Temperature Dependence of Phase and Color Diagram for Ternary (Mg1-x-yBaxSry)1.95SiO4: 0.05Eu Phosphors

Ming-yuan GAO; Lan LUO; Rui GUO; Yu WANG; Peng-peng ZHANG

doi:10.3964/j.issn.1000-0593(2021)02-0460-07

Journals >Spectroscopy and Spectral Analysis >Volume 41 >Issue 2 >Page 460 > Article

Spectroscopy and Spectral Analysis
Vol. 41, Issue 2, 460 (2021)

Temperature Dependence of Phase and Color Diagram for Ternary (Mg_1-_x-yBa_xSr_y)_1.95SiO₄: 0.05Eu Phosphors

Ming-yuan GAO^1、1、*, Lan LUO^1、1, Rui GUO^1、1, Yu WANG^1、1, and Peng-peng ZHANG^1、1

Author Affiliations

¹[in Chinese]

¹1. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China

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DOI: 10.3964/j.issn.1000-0593(2021)02-0460-07 Cite this Article

Ming-yuan GAO, Lan LUO, Rui GUO, Yu WANG, Peng-peng ZHANG. Temperature Dependence of Phase and Color Diagram for Ternary (Mg_1-_x-yBa_xSr_y)_1.95SiO₄: 0.05Eu Phosphors[J]. Spectroscopy and Spectral Analysis, 2021, 41(2): 460 Copy Citation Text

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(Mg1-x-yBaxSry)2SiO4 (a) composition design and phase diagram for (b) 1 150 ℃, (c) 1 200 ℃, (d) 1 250 ℃The phase constitutions for the composition point is marked with different geometric figur, as circle for single-phase, semicircle for binary-phase, triangle for ternary-phase, square for quaternary-phase, pentagon for five-phase, the same shape but with different color stands for same in phase numbers but different in phase constitutions

Fig. 1. (Mg_1-_x_-_yBa_xSr_y)₂SiO₄ (a) composition design and phase diagram for (b) 1 150 ℃, (c) 1 200 ℃, (d) 1 250 ℃
The phase constitutions for the composition point is marked with different geometric figur, as circle for single-phase, semicircle for binary-phase, triangle for ternary-phase, square for quaternary-phase, pentagon for five-phase, the same shape but with different color stands for same in phase numbers but different in phase constitutions

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Ternary color diagram of (Mg1-x-yBaxSry)1.95SiO4∶0.05Eu under UV light excitation(a): 1 150 ℃; (b): 1 200 ℃; (c): 1 250 ℃

Fig. 2. Ternary color diagram of (Mg_1-_x_-_yBa_xSr_y)_1.95SiO₄∶0.05Eu under UV light excitation
(a): 1 150 ℃; (b): 1 200 ℃; (c): 1 250 ℃

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Phase	Space group	Crystal system	Coordination	Spatial location of Me²⁺	Radius of Me²⁺/nm
β-Mg₂Si ${O_{4}}^{[12]}$	Pbnm	Orthorhombic	6	4e	0.072 0
γ-Mg₂Si ${O_{4}}^{[12]}$	Fd-3m	Cubic	4, 6	8a(Ⅰ), 16d(Ⅱ)	0.0720
MgSr₃Si₂ ${O_{8}}^{[13]}$	P121/a1	Monoclinic	6 (Mg²⁺) , 8(Sr²⁺)	4e(Mg²⁺), 4e(Sr²⁺)	0.072 0, 0.126 0
MgBa₃Si₂ ${O_{8}}^{[14]}$	P-3	Trigonal	12Ba(Ⅰ), 10Ba(Ⅱ)	1b, 2d	0.175 0, 0.166 0
α-Sr₂Si ${O_{4}}^{[15]}$	Pmnb	Orthorhombic	10(Ⅰ), 9(Ⅱ)	8d	0.131 0
β-Sr₂Si ${O_{4}}^{[16]}$	P121/n1	Monoclinic	10(Ⅰ), 9(Ⅱ)	4e	0.131 0
Ba₂Si ${O_{4}}^{[17]}$	Pmcn	Orthorhombic	10(Ⅰ), 9(Ⅱ)	4c	0.152 0, 0.147 0

Table 1. Crystal data for phases in (Mg_1-_x_-_yBa_xSr_y)₂SiO₄ powder

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Composition	Phase constitution
Composition	1 150 ℃	1 200 ℃	1 250 ℃
(Mg_1-_xBa_x)₂SiO₄ (x=0, 0.1 , 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 , 0.8, 0.9, 1, x_added=(0.65)_{1 200 ℃, 1 250 ℃})	β-Mg₂SiO₄+γ-Mg₂SiO₄(x=0) →Ba₂SiO₄+β-Mg₂SiO₄+γ-Mg₂SiO₄(0<x<0.8)→Ba₂SiO₄(x≥0.8)	β-Mg₂SiO₄+γ-Mg₂SiO₄(x=0)→Ba₂SiO₄+β-Mg₂SiO₄+γ-Mg₂SiO₄(0<x<0.7)→Ba₂SiO₄(x≥0.7)	β-Mg₂SiO₄+γ-Mg₂SiO₄(x=0)→Ba₂SiO₄+β-Mg₂SiO₄+γ-Mg₂SiO₄(0<x<0.65)→Ba₂SiO₄ (x≥0.65)
(Ba_1-_ySr_y)₂SiO₄ (y=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, y_added=(0.35)_{1 200 ℃}))	Ba₂SiO₄(y≤0.3)→Ba₂SiO₄+α-Sr₂SiO₄(0.3<y≤0.6)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄ (0.6<y≤0.9) →α-Sr₂SiO₄+β-Sr₂SiO₄ (y>0.9)	Ba₂SiO₄(y≤0.35)→Ba₂SiO₄+α-Sr₂SiO₄(0.35<y≤0.6)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄ (0.6<y≤1.0)→α-Sr₂SiO₄+β-Sr₂SiO₄ (y>0.9)	Ba₂SiO₄(y≤0.4)→Ba₂SiO₄+α-Sr₂SiO₄(0.4<y≤0.6)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄(0.6<y≤0.9)→α-Sr₂SiO₄+β-Sr₂SiO₄(y>0.9)
(Mg_1-_ySr_y)₂SiO₄ (y=0, 0.2, 0.4, 0.6, 0.8, 1, y_added=(0.1)_{1 250 ℃})	γ-Mg₂SiO₄+β-Mg₂SiO₄(y=0)→α-Sr₂SiO₄+β-Sr₂SiO₄+γ-Mg₂SiO₄+β-Mg₂SiO₄(0<y≤0.2)→α-Sr₂SiO₄+β-Sr₂SiO₄+γ- Mg₂SiO₄+β-Mg₂SiO₄+Sr₃MgSi₂O₈(0.2<y≤0.6)→α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄+Sr₃MgSi₂O₈(0.6<y≤0.8)→α-Sr₂SiO₄+β-Sr₂SiO₄(0.8<y≤1.0)	γ-Mg₂SiO₄+β-Mg₂SiO₄(y=0) →α-Sr₂SiO₄+β-Sr₂SiO₄+γ-Mg₂SiO₄+β-Mg₂SiO₄(0<y≤0.2)→α-Sr₂SiO₄+β-Sr₂SiO₄+γ-Mg₂SiO₄+β-Mg₂SiO₄+Sr₃MgSi₂O₈(0.2<y≤0.6)→α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄+Sr₃MgSi₂O₈(0.6<y≤0.8)→α-Sr₂SiO₄+β-Sr₂SiO₄(0.8<y≤1.0)	γ-Mg₂SiO₄+β-Mg₂SiO₄(y≤0.1)→β-Mg₂SiO₄(0.1<y≤0.2)→ α-Sr₂SiO₄+β-Sr₂SiO₄+γ-Mg₂SiO₄+β-Mg₂SiO₄(0.2<y≤0.4)→α-Sr₂SiO₄+β-Sr₂SiO₄+γ-Mg₂SiO₄+β-Mg₂SiO₄+Sr₃MgSi₂O₈(0.4<y≤0.6)→α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄+Sr₃MgSi₂O₈(0.6<y≤0.8)→α-Sr₂SiO₄+β-Sr₂SiO₄(0.8<y≤1.0)
(Ba_0.2Sr_xMg_0.8-_x)₂SiO₄ (x=0, 0.16, 0.32, 0.48, 0.64, 0.8)	Ba₂SiO₄+β-Mg₂SiO₄+γ-Mg₂SiO₄(x=0) →Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄(0<x≤0.16)→Ba₃SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄+Sr₃MgSi₂O₈ (0.16<x≤ 0.48)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄+Mg₂SiO₄(0.48<x≤0.64)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄(x>0.64)	Ba₂SiO₄+β-Mg₂SiO₄+γ-Mg₂SiO₄(x=0)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄(0<x≤0.16)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄+Sr₃MgSi₂O₈(0.16<x≤0.48)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄+Mg₂SiO₄(0.48<x≤0.64)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄(x>0.64)	γ-Mg₂SiO₄+Ba₂Si₃O₈(x=0)→α-Sr₂SiO₄+β-Sr₂SiO₄+γ-Mg₂SiO₄(0<x≤0.16)→α-Sr₂SiO₄+β-Sr₂SiO₄+Sr₃MgSi₂O₈(0.16<x≤0.48)→α-Sr₂SiO₄+β-Sr₂SiO₄+γ-Mg₂SiO₄(0.48<x≤0.64)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄(x>0.64)
(Ba_0.6Sr_xMg_0.4-_x)₂SiO₄ (x=0, 0.08, 0.16, 0.24, 0.32, 0.4)	Ba₂SiO₄+β-Mg₂SiO₄+γ-Mg₂SiO₄ (x=0) →Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄(0<x≤0.16)→Ba₂SiO₄+α-Sr₂SiO₄+SrMgSi₂O₈+Sr₂MgSi₂O₈(0.16<x≤0.24)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄ (0.24<x≤0.32) →Ba₂SiO₄+α-Sr₂SiO₄(x>0.32)	Ba₂SiO₄+β-Mg₂SiO₄+γ-Mg₂SiO₄ (x=0)→Ba₂SiO₄+Sr₃MgSi₂O₈+α-Sr₂SiO₄(0<x≤0.16)→Ba₂SiO₄+α-Sr₂SiO₄+SrMgSi₂O₈+Sr₂MgSi₂O₈(0.16<x≤0.24)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄(0.24<x≤0.32)→Ba₂SiO₄+α-Sr₂SiO₄(x>0.32)	Ba₂SiO₄+β-Mg₂SiO₄+γ-Mg₂SiO₄(x=0)→Ba₂SiO₄+Sr₃MgSi₂O₈+α-Sr₂SiO₄(0<x≤0.24)→Ba₂SiO₄+α-Sr₂SiO₄(0.24<x≤0.32)→Ba₂SiO₄(x>0.32)
(Ba_x(Mg_0.2Sr_0.8)_1-_x)₂SiO₄ (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1)	α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄+MgSr₃Si₂O₈(x=0)→Ba₂SiO₄+Sr₃MgSi₂O₈+α-Sr₂SiO₄+β-Mg₂SiO₄(0<x<0.3)→Ba₂SiO₄+α-Sr₂SiO₄+MgSr₃Si₂O₈(0.3≤x<0.7) →Ba₂SiO₄(x≥0.7)	α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄+MgSr₃Si₂O₈(x=0)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄(0<x<0.3)→Ba₂SiO₄+α-Sr₂SiO₄+MgSr₃Si₂O₈(0.3≤x<0.65)→Ba₂SiO₄(x≥0.65)	α-Sr₂SiO₄+β-Sr₂SiO₄+β-Mg₂SiO₄+MgSr₃Si₂O₈(x=0)→Ba₂SiO₄+α-Sr₂SiO₄+β-Sr₂SiO₄+Mg₂SiO₄(0<x≤0.2)→Ba₂SiO₄+α-Sr₂SiO₄+MgSr₃Si₂O₈(0.3≤x<0.5)→Ba₂SiO₄+α-Sr₂SiO₄(0.5≤x≤0.6) →Ba₂SiO₄(x>0.6)

Table 2. Phase constitution of (Mg_1-_x_-_yBa_xSr_y)₂SiO₄ powders with different fabricated temperatures

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Composition	1 150 ℃		1 200 ℃		1 250 ℃
Composition	254 nm	365 nm	254 nm	365 nm	254 nm	365 nm
(Mg1-xBax)2SiO4(x=0, 0.1 , 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, xadded =(0.65)1 200 ℃, 1 250 ℃)
(Ba1-ySry)2SiO4(y=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, yadded=(0.35)1 200 ℃))
(Mg1-ySry)2SiO4(y=0, 0.2, 0.4, 0.6, 0.8, 1, yadded=(0.1)1 250 ℃)
(Ba0.2SrxMg0.8-x)2SiO4(x=0, 0.16, 0.32, 0.48, 0.64, 0.8)
(Ba0.6SrxMg0.4-x)2SiO4(x=0, 0.08, 0.16, 0.24, 0.32, 0.4)
(Bax(Mg0.2Sr0.8)1-x)2SiO4(x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1)

Table 3. Photographs of (Mg_1-_x_-_yBa_xSr_y)_1.95SiO₄∶0.05Eu under UV light excitation

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Temperature /℃	Composition	Under 254 nm excitation		Under 365 nm excitation
Temperature /℃	Composition	Emission center/nm	Quantum efficiency/%	Emission center/nm	Quantum efficiency/%
1 150	(Mg_0.25Ba_0.7Sr_0.05)_1.95SiO₄∶0.05Eu)	504+3	63	510±5	65
1 150	(Mg_0.7Sr_0.3)_1.95SiO₄∶0.05Eu	653±1	81	652±2	83
1 200	(Mg_0.3Ba_0.65Sr_0.05)_1.95SiO₄∶0.05Eu	505+5	66	511±6	68
1 200	(Mg_0.65Sr_0.35)_1.95SiO₄∶0.05Eu	655±1	84	655±2	86
1 250	(Mg_0.35Ba_0.6Sr_0.05)_1.95SiO₄∶0.05Eu	507+6	70	513±5	73
1 250	(Mg_0.6Sr_0.4)_1.95SiO₄∶0.05Eu	657±1	88	656±2	90

Table 4. Emssion center and quantum efficiency of (Mg_1-_x_-_yBa_xSr_y)_1.95SiO₄∶0.05Eu phosphors

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