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Design, synthesis, crystal structure and luminescent properties of a new tantalum-phosphate K3BiTaP3O13 with negligible concentration quenching and good thermostability

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Abstract

The luminous efficiency of rare-earth (Ln3+)-doped luminescent materials suffers greatly from the negative concentration quenching effect, which can be surmounted by a large separation of Ln3+ ions in the host lattice. Herein, this study reports a novel tantalum-phosphate K3BiTaP3O13 (KBTP) that possesses a ‘chain-like’ structure when viewed along the c-axis, containing [TaO(PO4)2], K and [Bi(PO4)] chains. UV-Vis spectroscopy and density functional theory (DFT) calculations reveal that K3BiTaP3O13 has an indirect band-gap of 3.99 eV, making it suitable as a luminescent host matrix. A series of Eu3+ or Tb3+ phosphors KBTP:xEu/Tb (x = 0.1–1) were prepared and their fluorescent performance was studied. Due to the Bi3+ ions being far apart in the KBTP host, the negative concentration quenching effect of the prepared phosphors was greatly limited, even when the concentration of Eu/Tb reached up to 80% replacing Bi3+. Moreover, both phosphors had good heat-resistance properties at 30–200 °C, keeping 85.6% (KBTP:0.8Eu) and 71.3% (KBTP:0.8Tb) of the initial intensity at 200 °C. These results preliminarily suggest that KBTP is promising as a host material for both Eu3+ and Tb3+ fluorescence.

Graphical abstract: Design, synthesis, crystal structure and luminescent properties of a new tantalum-phosphate K3BiTaP3O13 with negligible concentration quenching and good thermostability

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Publication details

The article was received on 03 Oct 2019, accepted on 23 Nov 2019 and first published on 25 Nov 2019


Article type: Research Article
DOI: 10.1039/C9QI01279F
Inorg. Chem. Front., 2020, Advance Article

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    Design, synthesis, crystal structure and luminescent properties of a new tantalum-phosphate K3BiTaP3O13 with negligible concentration quenching and good thermostability

    D. Zhao, Y. Xue, R. Zhang, B. Liu, Y. Fan, S. Dai, S. Zhang and Z. Ma, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QI01279F

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