  Incorporating with inhomogeneous phases with high electroluminescence (EL)
intensity to prepare smart meta-superconductors (SMSCs) is an effective method
of increasing the superconducting transition temperature (Tc) and has been
confirmed in both MgB2 and Bi(Pb)SrCaCuO systems. However, the increase of
{\Delta}Tc has been quite small because of the low optimal concentrations of
inhomogeneous phases. In this work, three kinds of MgB2 raw materials, namely,
aMgB2, bMgB2, and cMgB2, were prepared with particle sizes decreasing in order.
Inhomogeneous phases, Y2O3:Eu3+ and Y2O3:Eu3+/Ag, were also prepared and doped
into MgB2 to study the influence of doping concentration on the {\Delta}Tc of
MgB2 with different particle sizes. Results show that reducing the MgB2
particle size increases the optimal doping concentration of inhomogeneous
phases, thereby increasing {\Delta}Tc. The optimal doping concentrations for
aMgB2, bMgB2, and cMgB2 are 0.5%, 0.8%, and 1.2%, respectively. The
corresponding {\Delta}Tc values are 0.4, 0.9, and 1.2 K, respectively. This
work open a new approach to reinforcing increase of {\Delta}Tc in MgB2 SMSCs.
