Abstract
Monodisperse, core-shell-structured particles were prepared by the sol-gel method. The samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, photoluminescence (PL), and low-voltage cathodoluminescence (CL) as well as time-resolved PL spectra and lifetimes. PL and CL study revealed that the core-shell-structured particles show strong red emission dominated by the transition of at with a lifetime of . The PL and CL emission intensity can be tuned by the coating number of phosphor layers on and by accelerating voltage and the filament current, respectively.
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