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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

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Abstract

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.

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

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Publication details

The article was received on 06 Sep 2017, accepted on 30 Oct 2017 and first published on 01 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04079B
Citation: J. Mater. Chem. C, 2017, Advance Article
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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

    H. Jia, Z. Chen, Z. Liu, J. Zhao, C. Ding, H. Yang, W. Zhang, X. Liu and J. Qiu, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC04079B

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