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Organization of luminescent molecular-scale hybrids with double strong chemical bonds from modification of a functional bridge

BING YAN1,* , QIAN-MING WANG1

Affiliation

  1. Department of Chemistry, Tongji University, Siping Road 1239 Shanghai 200092, China

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 Tb3+ 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 4fN and 4fN-15d1configurations. 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 Tb3+. Accordingly, the intramolecular energy transfer mechanism runs smoothly within these molecular-based hybrids and strong green emission of Tb3+ has been achieved..

Keywords

Non-crystalline materials, Optical materials, Sol-gel synthesis, Luminescence, Microstructure, Optical properties.

Submitted at: Sept. 21, 2007
Accepted at: Dec. 7, 2007

Citation

BING YAN, QIAN-MING WANG, Organization of luminescent molecular-scale hybrids with double strong chemical bonds from modification of a functional bridge, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3907-3911 (2007)