Aggregation-induced emission of tetraphenylethylene derivatives and their blends with poly(methyl methacrylate)

POLY 522

Yuning Hong1, Hui Tong1, Yongqiang Dong1, Matthias Häußler1, Jacky Wing Yip Lam1, and Ben Zhong Tang, tangbenz@ust.hk2. (1) Department of Chemistry, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China, (2) Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China

Tetraphenylethylenes derivatives 1,2-bis(4-bromophenyl)-1,2-diphenyl-E-ethene (1) and 1,2-bis(4-methoxyphenyl)-1,2-diphenyl-E-ethene (2) are synthesized. When the molecules are molecularly dissolved in acetonitrile, they are practically nonemissive ("off"). When a non-solvent of water is added, they aggregate and emit intensely ("on"). The quantum efficiency increases with an increase in the added amount of water. Even when they are blended with poly(methyl methacrylate), the resultant films still show bright emissions.