CaF2:Eu films shine novel blue, white or red luminescence though adjustment of the valence state of Eu ions using the electro-deposition method,Journal of Materials Chemistry C

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CaF2:Eu films shine novel blue, white or red luminescence though adjustment of the valence state of Eu ions using the electro-deposition method
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-11-01 00:00:00 , DOI: 10.1039/c7tc04079b
Hong Jia _{1,

2,

3,

4,

5} , Zhi Chen _{4,

6,

7,

8} , Zhongli Liu _{1,

2,

3,

4} , Jianguo Zhao _{1,

2,

3,

4} , Chaoliang Ding _{1,

2,

3,

4} , Haifeng Yang _{1,

2,

3,

4} , Weiying Zhang _{1,

2,

3,

4} , Xiaofeng Liu _{4,

5,

9,

10} , Jianrong Qiu _{4,

5,

6,

9,

10}

Affiliation

We report the fabrication of Eu-doped CaF₂ films with an adjustable oxidation state of Eu ions such as Eu²⁺, Eu²⁺/Eu³⁺ or Eu³⁺ by the electro-deposition method, which are promising for luminescence converters for LEDs. Usually, the Eu²⁺ ion is unstable and can be very easily oxidized into the Eu³⁺ ion in solution. We reduced Eu³⁺ ions into Eu²⁺ ions by the electrochemical reduction method, and then incorporated Eu²⁺ ions into a CaF₂ film during successive electro-deposition. We controlled the balance between Eu²⁺, Eu²⁺/Eu³⁺ and Eu³⁺ doped in the CaF₂ thin film by regulating the parameters of the deposition solution (pH). More importantly, we controlled the luminescence from the Eu doped CaF₂ film to generate pure blue luminescence, white luminescence, and red luminescence. These results not only provide a method for reducing Eu³⁺ ions into Eu²⁺ ions in solution, but also establish a new preparation technique for Eu²⁺/Eu³⁺ ion doped films and pave a new way for potential applications of Eu²⁺ doped luminescent materials.

中文翻译：

CaF ₂：Eu膜通过电沉积方法调节Eu离子的价态，从而发出新颖的蓝色，白色或红色发光

我们报道了通过电沉积法制备具有可调节的Eu离子如Eu 2 ⁺，Eu ²⁺ / Eu ³⁺或Eu ³⁺的Eu离子的氧化态的Eu掺杂CaF ₂膜的制造，这对于发光转换器的应用是有希望的。发光二极管。通常，Eu ²⁺离子不稳定，在溶液中很容易被氧化成Eu ³⁺离子。我们通过电化学还原方法将Eu ³⁺离子还原为Eu ²⁺离子，然后在连续的电沉积过程中将Eu ²⁺离子掺入CaF ₂膜中。我们控制了Eu ²⁺和Eu之间的平衡通过调节沉积溶液的参数（pH），在CaF₂薄膜中掺杂²⁺ / Eu³⁺和Eu³⁺。更重要的是，我们控制了Eu掺杂CaF₂膜的发光，以产生纯蓝色发光，白色发光和红色发光。这些结果不仅为将Eu³⁺离子还原为溶液中的Eu²⁺离子提供了一种方法，而且为掺入Eu²⁺ / Eu³⁺离子薄膜的制备提供了新的技术，为Eu^2的潜在应用铺平了道路。⁺掺杂的发光材料。

更新日期：2017-11-16

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