TIAN Gao, WU Chao, LIU Qi, ZHOU Jing, CHEN Wen

(Institute of Materials Science and Engineering, Wuhan University of Technology, 430070)

Abstract: Nanosized mesoporous molecular sieve MCM- 41 was synthesized with tetraethyl orthosilicate (TEOS) as the source of silica and cetyltrime - thylammonium bromide (CTAB) as the template. The photolumines cent functional supramolecule Eu (DBM)₃ phen/APTES- MCM- 41 was prepared in chloroform, in which Eu(DBM)₃phen as guest and MCM- 41 as host. Materi- als were characterized by XRD, HRTEM, IR and fluores cent spectros copy. Results reflect, photolumines cent purity increas ed after Eu(DBM)₃phen incorporated into APTES- MCM- 41 pore channel. This is mainly becaus e - NH₂ ligands on the surface of APTES - MCM- 41 largely influence ligand field around Eu³⁺. Becaus e of the disturbance of ligand field, the symmetry of Eu (DBM)₃phen largely decreased, leading to the increasing of photolumines cent purity. Meanwhile, result reflects the photolumi- nescent intensity of Eu(DBM)₃phen/APTES - MCM- 41 increas es as the incorporation of Eu³⁺ increases.

Keywords: rare earths, mesoporous, composite, photolumines cence