Morphology Control of Lanthanide Doped NaGdF4 Nanocrystals via One-Step Thermolysis

2019 
β-phase NaGdF4 nanocrystals doped with Er3+ and Yb3+ possessing diverse morphologies were synthesized from the co-thermolysis of trifluoroacetate precursors in 1-octadecene and oleic acid by modifying the hot-injection strategy. Modulation of the injection temperature during the hot-injection step was an effective approach to control the size and shape of the prepared nanocrystals and allowed for the direct synthesis of nanorods. Here, we report for the first time, the fabrication of monodispersed uniform nanorods through one-step thermolysis approach. The different supersaturation caused by the different temperatures could directly manipulate the nucleation and growth of α-phase nanoparticles before α→ β phase transition, subsequently influences the Ostwald ripening mode during the α→ β phase transition, and consequently affects their morphology (i.e. nanorods, nanospheres, nanoprisms, nanoplates, and nanodisks), uniformity and monodispersity. The upconversion luminescence intensity decreased with increa...
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