Eu3+ Activated Y2O3 Red Phosphor Monospheres: Size-controlled Processing and Luminescence Property

doi:10.15541/jim20160207

Abstract

Abstract:

Monodispersed (Y, Eu)₂O₃ spheres (110-550 nm in diameter) were calcined from precursors synthesized via homogeneous precipitation. Systematic characterizations of the products were carried out by XRD, FE-SEM, TEM, and PLE/PL analyses. Large spherical particles were resulted via seeded growth and NH₄NO₃ addition. Calcining the basic carbonate precursor at 600℃ yielded cubic (Y, Eu)₂O₃. The spherical shape and excellent dispersion of the precursor particles were largely retained to the oxides after annealing up to 1000℃. The polycrystalline (Y, Eu)₂O₃spheres exhibited typical red emission at 615 nm (the ⁵D₀→⁷F₂ transition of Eu³⁺) under UV excitation at 242 nm. The phosphors showed a substantially size-dependent luminescent behavior. Shorter fluorescence lifetime (1.15-1.57 ms), decreased asymmetry factor (I(⁵D₀→⁷F₂)/I(⁵D₀→⁷F₁)) of luminescence, and enhanced luminescent intensity were observed along with increasing particle size.

Key words: monospheres, size-controlled processing, luminescent property, yttria

CLC Number:

TB34

QU Jiao, ZHU Qi, Li Ji-Guang, SUN Xu-Dong. Eu³⁺Activated Y₂O₃ Red Phosphor Monospheres: Size-controlled Processing and Luminescence Property[J]. Journal of Inorganic Materials, 2016, 31(10): 1087-1093.

Figures/Tables 9

Table 1 UBHP conditions for precursor synthesis

Sample ID	Ln³⁺ (Ln=Y, Eu) conentration /(mol·L^-1)	Urea concentration /(mol·L^-1)	NH₄NO₃ concentration /(mol·L^-1)	Urea/Ln³⁺ molar ration, R
S1	0.015	0.3	0	20
S2	0.015	0.5	0	33.3
S3	0.015	0.3 (adding in three times: 0.1, 0.1, 0.1)	0	20
S4	0.015	0.5 (adding in three times: 0.15, 0.15, 0.20)	0	33.3
S5	0.015	0.5	0.015	33.3
S6	0.015	0.5	0.045	33.3

Fig. 1 FE-SEM images of precursors S1-S6 (a-f)

Fig. 2 XRD patterns of the products calcined from precursor S6 at different temperatures

Fig. 3 Crystallite size of the products calcinated from precursor S6 at different temperatures

Fig. 4 FE-SEM images of the products calcinated from precursor S6 at (a) 800℃, (b) 1000℃, (c) 1300℃; (d-e) are FE-SEM and TEM micrographs of the products calcinated from precursors S1 and S4, at 1000℃ for 4 h respectively

Fig. 5 XRD patterns of the (Y0.95Eu0.05)2O3 oxides calcined from different precursors at 1000℃ for 4 h

Fig. 6 (a) PLE and (b) PL spectra of the (Y0.95Eu0.05)2O3 oxides calcined from precursor S6 at various temperatures

Fig. 7 PL spectra of the (Y0.95Eu0.05)2O3 oxides with various particle sizes

Fig. 8 Fluorescence decay curves for 615 nm emission of three typical samples calcined from different precursors at 1000℃

References 18

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Eu³⁺Activated Y₂O₃ Red Phosphor Monospheres: Size-controlled Processing and Luminescence Property

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