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Hydrothermal synthesis and photoluminescent properties of rod-shape assemblies of LaBO3:Eu3+ nanocrystals.

Uniform and assembled LaBO3 nanocrystals have been successfully synthesized via a facile hydrothermal method. These assemblies exhibit a rod-shape morphology and each of them consists of small LaBO3 nanocrystals which are tightly attached together. The phase, surface and morphology of these assemblies have been characterized. A possible assembly mechanism of such morphology is also proposed through investigation on the formation process. Photoluminescent spectra suggest that these assemblies doped with Eu3+ can give stronger red emissions than the orange one due to its aragonite structure. Such emission has been explained by the Judd-Ofelt theory. It is expected that these well-defined LaBO3 assemblies could find applications in future luminescent displays and lamps.