Abstract
Uniform and well-crystallized octahedral microcrystals have been successfully synthesized by a facile one-step hydrothermal synthesis method without involving any templates. The prepared samples were systematically characterized by powder X-ray diffraction, field-emission-scanning electron microscopy, photoluminescence (PL), and photoluminescent excitation spectra. The starting pH value played an important role in the pure-phase formation and uniform morphology of octahedral microcrystals. Detailed proofs indicated that the growth process of microcrystals was dominated by a nucleation–crystallization-oriented attachment mechanism. Furthermore, the luminescent properties of the as-synthesized microcrystals were investigated, demonstrating that the PL intensity was influenced by the different morphologies, and the bipyramidal octahedra luminescent microcrystals might be applied as an excellent red component for near-UV white light emitting diodes.
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