Citation: XU Zou-Ming, WANG Yu-Xia, DAI Peng, KONG Wei-Quan. Efficient Blue Emission from Small-Molecule Organosilicon Monomer N-(3-Trimethoxysilylethyl)ethylenediamine[J]. Acta Physico-Chimica Sinica, ;2012, 28(03): 733-738. doi: 10.3866/PKU.WHXB201201131
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We investigated the electronic structure, photophysical properties, and thermal stability of N- (3-trimethoxysilylethyl)ethylenediamine (TMSEEDA). The optimized structural parameters in the ground state and first excited state were obtained from density functional theory calculations. The results showed that there was probably π electron delocalization within the Si-O skeleton, which induced the long wavelength absorption. A broad and intense blue emission with a maximum at 430 nm was observed for both the solution and the solid state with 270 nm excitation at room temperature. The absorption intensity for the solid state was five-times that of the pure TMSEEDA. For the ethanol solution, the photoluminescence intensity increased with increasing concentration of TMSEEDA and reached a maximum at a concentration of 100%. These results suggest there is no concentration quenching for TMSEEDA. An accepted model of electron delocalization and d-p π-bonding within the Si-O skeleton was applied to explain the long wavelength absorption and blue emission.
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