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This work describes a novel ionic liquid (IL)‐assisted synthesis strategy for a direct and easy production of Eu2+‐doped nanoparticles (NPs), where ILs are also used as fluoride sources to avoid the use of elemental fluorine or toxic hydrofluoric acid. Up to now, the direct synthesis of Eu2+‐doped nanophosphors consisted of an enormous challenge, due to the oxidation to Eu3+ observed in hydrous solution,...
In article number 1703707, Claudia Wickleder and co‐workers prevent the formation of Eu3+ during the synthesis of Eu2+ phosphors in the relative redox stable ionic liquid (IL) BmimBF4, and allow the direct precipitation of nanoparticles (NPs) from Eu2+ starting materials. Eu2+ NPs, e.g., BaFCl:Eu2+, are prepared by means of two different synthetic routes in ILs in air.
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