Oxy fluoride glass ceramics is a new up converted luminescent material with strong mechanical strength just like oxide and low phonon energy just like fluoride.

氟氧化物玻璃陶瓷是具有氧化物的机械性能和氟化物的低声子能量的新型上转换发光材料。

youdao

"At some level,debates like this never really end. Like,there are still people who believe that fluoride in water is a government plot."

VOA: standard.2010.03.23

Other fluids like fluoride salts can operate at high temperatures but at safer, lower pressures.

FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi

Yes I have seen the advocacy for Liquid Fluoride Thorium reactors and there are some apparent tantalizing advantages over current Uranium reactor designs like ability to burn plutonium as a starter fuel, less production of transuranics, higher fuel burn efficiencies, etc.

FORBES: The Future of Nuclear Power: Cheaper and Safer?