Issue 17, 2023

Surface lattice enhancement of red-emitting fluorides enabled by embedding small cations

Abstract

The poor moisture resistance of Mn4+-activated fluoride red phosphors restricts their practical applications. Herein, this work proposes the embedment of small radius cations (Si4+ or Ge4+) into the inert shell (K2TiF6) constructed on the surface of K2TiF6:Mn4+ particles, which increases the covalence of the surface lattice and thus leads to a significant improvement of the stability of the fluoride. By using multidimensional microstructural characterization techniques, we confirmed the construction of a heterogeneous shell (K2Ti1−xSixF6 and K2Ti1−yGeyF6) and systematically investigated the construction process. Compared to the untreated K2TiF6:Mn4+, the external quantum efficiencies of the K2TiF6:Mn4+@K2Ti1−xSixF6 and K2TiF6:Mn4+@K2Ti1−yGeyF6 heterogeneous core–shell particles improved by 2–3%, and 99% and 88% of the initial luminescence intensity were maintained after boiling in water for 50 min, respectively, which are significantly better than that (25%) of the homogeneous K2TiF6:Mn4+@K2TiF6. The aging of red and white light-emitting diode devices at a high temperature (85 °C) and a high humidity (85%) shows that the heterogeneous core–shell structures have higher stability than their homogeneous counterparts. The surface lattice enhancement strategy proposed in this work is useful as a reference for improving the properties of other under-stable materials.

Graphical abstract: Surface lattice enhancement of red-emitting fluorides enabled by embedding small cations

Supplementary files

Article information

Article type
Research Article
Submitted
10 Jun 2023
Accepted
12 Jul 2023
First published
13 Jul 2023

Inorg. Chem. Front., 2023,10, 5089-5097

Surface lattice enhancement of red-emitting fluorides enabled by embedding small cations

P. Wan, C. Yang, A. Wang, L. Yu, S. Lian and W. Zhou, Inorg. Chem. Front., 2023, 10, 5089 DOI: 10.1039/D3QI01088K

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