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Issue 16, 2018
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Stable narrowband red emission in fluorotellurate KTeF5:Mn4+via Mn4+ noncentral-site occupation

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Abstract

Unlike conventional central-site doping, herein, abnormally equivalent Mn4+ accommodation in a five-fold coordinated distorted octahedron in the vertical occupation site is reported in fluorotellurate KTeF5:Mn4+. This very unique substitution results in thermally stable (remaining emission of 86.7% at 423 K) and highly purified red emission in KTeF5:Mn4+. Refined contrasts of the coordination environment, crystal field, nephelauxetic effect, temperature-dependent static and dynamic luminescence behavior, and defect mechanism between fluorides with different Mn4+ accommodation models (K2SiF6:Mn4+, K2NaAlF6:Mn4+, KTeF5:Mn4+, K3ZrF7:Mn4+, K2TaF7:Mn4+ and Na3TaF8:Mn4+) are conducted to investigate the local environment dependence of the Mn4+ emission properties. It is found that the emission of KTeF5:Mn4+ might be stabilized by equivalent octahedral Mn4+ accommodation with interstitial defects. These findings reveal the possible effects of special accommodation models on the Mn4+ emission properties, which further enlighten us to explore stable fluoride red phosphors with suitable Mn4+ accommodation for white light-emitting diode applications.

Graphical abstract: Stable narrowband red emission in fluorotellurate KTeF5:Mn4+via Mn4+ noncentral-site occupation

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Publication details

The article was received on 08 Feb 2018, accepted on 17 Mar 2018 and first published on 21 Mar 2018


Article type: Paper
DOI: 10.1039/C8TC00689J
Citation: J. Mater. Chem. C, 2018,6, 4418-4426
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    Stable narrowband red emission in fluorotellurate KTeF5:Mn4+via Mn4+ noncentral-site occupation

    T. T. Deng, E. H. Song, J. Su, Y. Y. Zhou, L. Y. Wang, S. Ye and Q. Y. Zhang, J. Mater. Chem. C, 2018, 6, 4418
    DOI: 10.1039/C8TC00689J

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