Two methods were used to assemble organic molecule 8 hydroxyquinoline aluminum (Alq 3) into the pores of porous silicon (PS) which was prepared by anodization.In the first way,Alq 3 was impregnated into the pores by physical adsorption when a fresh PS sample was immerged into chloroform solution of Alq 3.In the second way,PS was immerged into aqueous solution of Al 2(SO 4) 3,Alq 3 was obtained in the pores by chemical reaction when methanol solution of 8 hydroxyquinoline was slowly injected.The photoluminescent (PL) spectra showed blue shift and narrower bandwidth relative to the PL of Alq 3 film on silicon wafer.PL intensity of the reaction sample was much higher than that of the impregnation sample.These results indicated that PL spectrum of Alq 3 was confined in the prores and the first way was more effective than the second one.