Abstract: Nanocrystals and powders of KMgF₃ doped with Eu²⁺ were synthesized by the microemulsion method and the solvothermal process, respectively. The emission and excitation spectra of KMgF₃:Eu²⁺ phosphors were measured and compared with those of the samples synthesized through a solid state reaction, Bridgman-Stockbarger method, and mild hydrothermal technique. The KMgF₃:Eu²⁺ samples synthesized by means of the microemulsion method and the solvothermal process show only a sharp emission peak located at 360 nm in the emission spectra, which arises from the f→f(⁶P7/2→⁸S7/2) transition of Eu²⁺. The broad emission bands appear at 420 nm, which arises from Eu²⁺←O^2- cannot be observed(in the mild hydrothermal and single crystal samples, the emission peak at 420 nm besides the emission of Eu²⁺ at 360 nm is observed). In the excitation spectrum of the KMgF₃:Eu²⁺ samples synthesized by the microemulsion method and the solvothermal process, the excitation peaks show an intensive blue shift. The blue shift can be attributed to the lower oxygenic content in the KMgF₃:Eu²⁺ samples synthesized by the microemulsion method and the solvothermal process.

Key words: KMgF₃：Eu(Ⅱ) phosphor Optical property, Microemulsion Solvothermal process Nanocrystal