Uniform Terbium Coordination Polymer Microspheres: Preparation and Luminescence.

Uniform terbium coordination polymer microsphere particles are synthesized via a facile solvothermal method, using 3-methyl benzoic acid (3-MeBAH) as ligand. The products were characterized by SEM, PXRD, EA, FT-IR, downconversion and upconversion luminescence. PXRD result confirms that sample 1 has one dimensional structure, which is constructed by dinuclear second building unit. The effect factors of reaction temperature and reaction time in synthesizing the uniform microsphere particles were investigated in detail. Downconversion luminescence research shows the sample 1 exhibits characteristic transitions at 488, 544, 585, 621 and 636 nm, which corresponding to the transitions of D → F, D → F, D → F, D → F and D → F of Tb respectively, and the strongest peak is at 544 nm. The absolute luminescence quantum yield of sample 1 is as high as 32.7 %. Furthermore, investigation indicates the upconversion luminescence of sample 1 is the two-photo absorption of the ligand. [ABSTRACT FROM AUTHOR]