YF3 is an efficient host lattice for the luminescence emission of many optically active lanthanide ions[1-2].Well-dispersed YF3∶Eu3+ architectures with different morphologies are obtained via low temperature solid-state reaction process by tuning the fluoride source.With increase of the calcination temperature from 400℃ to 1000℃, the products undergo an obvious matrix transformation from yttrium fluoride to yttrium oxide fluoride, and then yttrium oxide.The local symmetry of optical active Eu3+ ions decreases with increase of calcination temperature at lower calcination temperature region, and then keeps almost tmchanged when the temperature is over 700℃.Different luminescent properties of the as-prepared YF3∶Eu3+ architectures and the products calcinated at different calcination temperatures are observed even for the samples with the same contents.The study may have special significance to the large-scale fabrication of other lanthanide fluoride luminescent materials.