Efficient Photoluminescence and Electroluminescence from a Soluble Polyfluorene

Pei, Qibing; Yang, Yang

doi:10.1021/ja9615233

Cited by 811 publications

(533 citation statements)

References 14 publications

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“…The monomer, 2,7-dibromo-9,9-bis(3,6-dioxaheptyl) fluorene was synthesized following ref. 7. Polymerization was carried out using Yamamoto coupling mainly according to ref.…”

Section: Methodsmentioning

confidence: 99%

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Single-molecule electroluminescence and photoluminescence of polyfluorene unveils the photophysics behind the green emission band

et al. 2014

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Optoelectronic properties of polyfluorene, a blue light-emitting organic semiconductor, are often degraded by the presence of green emission that originates mainly from oxidation of the polymer. Here, we use single-molecule electroluminescence (EL) and photoluminescence (PL) spectroscopy on polyfluorene chains confined in vertical cylinders of a phase-separated block copolymer to spectrally resolve the green band and investigate in detail the photophysical processes responsible for its appearance. In both EL and PL, a substantial fraction of polyfluorene chains shows spectrally stable green emission which is ascribed to a keto defect. In addition, in EL, we observe a new type of vibrationally resolved spectra distributed over a wide range of frequencies and showing strong spectral dynamics. Based on quantum chemical calculations, this type is proposed to originate from charge-assisted formation and stabilization of ground-state aggregates. The results are expected to have broad implications in the fields of photophysics and material design of polyfluorene materials.

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“…The monomer, 2,7-dibromo-9,9-bis(3,6-dioxaheptyl) fluorene was synthesized following ref. 7. Polymerization was carried out using Yamamoto coupling mainly according to ref.…”

Section: Methodsmentioning

confidence: 99%

“…Technologically, the problem can be solved by suitable material design 6 and device fabrication technology. In the initial studies, the origin of the green band has been ascribed to the formation of excited state aggregates, excimers 7,8 . Excimers have been known to form in concentrated solutions of fluorene monomers 9 as well as of polyfluorenes 10 .…”

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confidence: 99%

Single-molecule electroluminescence and photoluminescence of polyfluorene unveils the photophysics behind the green emission band

et al. 2014

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“…[1][2][3] Pioneering work on the synthesis of soluble PFs was published in the late 1980s by Yoshino et al 4,5 using FeCl 3 -mediated oxidative coupling. Regioregular PFs were prepared first by nickel-catalyzed Yamamoto coupling of 2,7-dibromofluorene derivatives 6 and shortly afterwards by palladium-catalyzed Suzuki coupling reactions of 2,7-dibromofluorene and 2,7-diboronylfluorene derivatives. 7,8 These two methodologies represent the most important routes toward PFs and PF-based polymers today.…”

Section: Introductionmentioning

confidence: 99%

Preparation of poly(fluorene)s using trans‐bis(dicyclohexylamine)palladium diacetate as a catalyst: Scope and limitations

Kappaun

Zelzer

Bartl

et al. 2006

J. Polym. Sci. A Polym. Chem.

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“…Los polímeros conjugados fluorescentes con cadena principal de 2,7-fluoreno están siendo objeto de atención como componentes moleculares en la preparación de dispositivos optoelectrónicos (1)(2)(3)(4)(5)(6). La gran versatibilidad en la preparación y modificación estructural los hace candidatos excelentes para estudiar el efecto que producen en las propiedades del material.…”

Section: Introductionunclassified

Películas fluorescentes azules basadas en derivados de poli-2,7-fluorenofenilideno

Mallavia¹,

Martínez-Pérez²,

Chmelka³

et al. 2004

Bol. Soc. Esp. Ceram. Vidr.

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La cuaternización del poli-(9,9-bis(6'-bromohexilo)fluorenofenileno) por tratamiento de trimetilamina gaseosa se emplea para obtener una sal de amonio del copolímero precursor soluble en agua. El copolímero neutro contiene unidades alternantes repetitivas de fluoreno/ fenilideno obtenidas mediante una acoplamiento de Suzuki con Pd (II). Los polímeros se caracterizaron por cromatografía de permeación (GPC), espectroscopia RMN de 1 H y 13 C , espectroscopia IR transformada de Fourier y análisis termogravimétrico (ATG). El polímero neutro mantiene la estabilidad hasta los 300ºC, mientras el derivado catiónico comienza a descomponer a 120ºC, con una progresiva perdida de masa hasta los 290ºC. Las propiedades ópticas de los polímeros se estudiaron en disolución y en películas mediante espectroscopias UV/VIS y de fluorescencia. Las películas delgadas de sílice mesoporosa se prepararon como materiales receptores de los copolímeros fluorescentes. Palabras clave: Polímeros conjugados, solubles en agua, Pd(II), sílice mesoporosa.Blue fluorescent films based on poly-2,7-fluorene-phenylene derivatives.Quaternization of poly-(9,9-bis(6'-bromohexyl)fluorenephenylene by treatment with trimethylamine gas was used to obtain a water soluble ammonium salt copolymer. The neutral copolymer containing fluorene/phenylene alternating repeating units was obtained by a palladiumcatalyzed Suzuki coupling reaction. This strategy could be applied to prepare water soluble conjugated polymers with the ability to change the charge functionality. The polymers were characterized by gel permeation chromatography (GPC), 1 H and 13 C NMR spectroscopy, FT-IR spectroscopy, and thermogravimetric analysis (TGA). The neutral polymer was stable to over 300ºC, while the cationic polymer begins to degrade at 120ºC with a progressive loss of mass at 290ºC. The optical properties of the polymers were investigated in solution and solid phases by UV/VIS and fluorescent spectroscopy. Mesoporous silica thin films were prepared as a host matrix for the fluorescent copolymers.

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Efficient Photoluminescence and Electroluminescence from a Soluble Polyfluorene

Cited by 811 publications

References 14 publications

Single-molecule electroluminescence and photoluminescence of polyfluorene unveils the photophysics behind the green emission band

Single-molecule electroluminescence and photoluminescence of polyfluorene unveils the photophysics behind the green emission band

Preparation of poly(fluorene)s using trans‐bis(dicyclohexylamine)palladium diacetate as a catalyst: Scope and limitations

Películas fluorescentes azules basadas en derivados de poli-2,7-fluorenofenilideno

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