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Issue 43, 2018
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Synthesis and phase transformation of NaGdF4:Yb–Er thin films using electro-deposition method at moderate temperatures

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Abstract

NaGdF4 is considered to be one of the efficient hosts for up-conversion (UC) materials; in particular, rare earth-doped hexagonal-phase NaGdF4 exhibits strong upconversion luminescence. However, thin films of NaGdF4 are difficult to prepare by conventional methods due to the presence of fluorine, and hexagonal-phase NaGdF4 cannot be obtained easily at low temperatures. Herein, a thin film of hexagonal-phase NaGdF4:Yb–Er is fabricated by electro-deposition at moderate temperatures. More importantly, the phase of NaGdF4:Yb–Er thin film can be controlled to enhance upconversion luminescence by adding polyvinylpyrrolidone (PVP) in the electrolyte. Upon excitation using a 980 nm diode laser, the UC emission intensity of hexagonal thin films increases significantly compared with that of cubic films. The results pave a new way to control the phase of fluoride crystal films that may find potential applications in photovoltaic devices.

Graphical abstract: Synthesis and phase transformation of NaGdF4:Yb–Er thin films using electro-deposition method at moderate temperatures

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Publication details

The article was received on 09 Aug 2018, accepted on 01 Oct 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8CE01340C
Citation: CrystEngComm, 2018,20, 6919-6924
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    Synthesis and phase transformation of NaGdF4:Yb–Er thin films using electro-deposition method at moderate temperatures

    H. Jia, Y. Zhou, X. Li, Y. Li, W. Zhang, H. Fu, J. Zhao, L. Pan, X. Liu and J. Qiu, CrystEngComm, 2018, 20, 6919
    DOI: 10.1039/C8CE01340C

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