Microwave Assisted Sintering and Photoluminescence Properties of Ba3Si6O12N2:Eu2+ Green Phosphors

doi:10.15541/jim20140495

Abstract

Abstract:

Eu²⁺-doped Ba₃Si₆O₁₂N₂ green phosphors were prepared by microwave assisted sintering method at 1275℃ for 4 h, while the counterparts using conventional solid-state reaction method were synthesized at temperature higher than 1300℃ and for to 10 h. Microwave assisted sintering could reduce the activation energy and enhance the diffusion rate, thus greatly improved the sintering. Moreover, the influence of Si₃N₄ content on phase formation, morphology, absorption, and quantum efficiency, and photoluminescence properties of phosphors were studied. As a result, the Ba₃Si₆O₁₂N₂:Eu²⁺ samples sintered by microwave assisted sintering method have a higher phase purity and photoluminescence intensity under ultraviolet excitation as compared with samples sintered in the conventional tube furnace. The proposed method is a potential preparation method for the oxynitride phosphors with strong photoluminescence and high phase purity.

Key words: Ba3Si6O12N2:Eu2+ phosphors, oxynitride, microwave assisted sintering, photoluminescence

CLC Number:

TQ174

HAN Bin, WANG Yi-Fei, LIU Qian, HUANG Qing. Microwave Assisted Sintering and Photoluminescence Properties of Ba₃Si₆O₁₂N₂:Eu²⁺ Green Phosphors[J]. Journal of Inorganic Materials, 2015, 30(3): 330-336.

Figures/Tables 8

Fig. 1 XRD patterns of Ba2.8Si6O12N2: 0.2Eu2+ phosphors synthesized by SSR and MWS methods

Fig. 2 Excitation and emission spectra of Ba2.8Si6O12N2: 0.2Eu2+ phosphor prepared by SSR and MWS methods

Fig. 3 Micro-morphologies of the samples prepared by (a) SSR and (b) MWS methods, and size distribution of the particles prepared by (c) SSR and (d) MWS methods

Fig. 4 Absorption, internal and external quantum efficiencies of the samples prepared by MWS and SSR methods

Fig. 5 XRD patterns of Ba2.8Si6O12N2: 0.2Eu2+ phosphors as a function of Si3N4 content (a) 0.6Si3N4, (b) 0.7Si3N4, (c) 0.8Si3N4, (d) 0.9Si3N4 and (e) 1.0Si3N4, by MWS method at 1275℃ for 4 h. The inset indicates XRD of the sample with 0.8Si3N4 for different soaking time (2, 4, and 6 h, respectively)

Fig. 6 Excitation and emission spectra of Ba2.8Si6O12N2: 0.2Eu2+ phosphors as a function of Si3N4 contents, by MWS method at 1275℃ for 4 h. The inset indicating PL intensity of the sample with 0.8Si3N4 for different soaking time (2, 4, and 6 h, respectively)

Fig. 7 Morphologies of samples with different Si3N4 contents (a) 0.6Si3N4, (b) 0.7Si3N4, (c) 0.8Si3N4, (d) 0.9Si3N4, (e) 1.0Si3N4 by MWS method at 1275℃ for 4 h, (f) a SEM image of the post-treated sample with 0.8Si3N4 by smashing and acid washing

Fig. 8 (a) Particle size distribution of the post-treated sample with 0.8Si3N4, (b) absorption and quantum efficiency of the post-treated sample and (c) PL intensity of as-prepared and post-treated sample

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Microwave Assisted Sintering and Photoluminescence Properties of Ba₃Si₆O₁₂N₂:Eu²⁺ Green Phosphors

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