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

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

Ming-yuan GAO1,1、*, Lan LUO1,1, Rui GUO1,1, Yu WANG1,1, and Peng-peng ZHANG1,1
Author Affiliations
  • 1[in Chinese]
  • 11. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China
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    Figures & Tables(6)
    (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
    Ternary color diagram of (Mg1-x-yBaxSry)1.95SiO4∶0.05Eu under UV light excitation(a): 1 150 ℃; (b): 1 200 ℃; (c): 1 250 ℃
    • Table 1. Crystal data for phases in (Mg1-x-yBaxSry)2SiO4 powder

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      Table 1. Crystal data for phases in (Mg1-x-yBaxSry)2SiO4 powder

      PhaseSpace groupCrystal systemCoordinationSpatial location of Me2+Radius of Me2+/nm
      β-Mg2SiO4[12]PbnmOrthorhombic64e0.072 0
      γ-Mg2SiO4[12]Fd-3mCubic4, 68a(Ⅰ), 16d(Ⅱ)0.0720
      MgSr3Si2O8[13]P121/a1Monoclinic6 (Mg2+) , 8(Sr2+)4e(Mg2+), 4e(Sr2+)0.072 0, 0.126 0
      MgBa3Si2O8[14]P-3Trigonal12Ba(Ⅰ), 10Ba(Ⅱ)1b, 2d0.175 0, 0.166 0
      α-Sr2SiO4[15]PmnbOrthorhombic10(Ⅰ), 9(Ⅱ)8d0.131 0
      β-Sr2SiO4[16]P121/n1Monoclinic10(Ⅰ), 9(Ⅱ)4e0.131 0
      Ba2SiO4[17]PmcnOrthorhombic10(Ⅰ), 9(Ⅱ)4c0.152 0, 0.147 0
    • Table 2. Phase constitution of (Mg1-x-yBaxSry)2SiO4 powders with different fabricated temperatures

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      Table 2. Phase constitution of (Mg1-x-yBaxSry)2SiO4 powders with different fabricated temperatures

      CompositionPhase constitution
      1 150 ℃1 200 ℃1 250 ℃
      (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 ℃)
      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)
      (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 ℃))
      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)
      (Mg1-ySry)2SiO4
      (y=0, 0.2, 0.4, 0.6, 0.8, 1,
      yadded=(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)
      (Ba0.2SrxMg0.8-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)
      (Ba0.6SrxMg0.4-x)2SiO4
      (x=0, 0.08, 0.16,
      0.24, 0.32, 0.4)
      Ba2SiO4+β-Mg2SiO4+γ-Mg 2SiO4 (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)
      (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)
      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 3. Photographs of (Mg1-x-yBaxSry)1.95SiO4∶0.05Eu under UV light excitation

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      Table 3. Photographs of (Mg1-x-yBaxSry)1.95SiO4∶0.05Eu under UV light excitation

      Composition1 150 ℃1 200 ℃1 250 ℃
      254 nm365 nm254 nm365 nm254 nm365 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 4. Emssion center and quantum efficiency of (Mg1-x-yBaxSry)1.95SiO4∶0.05Eu phosphors

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      Table 4. Emssion center and quantum efficiency of (Mg1-x-yBaxSry)1.95SiO4∶0.05Eu phosphors

      Temperature
      /℃
      CompositionUnder 254 nm excitationUnder 365 nm excitation
      Emission
      center/nm
      Quantum
      efficiency/%
      Emission
      center/nm
      Quantum
      efficiency/%
      1 150(Mg0.25Ba0.7Sr0.05)1.95SiO4∶0.05Eu)504+363510±565
      (Mg0.7Sr0.3)1.95SiO4∶0.05Eu653±181652±283
      1 200(Mg0.3Ba0.65Sr0.05)1.95SiO4∶0.05Eu505+566511±668
      (Mg0.65Sr0.35)1.95SiO4∶0.05Eu655±184655±286
      1 250(Mg0.35Ba0.6Sr0.05)1.95SiO4∶0.05Eu507+670513±573
      (Mg0.6Sr0.4)1.95SiO4∶0.05Eu657±188656±290
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    Ming-yuan GAO, Lan LUO, Rui GUO, Yu WANG, Peng-peng ZHANG. Temperature Dependence of Phase and Color Diagram for Ternary (Mg1-x-yBaxSry)1.95SiO4: 0.05Eu Phosphors[J]. Spectroscopy and Spectral Analysis, 2021, 41(2): 460

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    Paper Information

    Category: Research Articles

    Received: Jan. 16, 2020

    Accepted: Apr. 30, 2020

    Published Online: Apr. 8, 2021

    The Author Email: Ming-yuan GAO (1206861141@qq.com)

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

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