⁺, down-conversion, luminescent material

CLC Number:

O614

DAI Zhi-Gang, LI You-Fen, LI Gang, YANG Ru. Preparation and Down-conversion Luminescent Properties of Tb³⁺, Yb³⁺ Co-doped Sr₂B₂O₅[J]. Journal of Inorganic Materials, 2016, 31(10): 1081-1086.

Figures/Tables 11

Fig. 1 XRD patterns of the samples prepared with (a) k=1 and (b) k=1.03

Fig. 2 XRD patterns of Sr2B2O5:Tb3+, Yb3+ prepared at different temperatures

Fig. 3 Rietveld refinement of X-ray diffraction pattern for Sr2B2O5:Tb3+, Yb3+

Fig. 4 Crystal structure of Sr2B2O5:Tb3+, Yb3+

Table 1 Fractional atomic coordinates and equivalent isotropic displacement parameters (nm)

Atom	x	y	z	x'	y'	z'
Sr(1)	0.062319(9)	0.04098(1)	0.034069(5)	0.062064	0.041266	0.034105
Sr(2)	0.111767(9)	0.04502(1)	0.036749(5)	0.011638	0.04475	0.036887
O(1)	0.035710(7)	0.01510(1)	0.035170(4)	0.036784	0.013452	0.034672
O(2)	0.060710(7)	0.02120(1)	0.014040(4)	0.061327	0.022331	0.012791
O(3)	0.090130(7)	0.00920(1)	0.033130(4)	0.089034	0.007279	0.033207
O(4)	0.085370(7)	0.06980(1)	0.042790(4)	0.084245	0.074122	0.041785
O(5)	0.074630(7)	0.01010(1)	0.049270(4)	0.073834	0.006773	0.048866
B(1)	0.066000(1)	0.00680(2)	0.059500(6)	0.070546	0.003887	0.058088
B(2)	0.083900(1)	-0.0047(2)	0.041590(6)	0.089177	-0.001638	0.037818

Fig. 5 (a) Excitation spectra and (b) emission spectra of Sr2B2O5:4%Tb3+-x%Yb3+(x=0,14)

Table 2 Fluorescence properties of different strontium borate

System	Crystal structure	Excitation/nm	Emission/nm
Sr₂B₂O₅:Tb³⁺, Yb³⁺	Monoclinic	354, 374, 487	487, 543, 582, 620
Sr₂B₂O₅:Tb^3+[14]	Monoclinic	245, 300-400	488, 545, 586, 623
SrB₂O₄:Tb^3+[16]	Orthorhombic	319, 353,370, 378	490, 544, 584, 622
SrB₄O₇:Tb^3+[17]	Orthorhombic	170, 205, 225	488, 544, 585, 620

Fig. 6 (a) Excitation spectra and (b) emission spectra of sample Sr2B2O5: y%Tb3+, 10%Yb3+ recorded in visible spectral range 450-650 nm

Fig. 7 Excitation spectra recorded at 980 nm of sample Sr2B2O5:4%Tb3+, x% Yb3+(x=6,10,14,20,24)

Fig. 8 Visible emission spectra and near-infrared (NIR) emission spectra excited at 374 nm of the sample doped with different Yb3+ concentrations Inset show change of the emission intensity with Yb3+ concentrations

Fig. 9 Energy transfer mechanisms of Tb3+ and Yb3+ in Sr2B2O5

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Preparation and Down-conversion Luminescent Properties of Tb³⁺, Yb³⁺ Co-doped Sr₂B₂O₅

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