Synthesis and Characterization of Carbazole–Fluorene–Silole Copolymers as Efficient Green Light Emitting Diodes

Liu, Zhitian; Liu, Jing; Yu, Guo-Wei; Lei, Gangtie; Qi, Xin

doi:10.1007/s10904-012-9773-x

Cited by 4 publications

(4 citation statements)

References 49 publications

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“…67 Furthermore, a series of green emission polyfluorene-carbazole-siloles 151a-d were fabricated into PLED devices with the configuration of ITO/PEDOT (40 nm)/151 (80 nm)/ TPBi (30 nm)/CsF/Al. 71 With 151c as the emissive layer, a high maximum external quantum efficiency of 2.33%, a maximum current efficiency of 6.62 cd A À1 , and a maximum brightness of 3857 cd m À2 were achieved.…”

Section: Electroluminescence Devicesmentioning

confidence: 99%

“…70 A series of green-emissive soluble conjugated polyfluorene-carbazole-silole-containing random copolymers 151a-d were successfully synthesized by the Pd(0)catalyzed Suzuki coupling reaction, where the sum of the molar ratios of 149 and 150 was kept constant, while their ratio was tuned (Scheme 22B). 71 In dichloromethane solutions, 151a-b with less silole content exhibit the combined contribution from carbazole and fluorene and emit at B420 nm, while the PL peaks of 151c-d show a bathochromic shift to 520 nm, which is attributed to the silole emission. In the thin film state, the blue emissions of 151a-b from the carbazole and fluorene blocks are weakened and the PL spectra display a greenish-blue emission at 470 and 481 nm, respectively.…”

Section: Suzuki Polycouplingmentioning

confidence: 99%

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AIE macromolecules: syntheses, structures and functionalities

2014

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Macromolecules with aggregation-induced emission (AIE) attributes are a class of luminescent materials that display enhanced emission when they are aggregated. They have attracted much attention because of their good solubility, processability, high emission efficiency in the aggregated states, etc. A large variety of AIE macromolecules have been developed, showing exponential growth of research interest in this field. This review summarizes the design principles and recent synthetic advancements, topological structures, as well as the frontiers of functionalities and potential applications of AIE macromolecules, especially fluorescence sensing, biological applications and optoelectronic applications, with an emphasis on the recent progress. New luminogenic systems without conventional chromophores displaying aggregated state emission are discussed. The highly dense clusters of heteroatoms with lone pair electrons in these systems may serve as the chromophore and are cited as "heterodox clusters". It is expected that the mechanistic insights into the AIE phenomena, based on the restriction of intramolecular motions and structure rigidification, can guide the future design of AIE materials with fascinating structures and functionalities.

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Section: Electroluminescence Devicesmentioning

confidence: 99%

Section: Suzuki Polycouplingmentioning

confidence: 99%

AIE macromolecules: syntheses, structures and functionalities

2014

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“…Polymers PFCFS10 and PFCFS20 display very similar PL emissions with k PL at 475 nm and left shoulders at *455 nm. In comparison to the green PL emissions of films of many reported TPS-containing copolymers [28][29][30][31][32][33][34], the blue PL emissions of films of PFCFS1-20 well demonstrate the different light-emitting property of the fluorinated TPS as building blocks on the conjugated main chain. The results also suggest that the introductions of 3-fluorobenzenes at 3,4-positions of silole ring may decrease the conjugation length of a TPS, supplying the blue-emissive property of the fluorinated TPS in PFSFC1-20.…”

Section: Photoluminescence Propertymentioning

confidence: 86%

“…2,3,4,5-Tetraphenylsiloles (TPS) have shown unique aggregation-induced emission (AIE) [21][22][23][24][25][26], and there are several reports for the synthesis and light emissions of conjugated TPS-containing polymers [27][28][29][30][31][32][33][34]. Normally, solids of TPS small molecules emit blue or blue-greenish light.…”

Section: Introductionmentioning

confidence: 99%

Efficient Blue Light-Emitting Diodes Based on Conjugated Polymers with Fluorinated Silole Chemically Doped in Fluorene–Carbazole Main Chain

Zhang

Liu

Zhang

et al. 2014

J Inorg Organomet Polym

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A series of random conjugated copolymers PFCFS1-20 with 2,5-diphenyl-3,4-bis(3-fluorophenyl)-silole (fluorinated TPS) chemically doped in 2,7-fluorene-2,7-carbazole main chain were successfully synthesized and characterized. Polymers PFCFS1-20 with fluorinated TPS contents from 1 to 20 % possess high weight-average molecular weights between 63.5 and 114.1 kg mol -1 . The absorption spectra of THF solutions and films of PFCFS1-20 are very similar, showing peaks around 385 nm and optical band gaps around 2.87 eV. Almost no red-shifts of the absorption peaks from a solution to a solid state film for the four copolymers indicate that their interchain interactions are extremely weak. PFCFS1-20 solutions show blue emissions with very limited intrachain excitation energy transfers. The films of PFCFS1-20 also display blue emissions with main peaks at 449 nm for PFCFS1 and 475 nm for PFCFS20, suggesting that the fluorinated TPS may comprise more twisted phenyl peripherals. Two types of electroluminescence (EL) devices with configurations of ITO/PEDOT:PSS/PFCFS/CsF/Al and ITO/PEDOT:PSS/ PFCFS/TPBI/CsF/Al were investigated. It was found that PFCFS1-20 in the two types of EL devices could show blue to sky-blue emissions. Among PFCFS1-20, for EL devices without TPBI layer, PFCFS5 possesses the best device performances with maximum luminous efficiency (LE max ) of 1.46 cd A -1 and maximum external quantum efficiency (EQE max ) of 0.93 %. The insertion of TPBI as the electron transport layer remarkably improves the EL performances. Also PFCFS5 displays the best LE max of 4.59 cd A -1 and EQE max of 3.21 %. The latter one is among the best efficiency so far reported for silole-containing polymers. Our results suggest that the fluorinated TPS is an efficient chromophore for constructions of blue-emissive conjugated polymers.

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