In this work

a star-shaped light-harvesting concept is supported by the -cyclodextrin grafting polymer with 21 arms of poly(9

9-diethylfluoren-2-yl methyl methacrylate)-b-poly(N

N-dimethyl aminoethyl methacrylate) [-CD-g-(PFMMA-b-PDMAEMA)21] as a host molecule and anthracene as guest.The inner layer of FMMA units acts as antennae to absorb light energy and transfers inward to anthracene molecules included in hollow -CD cage.The intensity of energy transfer depends on the inclusion of anthracene in -CD core

which is sensitive to tetrahydrofuran fraction in aqueous solution.With the decreasing tetrahydrofuran concentration

the energy transfer from FMMA to anthracene increases linearly

i.e. a decrease of FMMA luminescence and an increase of anthracene emission in aqueous solution.The polymer is characterized by1H-NMR

MALDI-ToF-MS and GPC

and the energy absorption and transfer are investigated by UV-Vis and fluorescent analyses.1H-NMR and GPC measurements prove that each arm of the star polymer contains a block copolymer of 4.4 FMMA units and a long PDMAEMA segment.Such a light-harvesting system shows a promising potential in light-responsive equipment

solar cell or organic light-emitting diodes.