Synthesis and Property of Spherical Lu3Al5O12:Eu3+ Phosphor

doi:10.15541/jim20150479

Abstract

Abstract:

Spherical phosphors of (Lu_0.95Eu_0.05)₃Al₅O₁₂((Lu_0.95Eu_0.05)AG) with good dispersion was achieved through precursor synthesis via homogeneous precipitation method using urea as the precipitant, followed by annealing. The size of spherical particle can be effectively controlled by adjusting the urea concentration. Based on it, the synthesis, phase evolution and photoluminescent properties of the (Lu_0.95Eu_0.05)AG phosphors were tested by XRD, FE-SEM, TEM, BET, PLE/PL, and fluorescence decay analyses. The results showed that the precursors were converted into phase-pure (Lu_0.95Eu_0.05)AG garnet at a relatively low temperature of 1100℃. The (Lu_0.95Eu_0.05)AG garnets possessed high theoretical densities which were suitable for the application of scintillation material. The phosphors exhibited strong orange red emissions at 592 nm (the ⁵D₀→⁷F₁ magnetic dipole transitions of Eu³⁺) upon UV excitation into the charge transfer band (CTB) at 235 nm, with CIE chromaticity coordinates of (0.63, 0.37). The intensity of 592 nm emission increased with the particle size increase, while the lifetime of 592 nm emission decreases at a higher particle size. Thus, the spherical phosphors of (Lu_0.95Eu_0.05)AG garnet developed in the present work were expected to be a new type of phosphor which may be widely used in lighting and displaying areas.

Key words: Lu3Al5O12 garnet, Eu3+ doping, spherical particle, luminescent property

CLC Number:

TQ133

LI Jin-Kai, TENG Xin, CAO Bing-Qiang, LIU Zong-Ming. Synthesis and Property of Spherical Lu₃Al₅O₁₂:Eu³⁺ Phosphor[J]. Journal of Inorganic Materials, 2016, 31(6): 634-640.

Figures/Tables 10

Table 1 The condition of urea-based homogeneous precipitation (UBHP) for precursor synthesis

Sample	Ln³⁺(Ln=Lu+Eu)/ (mol·L^-1)	Al(NO₃)₃/ (mol·L^-1)	NH₄Al(SO₄)₂/ (mol·L^-1)	CO(NH₂)₂/ (mol·L^-1)	Molar ratio R= CO(NH₂)₂/(Ln³⁺+Al³⁺)
S1	0.0012	0.00200	0	0.128	40
S2	0.0012	0.00134	0.00066	0.128	40
S3	0.0012	0.00100	0.00100	0.128	40
S4	0.0012	0.00066	0.00134	0.128	40
S5	0.0012	0	0.00200	0.128	40
S6	0.0012	0.00100	0.00100	0.064	20
S7	0.0012	0.00100	0.00100	0.192	60
S8	0.0012	0.00100	0.00100	0.320	100

Fig. 1 FT-IR spectra of typical precursors S1-S5

Fig. 2 FE-SEM images of precursors S1-S5 (a-e)

Fig. 3 TG/DTA curves of precursor S3

Fig. 4 XRD patterns of (Lu0.95Eu0.05)AG precursor S3 calcined at different temperatures. Letters G, P and M represent LnAG garnet, LnAP perovskite and LnAM monoclinic (Ln=Lu and Eu), respectively

Fig. 5 FE-SEM images (a-e) of the (Lu0.95Eu0.05)AG powders obtained from calcining their respective precursors S1-S5 at 1100℃

Fig. 6 FE-SEM (a-c) and HR-TEM (d) images of (Lu0.95 Eu0.05)AG obtained by calcining their precursors S6-S8, S3 at 1100℃with different urea concentrations. (a) S6, R=20; (b) S7, R=60; (c) S8, R=100; (d) S3, R=40

Fig. 7 Photoluminescence excitation (PLE) spectra monitoring at 592 nm emission of the (Lu0.95Eu0.05)AG phosphors calcined at 1100℃ for 4 h with different urea concentrations (R)

Fig. 8 Photoluminescence (PL) spectra of the (Lu0.95 Eu0.05)AG phosphors calcined at 1100℃ under different R values. The PL spectra were obtained by monitoring at 235 nm wavelength excitation. The inset shows relative intensity of the 592 nm Eu3+ emission as a function of R value

Fig. 9 Fluorescence decay curves for 592 nm emission of (Lu0.95Eu0.05)AG powders calcined at 1100℃ for 4 h with different R values

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Synthesis and Property of Spherical Lu₃Al₅O₁₂:Eu³⁺ Phosphor

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