B. Yan, Qianming Wang
2007
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0
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Journal
Journal of Optoelectronics and Advanced Materials
Abstract
2-chlorobenzoic acid was modified by (3-aminopropyl)triethoxysilane to behave as a intermediate and prepared their corresponding organic-inorganic molecular-based hybrid material with the two components equipped with covalent bonds . The critical point is that the derivative of chlorobenzoic acid which is not confined only to coordinate to Tb 3+ but is capable of undergoing hydrolysis and polymerization or cross-linking reactions with two ethoxy groups (both CBA-Si and TEOS) by Si-O bonds. According to the Judd-Ofelt theory, covalency increases with increasing reciprocal energy difference between the 4f N and 4f N-1 5d 1 configurations. Ultraviolet absorption, phosphorescence spectra, and luminescence spectra were applied to provide supplementary information about the photophysical properties of the obtained hybrid material and the above spectroscopic data reveal that the triplet energy of modified chlorobenzoic acid matches with the emissive energy level of Tb 3+ . Accordingly, the intramolecular energy transfer mechanism runs smoothly within these molecular-based hybrids and strong green emission of Tb 3+ has been achieved.