A core-shell cobalt ferrite/silicon dioxide/europium ion-doped
composite was synthesized by a facile layer-by-layer method.
Magnetization of the composite under an external magnetic field of
approximately 0.25 T enhanced the photoluminescence (PL) intensity by
56%. The remanent magnetization of the CoFe2O4
core increased the excited charge-transfer transition between
O2- and Eu3+ in the
Y2O3:Eu3+ shell, thus enhancing the
probability of radiative transition
Eu3+ ions and leading to enhanced PL. Remanent magnetization
is a noncontact, easy-to-operate technique with high growth amplitude
and potential for practical application for smart display devices.