Polyfluorenes with Dendron Side Chains as the Active Materials for Polymer Light-Emitting Devices

Pogantsch, Alexander; Wenzl, Franz P.; List, Emil; Leising, G.; Grimsdale, Andrew C.; Müllen, Kläus

doi:10.1002/1521-4095(20020805)14:15<1061::aid-adma1061>3.0.co;2-6

Cited by 199 publications

(137 citation statements)

References 16 publications

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“…It should be noted that a comparable level of delayed aggregate emission in the two materials is compatible with the observation that the charge-transporting properties of PF are not dramatically modified upon dendronization. [3,25] As chain-to-chain transport is expected to be most efficient at sites of aggregation, which exist in both materials, it is not surprising that the insulating dendrons do not result in the bulk film becoming more insulating. By contrast, a strong dependence of charge transport on dendronization has been observed in a family of macromolecular dendrimers.…”

Section: Resultsmentioning

confidence: 99%

Influence of Dendronization on Spectral Diffusion and Aggregation in Conjugated Polymers

Lupton¹,

Schouwink

Keivanidis

et al. 2003

Adv Funct Materials

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Dendronization has previously been suggested as a means of controlling the level of intermolecular interactions in macromolecular and polymeric compounds. We therefore studied the spectral relaxation dynamics of dendronized and non‐dendronized polyfluorenes at different temperatures. Dendronization strongly affects inhomogeneous spectral broadening, resulting in a blue‐shift and broadening of the otherwise narrow vibronic progression of polyfluorene at low temperature. Using gated spectroscopy we are able to identify emissive keto defects on isolated chains of both dendronized and non‐dendronized polymers, along with a strong aggregation band in the solid state. Surprisingly, the emission from chemical and structural defects is found to be stronger in the case of the dendronized material. The observation of aggregate emission in dendronized polyfluorenes suggests that aggregation in these materials does not occur through linear π‐stacking, but rather through electronic interactions at point contacts between chains introduced by structural kinks along the backbone.

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Section: Resultsmentioning

confidence: 99%

Influence of Dendronization on Spectral Diffusion and Aggregation in Conjugated Polymers

Lupton¹,

Schouwink

Keivanidis

et al. 2003

Adv Funct Materials

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“…It has been demonstrated that adding dendritic bulky moieties can effectively suppress the formation of aggregation (Ego et al, 2002;Marsitzky et al, 2001) and reduce self-quenching of luminescence duo to intermolecular interactions. (Pogantsch et al, 2002) In addition, a good film-forming ability, a good morphological stability and a high thermal stability also are crucial to the practical application of PLED. (Smith et al, 1998;Fenter et al, 1997) They can be improved by increasing the molecular weight of the EL polymer materials or introducing, compounding the thermostable groups or molecules into the EL polymer materials.…”

Section: Introductionmentioning

confidence: 99%

Ladder Polysiloxanes for Optoelectronic Applications

Ren¹,

Yan²,

Zhang³

2011

Optoelectronics - Materials and Techniques

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“…This unique molecular architecture therefore allows independent optimization of the optoelectronic and processing properties. [5][6][7] Since the first report on the use of triplet emitters in OLEDs by Forrest and Thompson, [8] electrophosphorescent devices have attracted a great deal of interest, in which metal-organic complexes of Ru(II), Os(II), or Ir(III) are doped into charge transporting host materials as the emitting centers.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Phosphorescent Iridium Containing Dendrimers for Potential Applications in Organic Light‐Emitting Diodes

Liu

Lü

Ding

et al. 2008

Macro Chemistry & Physics

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Three phosphorescent dendrimers (IrC1, IrC3, and IrF2) with an iridium complex core and oligocarbazole or oligofluorene substituted ligands were synthesized and characterized. The structures of the oligocarbazole were designed to maintain high triplet energy of the ligands so that phosphorescence quenching in the resulting dendrimers can be prevented, while the oligofluorene in IrF2 resulted in undesired phosphorescence quenching. Best performance was obtained from an IrC3 based electrophosphorescent light‐emitting device with a maximum luminance of 13 060 cd · m−2 at a driving voltage of 11.5 V and a peak current‐efficiency of 4.3 cd · A−1 at a luminance of 3 400 cd · m−2, owing to its high PL efficiency, and efficient energy transfer between the iridium complex core and the ligands.magnified image

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Polyfluorenes with Dendron Side Chains as the Active Materials for Polymer Light-Emitting Devices

Cited by 199 publications

References 16 publications

Influence of Dendronization on Spectral Diffusion and Aggregation in Conjugated Polymers

Influence of Dendronization on Spectral Diffusion and Aggregation in Conjugated Polymers

Ladder Polysiloxanes for Optoelectronic Applications

Design and Synthesis of Phosphorescent Iridium Containing Dendrimers for Potential Applications in Organic Light‐Emitting Diodes

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