Synthesis and properties of polyfluorene, containing oxadiazole and carbazole units as pendants for white light-emitting diodes

Jin, Youngeup; Song, Suhee; Kim, Jin Young; Kim, Hee Joo; Lee, Kwanghee; Suh, Hongsuk

doi:10.1016/j.tsf.2008.02.034

Cited by 11 publications

(4 citation statements)

References 41 publications

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“…Compared to the PL spectra in the neat films, the EL may be attributed to the excimer emission of these PF derivatives 20. It is suggested that the donor–acceptor effect in these PF derivatives plays a much important role in the excimer formation and emission under electric field 24. Unlike the significantly changed PL spectra in the neat films, the EL spectra have little change with increasing FIr(pic) units for these PF derivatives.…”

Section: Resultsmentioning

confidence: 93%

“…Two typical emission bands were observed at around 449 and 530 nm, in which the high‐lying emission band comes from the fluorene‐based backbone, and the low‐lying emission band is attributed to excimer emission of these PF derivatives 4. As this kind of PF derivatives contains the oxadiazole unit with an accepting electron effect and carbazole unit with a donating electron effect, there is a donor–acceptor effect in them, the PF derivatives are available to exhibit intense excimer emission 24, 25. In addition, the P 2 , P 3, and P 4 presented much stronger excimer emission than the P 1 under photoexcitation.…”

Section: Resultsmentioning

confidence: 99%

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Improving optoelectronic properties of the 2,7‐polyfluorene derivatives with carbazole and oxadiazole pendants by incorporating the blue‐emitting iridium complex pendants in C‐9 position of fluorine unit

Tan

et al. 2011

J. Polym. Sci. A Polym. Chem.

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To study the influence of a blue‐emitting iridium complex pendant on the optoelectronic properties of its 2,7‐polyfluorene (PF) derivatives with the carbazole and oxadiazole pendants, a class of 2,7‐PF derivatives containing carbazole, oxadiazole, and/without the cyclometalated iridium complex pendants in the C‐9 positions of fluorene unit were synthesized. Their thermal, photophysical, electrochemical, and electroluminescent (EL) properties were investigated. Among these 2,7‐PF derivatives (P1–P4), P2 and P3 exhibited higher photoluminescence efficiency in dichloromethane and better EL properties in the single‐emissive‐layer polymer light‐emitting devices. The highest brightness of 3888 cd/m2 and the maximum current efficiency of 2.9 cd/A were obtained in the P2‐ and P3‐based devices, respectively. The maximum brightness and efficiency levels were 1.7 and 2.1 times, respectively, higher than the corresponding levels from the parent 2,7‐PF derivative (P1)‐based devices. Our work indicated that EL properties of 2,7‐PF derivatives can be improved by introducing the blue‐emitting iridium complex into the alkyl side chain of fluorine unit as pendant. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Improving optoelectronic properties of the 2,7‐polyfluorene derivatives with carbazole and oxadiazole pendants by incorporating the blue‐emitting iridium complex pendants in C‐9 position of fluorine unit

Tan

et al. 2011

J. Polym. Sci. A Polym. Chem.

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“…6 and 7). 50–61 The color of the emission can be fine‐tuned by adjusting the composition of the RGB units and controlling partial energy transfer to green‐ or red‐emissive units in the polymer chain. This strategy has several advantages such as color durability at various driving voltages, easy device fabrication, and low‐cost mass production for large‐panel displays.…”

Section: Polyfluorenesmentioning

confidence: 99%

Solar‐Energy Production and Energy‐Efficient Lighting: Photovoltaic Devices and White‐Light‐Emitting Diodes Using Poly(2,7‐fluorene), Poly(2,7‐carbazole), and Poly(2,7‐dibenzosilole) Derivatives

2010

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World energy needs grow each year. To address global warming and climate changes the search for renewable energy sources with limited greenhouse gas emissions and the development of energy-efficient lighting devices are underway. This Review reports recent progress made in the synthesis and characterization of conjugated polymers based on bridged phenylenes, namely, poly(2,7-fluorene)s, poly(2,7-carbazole)s, and poly(2,7-dibenzosilole)s, for applications in solar cells and white-light-emitting diodes. The main strategies and remaining challenges in the development of reliable and low-cost renewable sources of energy and energy-saving lighting devices are discussed.

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“…One has developed multilayer systems by stacking several layers from three primary color components of red (R), green (G), and blue (B), or simply by using two complementary colors [3][4]. One of the disadvantages of these types of devices is that it is difficult to control the doping level of the long-wavelength light-emitting materials to obtain balanced white-light emission [5]. For the multilayer systems, however, it is difficult to fabricate a well-defined multilayered structure because of the intermixing between the polymer layers.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Water Soluble Conjugated Polymers for WOLED

Song

Kim

Suh

et al. 2012

Molecular Crystals and Liquid Crystals

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Recently, the novel organic materials for white OLEDs have been researched, but it is not easy to apply polymers to WPLEDs. However, because water soluble conjugated polymers can be spin-coated on organic soluble conjugated polymers, when organic soluble blue and red emission polymers, and water soluble green emission polymer were used as multi-layer device, WPLEDs can be produce by the total color of self emission at multi-layer. Water soluble anionic poly (9,9-bis(4 -sulfonatobutyl)fluoreneco-alt-1,4-phenylene) (anion-PF(Na + )) was synthesized, and we investigated the white color emission by multi-layer of this class of anionic conjugated polyelectrolytes and organic conjugated polymers (MEH-PPV) using the following device structure: ITO/PEDOT:PSS/anion-PF(Na + )/MEH-PPV/Al, because anionic PFP can get the selfblue emission and green emission by aggregation effect in film condition. Finally, the color of devices made using different device structure of ITO/PEDOT:PSS/MEH-PPV/anion-PF(Na + )/Al was compared, and this device can get the blue and red emission because the green emission of anionic PFP was absorbed in MEH-PPV.

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Synthesis and properties of polyfluorene, containing oxadiazole and carbazole units as pendants for white light-emitting diodes

Cited by 11 publications

References 41 publications

Improving optoelectronic properties of the 2,7‐polyfluorene derivatives with carbazole and oxadiazole pendants by incorporating the blue‐emitting iridium complex pendants in C‐9 position of fluorine unit

Improving optoelectronic properties of the 2,7‐polyfluorene derivatives with carbazole and oxadiazole pendants by incorporating the blue‐emitting iridium complex pendants in C‐9 position of fluorine unit

Solar‐Energy Production and Energy‐Efficient Lighting: Photovoltaic Devices and White‐Light‐Emitting Diodes Using Poly(2,7‐fluorene), Poly(2,7‐carbazole), and Poly(2,7‐dibenzosilole) Derivatives

Fabrication of Water Soluble Conjugated Polymers for WOLED

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