The encapsulation of a rare earth (RE) complex Eu(DBM)_3phen in modified Si- MCM41 with 3 -aminopropyltriethoxy st.lane is reported for the first time. The luminescence intensity of the RE complex in the modified Si-MCM-41 is about 9 times as strong as in unmodified Si- MCM41 and the luminescence of the RE complex in the modified Si-MCM-41 has good color purity.