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Issue 40, 2018
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Narrow-band red-emitting KZnF3:Mn4+ fluoroperovskites: insights into electronic/vibronic transition and thermal quenching behavior

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Abstract

Mn4+ activated fluoride is known for its unique spectral features and low lost, meeting the urgent requirements for w-LED applications, especially in the field of wide-color-gamut backlights. Despite the ever-growing family, insightful investigations on the host-dependent electronic/vibronic transition and thermal quenching behavior of Mn4+ are insufficient. In this work, a new red-emitting KZnF3:Mn4+ fluoroperovskite is synthesized via a facile co-precipitation method. Systematical studies are performed on its microstructure, electronic structure, and spectroscopic properties. By virtue of high-resolution spectroscopy down to 10 K, both the electronic/vibronic transitions for Mn4+ and [F2] defect centers are identified, the slight distortion of the [MnF6]2− octahedron deviating from Oh symmetry is disclosed, and multiple crystallographic site occupation of Mn4+ is demonstrated. Moreover, a comparative study on the thermal quenching behavior of different fluoride hosts with nominal Oh symmetry reveals its close dependence on the 4T2g energy position in a configurational coordinate model and provides a rule of thumb to select an appropriate host with good thermal stability.

Graphical abstract: Narrow-band red-emitting KZnF3:Mn4+ fluoroperovskites: insights into electronic/vibronic transition and thermal quenching behavior

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Publication details

The article was received on 02 Sep 2018, accepted on 19 Sep 2018 and first published on 21 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC04398A
Citation: J. Mater. Chem. C, 2018,6, 10845-10854

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    Narrow-band red-emitting KZnF3:Mn4+ fluoroperovskites: insights into electronic/vibronic transition and thermal quenching behavior

    T. Hu, H. Lin, F. Lin, Y. Gao, Y. Cheng, J. Xu and Y. Wang, J. Mater. Chem. C, 2018, 6, 10845
    DOI: 10.1039/C8TC04398A

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