Synthesis, Characterization And Properties Study Of Multi-armed Conjugated Macromolecules

Multi-armed structure materials have attracted g great deal of attention due to their potential applications in organic optoelectronic devices and biological sensors self-assembly of fluorescence resonance energy transfer(FRET) which caused by their better optoelectric characteristics and solubility. Metal/organic interface has a effect on the perpormance of the device, the actions of the interface are the following:(1) adjust the work function of electrodes;(2) be selective about charge transport/collector;(3) adjust the relative polar of devices;(4) film morphology;(5) leakage currents and optical spacer layer. FRET promote the formation of self-assembled structures between donor and acceptor in light-harvesting system. Water/alcohol soluble interface materials and multi-armed structure of organic photoelectrical materials designed by our group in previous studies achieved good device performance.A novel series of donor-acceptor star-shaped conjugated macroelectrolytes(CMEs), denoted as 4FTs, including anionic carboxylic acid sodium groups(4FNaT), neutral diethanolamine groups(4FNOHT) and cationic ammonium groups(4FNBrT), were designed, synthesized, and explored as an excellent platform to investigate the impact of various polar pendent groups on self-assembly behaviors.The four-armed monodisperse fluorene-pyrene derivatives had shown good thermal stability and amorphous morphology. High photoluminescence yield, the excellent thermal stability and low water-oxygen sensitivity of SF-PyF and Py-PyF in neat films make them promising optical gain media. Therefore, low amplified spontaneous emission(ASE) thresholds,6.6 μJ/cm2(1.3 kW/cm2) at 451 nm for SF-PyF and 5.4 μJ/cm2(1.1 kW/cm2) at 490 nm for Py-PyF, were obtained.