Enhancing Structural Rigidity via a Strategy Involving Protons for Creating Water-Resistant Mn 4+ -Doped Fluoride Phosphors

作者：Tianchun Lang, Jinyu Wang, Tao Han, Mingsheng Cai, Shuangqiang Fang, Yang Zhong, Lingling Peng, Shixiu Cao, Bitao Liu, Е. Ф. Полисадова, V. I. Korepanov, Аlexey N. Yakovlev · 发表于：Inorganic Chemistry · 年份：2021 · DOI：10.1021/acs.inorgchem.0c03284 · 被引用次数：35 · 研究领域：Luminescence Properties of Advanced Materials、Inorganic Fluorides and Related Compounds、Advanced Photocatalysis Techniques

The poor water resistance property of a commercial Mn 4+ -activated narrow-band red-emitting fluoride phosphor restricts its promising applications in high-performance white LEDs and wide-gamut displays. Herein, we develop a structural rigidity-enhancing strategy using a novel KHF 2:Mn 4+ precursor as a Mn source to construct a proton-containing water-resistant phosphor K 2 (H)TiF 6:Mn 4+ (KHTFM). The parasitic [HMnF 6 ] − complexes in the interstitial site from the fall off the KHF 2:Mn 4+ are also transferred to the K 2 TiF 6 host by ion exchange to form KHTFM with rigid bonding networks, improving the water resistance and thermostability of the sample. The KHTFM sample retains at least 92% of the original emission value after 180 min of water immersion, while the non-water-resistant K 2 TiF 6:Mn 4+ (KTFM) phosphor maintains only 23%. Therefore, these findings not only illustrate the effect of protons on fluoride but also provide a novel insight into commercial water-resistant fluoride phosphors.