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Issue 35, 2014
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Synthesis, structure and luminescence properties of new chloro-germanate phosphors Ca3GeO4Cl2:Eu2+

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Abstract

A kind of novel blue-emitting chloro-germanate phosphor Ca3GeO4Cl2:Eu2+ has been synthesized via a high temperature solid-state method. The crystal structure of the as-prepared phosphor was discussed from the viewpoint of the doping behaviors of the activators. The luminescence properties and thermal stability of Ca3GeO4Cl2:Eu2+ was investigated in detail. Ca3GeO4Cl2:Eu2+ phosphors exhibit a broad-band excitation band in the near ultra-violet region and a blue emission peak at 428 nm, which are both ascribed to the 4f–5d transitions of the Eu2+ ions. The optimum concentration of Eu2+ in the Ca3GeO4Cl2 phosphor was determined to be 3 mol%, and the concentration quenching mechanism was considered to be the dipole–dipole interaction with a critical distance of Rc = 22.11 Å. Thermal stability studies show that the photoluminescence intensity of the Ca3GeO4Cl2:Eu2+ phosphor at 150 °C was 77% of the initial value at room temperature. The activation energy, E, was calculated to be 0.163 eV suggesting good thermal stability. The variation in lifetime of Ca3GeO4Cl2:Eu2+ phosphor was also discussed to verify different luminescence centers in the lattice.

Graphical abstract: Synthesis, structure and luminescence properties of new chloro-germanate phosphors Ca3GeO4Cl2:Eu2+

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Publication details

The article was received on 02 May 2014, accepted on 09 Jul 2014 and first published on 09 Jul 2014


Article type: Paper
DOI: 10.1039/C4DT01306A
Citation: Dalton Trans., 2014,43, 13370-13376
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    Synthesis, structure and luminescence properties of new chloro-germanate phosphors Ca3GeO4Cl2:Eu2+

    X. Chen, Z. Xia and Q. Liu, Dalton Trans., 2014, 43, 13370
    DOI: 10.1039/C4DT01306A

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