Recent Applications of Conjugated Polyelectrolytes in Optoelectronic Devices

Hoven, Corey V.; García, Alberto Luis García; Bazan, Guillermo C.; Nguyen, Thuc‐Quyen

doi:10.1002/adma.200800533

Cited by 367 publications

(349 citation statements)

References 174 publications

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“…The devices showed very short response times (∼10 μs; Figure 2). This is the shortest response time reported for organic light-emitting diodes (OLEDs) with CPE injection layers 8 and is comparable to the response times of OLEDs with metal electrodes. [23][24][25] The short response times strongly indicate that long-range ion motion does not play a major role in the charge injection process.…”

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confidence: 61%

“…[6][7][8][9][10][11][12] A range of CPEs with different counterions (anion/cation) and backbones 13,14 have been synthesized in attempts to understand the role of the ions in the charge injection process. 15,16 The promising electronic properties of CPEs in combination with their solubility in polar solvents offer a unique route to the realization of high-performance polymer light-emitting diodes (PLEDs) without the use of reactive Ca or Ba cathodes.…”

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confidence: 99%

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Conjugated Zwitterionic Polyelectrolyte as the Charge Injection Layer for High-Performance Polymer Light-Emitting Diodes

et al. 2010

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A new zwitterionic conjugated polyelectrolyte without free counterions has been used as an electron injection material in polymer light-emitting diodes. Both the efficiency and maximum brightness were considerably improved in comparison with standard Ca cathode devices. The devices showed very fast response times, indicating that the improved performance is, in addition to hole blocking, due to dipoles at the cathode interface, which facilitate electron injection.

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confidence: 61%

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confidence: 99%

Conjugated Zwitterionic Polyelectrolyte as the Charge Injection Layer for High-Performance Polymer Light-Emitting Diodes

et al. 2010

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“…In the case of inorganic metal/semiconductor contacts , to take into account the interface states, Bardeen proposed a model, where a large density of surface states induces a pining effect of the Fermi level and the presenc e at the interface of a barrier independent of the metal work function. the devices is often modulated by a dipole ( formation at the interface, it is admitted that this difference provides a hole collection barrier in OPV cells [23]. It has been already shown that the presence of such a barrier induces the presence of the kink effect in the J-V characteristics (Figure 1) [24].…”

Section: Discussionmentioning

confidence: 99%

“…Other transition metal oxide (WO 3 , V 2 O 5 , NiO) have been probed as efficient ABL. Although such interface improvement has been often carried out [8,[23][24][25][26], the operation mechanism of these ABL is still in debate. The typical values which characterize the properties of the MoO 3 are: The work function, MoO3 , the top of the valence band, VB, which is the ionisation potential, IP, the bottom of the conduction band, BC, which is the electronic affinity (EA).…”

Section: Discussionmentioning

confidence: 99%

About the transparent electrode of the organic photovoltaic cells

Bérnède

Nguyen

Cattin

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. Electrodes and the nature of their contact with organic materials play a crucial role in the realization of efficient optoelectronic components. Whether the injection (organic light emittin g diodesOLEDs) or collection (organic photovoltaic cells -OPV cells) of carriers, contacts must be as efficient as possible. To do this, it is customary to refer to electrode surface treatment and / or using a buffer layer all things to optimize the contac t. Efficiency of organic photovoltaic cells based on organic electron donor/organic electron acceptor junctions can be strongly improved when the transparent conductive anode is coated with a buffer layer (ABL). We show that an ultra-thin gold (0.5 nm) or a thin molybdenum oxide (3-5 nm) can be used as efficient ABL. However, the effects of these ABL depend on the highest occupied molecular orbital (HOMO) of different electron donors of the OPV cells. The results indicate that, in the case of metal ABL, a good matching between the work function of the anode and the highest occupied molecular orbital of the donor material is the major factor limiting the hole transfer efficiency. Indeed, gold is efficient as ABL only when the HOMO of the organic donor is clos e to its work function Au . MoO 3 has a wider field of application as ABL than gold , The role of the oxide is not so clearly understand than that of Au , different models proposed to interpret the experimental results are discussed.

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“…A romatic conjugated polymers have semi-conducting and luminescent properties, which can be utilized in organic light-emitting diodes, organic field-effect transistors, photovoltaic cells, and chemical biosensors [1][2][3][4][5][6][7][8] . Such conjugated polymers can fluoresce various colours in the visible region through changing the conjugated backbones.…”

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confidence: 99%

Photochemically colour-tuneable white fluorescence illuminants consisting of conjugated polymer nanospheres

Watanabe

Hayasaka

et al. 2014

Nat Commun

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p-Conjugated aromatic polymers have attracted much interest due to their semi-conducting and luminescent properties, and are therefore regarded as promising materials for next-generation optoelectronic devices. Especially, it is considered as one of the indispensable steps for advanced function to control the optoelectronic properties by external stimuli. Herein, we show photochemically fluorescent colour-tuneable systems consisting of photoresponsive conjugated polymer nanospheres. We design and synthesize photoresponsive conjugated polymers with red, green and blue (RGB) fluorescence by introducing photoisomeric dithienylethene moieties in the side chains. A mixture of the red-, green-and blue-fluorescent polymer nanospheres exhibits photoswitchable white fluorescence between emission and quenching by irradiating external lights in both the nanosphere solution and film state. In addition, reversible change in fluorescent colour between white and RGB is also achieved by replacing a photoresponsive polymer with a non-photoresponsive analogue in the mixture. Thus, we successfully demonstrate 'photoresponsive polymer illuminant' systems bearing photochemically colour-tuneable white fluorescence.

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Recent Applications of Conjugated Polyelectrolytes in Optoelectronic Devices

Cited by 367 publications

References 174 publications

Conjugated Zwitterionic Polyelectrolyte as the Charge Injection Layer for High-Performance Polymer Light-Emitting Diodes

Conjugated Zwitterionic Polyelectrolyte as the Charge Injection Layer for High-Performance Polymer Light-Emitting Diodes

About the transparent electrode of the organic photovoltaic cells

Photochemically colour-tuneable white fluorescence illuminants consisting of conjugated polymer nanospheres

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