Control of β-phase formation in polyfluorene thin films via Franck–Condon analysis

Khan, Amena L. T.; Banach, Michael J.; Köhler, Anna

doi:10.1016/s0379-6779(03)00244-3

Cited by 35 publications

(39 citation statements)

References 8 publications

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“…[20-23] Much effort has been devoted to explore the specific physical properties of the -phase of PFO, for instance, low triplet exciton yields, [24,25] good hole mobility, [26] high PL efficiency, [27] and intermolecular energy transfer.…”

Section: Page 2 Of 24 Confidential -Author Submitted Manuscript Nano-mentioning

confidence: 99%

Improving efficiency and color purity of poly(9,9-dioctylfluorene) through addition of a high boiling-point solvent of 1-chloronaphthalene

Liang

Zhao

et al. 2016

Nanotechnology

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In this work, -phase of poly(9,9-dioctyfluorene) (PFO) was used as a probe to study the effects of the addition of a high boiling point solvent of 1-chloronaphthalene on the nanostructures and electroluminescence of PFO films. Both absorption and photoluminescence spectra showed that the content of -phase in PFO film obviously enhanced as a result of the addition of a few amount of 1-chloronaphthalene into the processing solvent of p-xylenes. Apparently rougher morphology associated with the effectively enhanced ordering of polymer chains across the entire film was observed for films processed from p-xylene solutions consisting of a certain amount of 1-chloronaphthalene, as revealed by atomic force microscopy and grazing incidence X-ray diffraction measurements. In addition to the effects of the nanostructures of films, of particular interests is that the performance and color purity of polymer light-emitting device can be noticeably enhanced upon the addition of 1-chloronaphthalene additive. These observations highlight the importance of control the nanostructures of emissive layer, and demonstrate the addition of a few volume ratio of high boiling point additive can be a promising strategy to attain high performance polymer light emitting diodes.

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Section: Page 2 Of 24 Confidential -Author Submitted Manuscript Nano-mentioning

confidence: 99%

Improving efficiency and color purity of poly(9,9-dioctylfluorene) through addition of a high boiling-point solvent of 1-chloronaphthalene

Liang

Zhao

et al. 2016

Nanotechnology

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“…O comportamento da lacuna de energia em função do comprimento pode ser descrito pela seguinte expressão, (GIERSCHNER et al, 2002;SRIWICHITKAMOL et al, 2006;CHANG et al, 2000) O espectro de emissão (ℏ ) de fótons/intervalo de energia pode ser modelado pela seguinte equação (POPE et al, 1999;HO et al, 2001;KHAN et al, 2003): (FACETO, 2007).…”

Section: Estrutura Eletrônicaunclassified

“…Filmes ultrafinos produzidos a partir de uma solução de PFO diluída em clorofórmio possuem estrutura molecular completamente amorfa quando preparadas à temperatura ambiente (KHAN et al, 2003;ARIU, et al, 2003). Na literatura é visto que a fase β pode ser gerada em filmes finos a partir de soluções de PFO diluídas em solventes pobres (alta polaridade) como tolueno, isodureno e ciclopentanone (VALENTE, 2012;KHAN et al, 2004;KHAN et al, 2003).…”

Section: )unclassified

“…Na literatura é visto que a fase β pode ser gerada em filmes finos a partir de soluções de PFO diluídas em solventes pobres (alta polaridade) como tolueno, isodureno e ciclopentanone (VALENTE, 2012;KHAN et al, 2004;KHAN et al, 2003). Além disso, a fase β pode ser gerada em filmes de PFO preparados na fase amorfa a partir de tratamento em vapor de tolueno.…”

Section: )unclassified

“…Pode-se observar que os espectros de absorbância possuem, além da banda conjugada típica associada à fase não planar em torno de 405 nm, uma nova estrutura espectral em torno de 435 nm (2,85 eV) com peso espectral que aumenta com o decréscimo da espessura dos filmes de PFO que é atribuída à fase β na literatura (GRELL et al,1999;KHAN et al, 2003;ARIU et al, 2003). Valente e colaboradores (VALENTE, 2012) utilizaram um procedimento para determinar a fração de fase  em um filme sugerido por Ariu (ARIU et al, 2003) que consiste em comparar a área do espectro de absorção de um filme contendo apenas a fase amorfa ( não planar) com outro que possui a fase  embebida na fase amorfa.…”

Section: Espectroscopia De Fotoluminescência a Temperatura De 5kunclassified

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Estudo das propriedades ópticas e estruturais de polifluorenos por meio de espectroscopia de filmes ultrafinos e de moléculas isoladas

Araújo¹

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Stable Blue Emission from a Polyfluorene/Layered‐Compound Guest/Host Nanocomposite

Aharon

Albo

Kalina

et al. 2006

Adv Funct Materials

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In this study a blue‐light‐emitting conjugated polymer, poly(9,9‐dioctylfluorene), is confined to the interlayer space of inorganic, layered metal dichalcogenide materials, metallic MoS2, and semiconducting SnS2. The nanocomposites are prepared through Li intercalation into the inorganic compound, exfoliation, and restacking in the presence of the polymer. X‐ray diffraction and optical absorption measurements indicate that a single conjugated polymer monolayer, with an overall extended planar morphology conformation, is isolated between the inorganic sheets, so that polymer aggregation or π–π interchain interactions are significantly reduced. Photoluminescence (PL) measurements show that the appearance of the undesirable green emission observed in pristine polymer films is suppressed by incorporating the polymer into the inorganic matrix. The blue emission of the intercalated polymer is stable for extended periods of time, over two years, under ambient conditions. Furthermore, the green emission is absent in the PL spectra of nanocomposite films heated at 100 °C for 7 h in air with direct excitation of the keto defect. Finally, no green emission was observed in the electroluminescence spectrum of light‐emitting devices fabricated with a polymer‐intercalated SnS2 nanocomposite film. These results support the proposed hypothesis that fluorenone defects alone are insufficient to generate the green emission and that interchain interactions are also required.

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Control of β-phase formation in polyfluorene thin films via Franck–Condon analysis

Cited by 35 publications

References 8 publications

Improving efficiency and color purity of poly(9,9-dioctylfluorene) through addition of a high boiling-point solvent of 1-chloronaphthalene

Improving efficiency and color purity of poly(9,9-dioctylfluorene) through addition of a high boiling-point solvent of 1-chloronaphthalene

Estudo das propriedades ópticas e estruturais de polifluorenos por meio de espectroscopia de filmes ultrafinos e de moléculas isoladas

Stable Blue Emission from a Polyfluorene/Layered‐Compound Guest/Host Nanocomposite

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