Reduced Excimer Formation in Polyfluorenes by Introducing Coil-like Poly[penta(ethylene glycol) methyl ether methacrylate] Block Segments

Macrostructural order and optical properties of polyfluorene-based polymer films

“…8,9 Interpolymer excimer formation of p-conjugated polymer films is a particularly important factor in device fabrication. 10,11 To our knowledge, fluorene homopolymers such as poly(9,9-dioctylfluorene), POF, show only slight excimeric properties in the film state, 12 although alternating copolymers such as poly(9,9-difluorofluorene-alt-9,9-dioctylfluorene), P(FF-alt-OF), previously prepared in our laboratory (Scheme 1), exhibit characteristic optoelectronic properties such as interpolymer excimer formation in highly concentrated solutions, intramolecular charge transfer and good n-type character. 13,14 Excimer formation in highly concentrated solutions implies that the alternating fluorene-based copolymers promote p-p stacking and crystallization more efficiently than fluorene homopolymers.…”

Morphological Transformation and Photophysical Properties of Polyfluorene-Based Luminescent Rod-Coil Block Copolymers

“…During annealing, enhanced emission in the 500-600 nm range is commonly attributed to the formation of fluorenone or excimers [25,26]. To investigate the enhanced PL emission, we employed infrared spectroscopy to determine the thermal stability of the PF-Br macroinitiator (Figure 9).…”

Synthesis and Morphological Transformation of Conjugated Amphiphilic Diblock Copolymers in Mixed Solvents

“…e emission of PF-Br at 525 nm is much stronger than that of PF 10 -P2VP 75 , which means that PF 10 -P2VP 75 possesses better spectral stability at higher temperatures. e enhanced stability is probably due to the fact that the P2VP coil suppresses the formation of excimers in the PF blocks during annealing at high temperatures [40].…”

“…Although PF is a promising material for light-emitting diodes, PF chains tend to stack cofacially and form excimers due to intermolecular -interaction, which results in nonradiative decay and a subsequent reduction in the performance of devices. A diblock architecture is one possible solution to lower the intermolecular interaction in PF and suppress the formation of excimers [34]. Moreover, the photophysical properties are possibly in�uenced strongly by variations in the morphology of rod-coil copolymers.…”