Syntheses and Photoluminescence Properties of Sr2Si5N8:Eu2+ Phosphors

doi:10.15541/jim20140057

Abstract

Abstract:

Sr₂Si₅N₈:Eu²⁺ phosphors were prepared by carbothermal reduction and nitridation method using Sr₂CO₃, Si₃N₄ and Eu₂O₃ as raw materials, and C as main reduction agent. The influence of C, Sr₂CO₃and Eu²⁺ contents on phase composition and photoluminescence properties of as-prepared phosphors were investigated. The experimental results indicate that single-phase Sr₂Si₅N₈:Eu²⁺is produced with molar ratio n_c/n_Si3N4=9/5. Excessive Sr₂CO₃ addition contributes to the N contents of the as-prepared phosphors, which enhances emission intensity. There is an asymmetric wide emission peaks between 550 nm and 700 nm due to the electron transfer of Eu²⁺ from 4f⁶5d¹to 4f⁷ excited by 450 nm. Increasing Eu²⁺ concentration from 1.5mol% to 20mol%, the luminescence intensity hits the maximum value at Eu²⁺ concentration of 2mol% followed by continuous decline. Meanwhile the emission peak position is red-shifted from 608 nm to 641 nm, and the CIE chromaticity coordinates varies from (0.606, 0.393) to (0.656, 0.343), which indicates that Sr₂Si₅N₈:Eu²⁺ is a promising phosphor for white LEDs.

Key words: alkaline-earth-silicon-nitrides, phosphor, carbothermal reduction and nitridation method, luminescence

CLC Number:

Q614

PENG Xia,LI Shu-Xing, LIU Xue-Jian, HUANG Zheng-Ren, LI Hui-Li. Syntheses and Photoluminescence Properties of Sr₂Si₅N₈:Eu²⁺Phosphors[J]. Journal of Inorganic Materials, 2014, 29(12): 1281-1286.

Figures/Tables 11

Fig. 1 XRD patterns of samples with different molar ratios of nc/

Fig. 2 Excitation and emission spectra of samples with different molar ratios of nc/(λem=609 nm, λex=450 nm)

Fig. 3 XRD patterns of samples produced with different excessive Sr2CO3 additions as a function of temperature

Table 1 Elements analyses of samples produced with different excessive Sr2CO3 additions

Sr₂CO₃ excessive/ mol%	0	5	10	15	20
O/wt%	0.58	0.89	1.13	1.80	2.08
N/wt%	22.88	23.06	23.30	21.28	19.58

Fig. 4 Emission spectra of samples produced with different excessive Sr2CO3 additions (λex=450 nm)

Fig. 5 XRD patterns of samples doped with different concentrations of Eu2+

Fig. 6 Emission spectra of samples doped with different concentrations of Eu2+

Fig. 7 Gaussian deconvoluted emission curves of Sr2Si5N8: 2mol%Eu2+

Fig. 8 CIE chromaticity coordinates of samples doped with different concentrations of Eu2+

Fig. 9 XRD patterns of samples synthesized by CTRN and SSR method

Fig. 10 Emission spectra of samples synthesized by CTRN and SSR methods

References 26

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Syntheses and Photoluminescence Properties of Sr₂Si₅N₈:Eu²⁺Phosphors

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