Abstract
Fluorite phase Sr2LaF7 nanocrystals (NCs) were synthesized via solvothermal method using oleic acid as capping ligands. The effects of preparing conditions on the phase structure, crystal size, morphology, and upconversion (UC) emission properties of the products were studied. The results reveal that just apropos NaOH content facilitates the growth of near-monodispersed pure phase Sr2LaF7 NCs, and Yb3+ doping is favorable to the formation of pure Sr2LaF7 phase with more uniform size distribution. The average crystalline size of the products can be controlled less than 10nm. Following appropriate lanthanide ions doping, the NCs show intense blue, yellow, and white-color UC emission under the excitation of a 980nm laser. The energy transfer UC mechanisms for the fluorescent intensity were also investigated.
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