In order to investigate the explicit electro-optical properties and self-assembly variations of photoluminescent polymers under different micro-environments

three multiple and environmental responsive polyfluorene-based blue light-emitting copolymers (Pa

Pb and Pc) were successfully synthesized through Suzuki coupling reaction.The molecular structures of the copolymers were fully characterized by 1H-NMR

13C-NMR

elemental analysis and gel-permeation chromatograph

respectively.The photophysical properties and self-assembly behaviors of polymers Pa

Pb and Pc were examined through UV-Vis absorption

photoluminescent smission spectra

dynamic laser light scattering and transmission electron microscopy.The experimental results indicated that the polymers took on wide band gap of 3.09 eV with blue emission in thin solid films.The photoluminescent changing of copolymers in different solvents or temperature were studied to correlate the aggregation-induced emission properties with the chemical structures of copolymers

and it was found that the aggregation induced emission properties of polymers Pa

Pb and Pc were determined by the volume proportion of water in the mixture solvent of water and tetrahydrofuran.The size and morphology of the vesicles formed from polymer Pa

Pb and Pc can be effectively tuned in a range of 900 nm to 10 nm.It can further make polymer P-N to be water-soluble and temperature-responsive by introducing poly(N-isopropyl acrylamide) into the main chain of polymer Pb through atom transfer radical polymerization.The photoluminescent emission profile of polymer P-N is adjusted by changing the temperature of polymer P-N in tetrahydrofuran

while the size of the formed vesicle in the mixture solvent of water and tetrahydrofuran is increased when the temperatures of polymer P-N in the mixture solvents are below or above lower critical solution temperature of poly(N-isopropyl acrylamide).This work can serve as an excellent exploratory example for the fine self-assembly control principle in the amphiphilic photoluminescent copolymers with branched and diversified side chains through the multiple weak interactions of polyfluorene-based -conjugated copolymers.