Uniform Terbium Coordination Polymer Microspheres: Preparation and Luminescence
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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 5D4 → 7F6, 5D4 → 7F5, 5D4 → 7F4, 5D4 → 7F3 and 5D4 → 7F2 of Tb3+ 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.
KeywordsTerbium Coordination polymer Microspheres Luminescence
The authors acknowledge the financial support of the Open Project Program of Key Laboratory of Functional Small Organic Molecule, Ministry of Education (No. KLFS-KF-201422), Jiangxi Normal University (No. 5616).