Coordination polymer templated engineering of YVO4:Eu submicron crystals and photoluminescence,CrystEngComm

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Coordination polymer templated engineering of YVO4:Eu submicron crystals and photoluminescence
CrystEngComm ( IF 2.6 ) Pub Date : 2020/01/07 , DOI: 10.1039/c9ce01907c
Sai Huang _{1,

2,

3,

4,

5} , Zhenshu Fan _{1,

2,

3,

4,

5} , Qi Zhu _{1,

2,

3,

4,

5} , Xiaodong Li _{1,

2,

3,

4,

5} , Xudong Sun _{1,

2,

3,

4,

5} , Ji-Guang Li _{6,

7,

8,

9}

Affiliation

Submicron-sized cuboidal and octahedral (Y_0.95Eu_0.05)VO₄ crystals were selectively synthesized via hydrothermally reacting sodium vanadate with a (Y_0.95Eu_0.05)–tartrate coordination polymer (CP) precipitated at room temperature, where the CP compound was analyzed to be an amorphous mass having particle sizes of ∼300 nm and an approximate composition of (Y_0.95Eu_0.05)₂(C₄H₄O₆)₃·7.4H₂O. A series of well controlled experiments clearly revealed that a stoichiometric amount of VO₄³⁻ [VO₄³⁻/(Y_0.95Eu_0.05)³⁺ molar ratio R = 1.0] favors cuboidal crystals (∼300–500 nm), which are formed via tartrate-directed [001] stacking of ∼15 nm thick nanosquares exposed with high energy {001} facets, whereas superfluous VO₄³⁻ (R = 1.5 and 2.0) promotes the crystallization of octahedral crystals (∼600–800 nm) enclosed by low energy {101} facets. The acting mechanisms of reaction temperature (80–200 °C) and time (1–24 h) in structure and morphology evolution were discussed in detail. The octahedrons were also analyzed to have a ∼60% stronger 619 nm red emission and a larger (⁵D₀ → ⁷F₂)/(⁵D₀ → ⁷F₁) intensity ratio, though both the types of crystals have similar fluorescence lifetimes of ∼0.9 ms for their 619 nm main emissions.

中文翻译：

YVO4：Eu亚微米晶体的配位聚合物模板化工程与光致发光

通过使钒酸钠与在室温下沉淀的（Y _0.95 Eu _0.05）-酒石酸配位聚合物（CP）水热反应，选择性地合成了亚微米长方体和八面体（Y _0.95 Eu _0.05）VO ₄晶体。被非晶形物质具有约300纳米的颗粒尺寸和的近似组合物（Y _0.95 Eu的_0.05）₂（C ₄ H ^ ₄ ö ₆）₃ ·7.4H ₂ O.一系列的很好的控制实验清楚地表明，化学计量量的VO₄^3- [VO₄^3- /（Y_0.95 Eu_0.05）³⁺摩尔比R = 1.0]有利于长方体晶体（〜300–500 nm），是通过酒石酸盐定向的[001]堆积形成的，厚度约为15 nm。纳米正方形具有高能量{001}面，而多余的VO₄³⁻（ R= 1.5和2.0）促进了低能{101}面所包围的八面体晶体（约600–800 nm）的结晶。详细讨论了反应温度（80–200°C）和时间（1–24 h）在结构和形态演变中的作用机理。八面体还被分析为具有约60％的更强的619 nm红色发射和更大的（⁵ D ₀ → ⁷ F ₂）/（⁵ D ₀ → ⁷ F ₁）强度比，尽管两种类型的晶体具有相似的荧光其619 nm主发射的寿命约为0.9 ms。

更新日期：2020-02-13

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