Photoconductivity of liquid crystalline derivatives of pyrene and carbazole

Sienkowska, Monika J.; Monobe, Hirosato; Kaszyński, Piotr; Shimizu, Yo

doi:10.1039/b612253a

Cited by 65 publications

(59 citation statements)

References 56 publications

(64 reference statements)

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“…Shimizu and co-workers reported ambipolar charge transport in the Col h phase of a pyrene derivative 33 ( Fig. 7.12) with charge mobilities on the order of 10 −3 cm 2 V −1 s −1 [90]. Interestingly, when the Col h phase of 33 was super cooled to room temperature, a rigid glassy state was formed (with structural features of the preceding Col h phase) without disrupting the charge transport.…”

Section: N-type Discotic Moleculesmentioning

confidence: 91%

“…However, majority of the DLCs discussed so far (except for some perylene derivatives) are only weakly fluorescent in their mesophases. Recently, pyrenebased DLCs have been synthesized in order to induce strong fluorescence in the columnar mesophase [89,90]. Shimizu and co-workers reported ambipolar charge transport in the Col h phase of a pyrene derivative 33 ( Fig.…”

Section: N-type Discotic Moleculesmentioning

confidence: 99%

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Self-assembled 1D Semiconductors: Liquid Crystalline Columnar Phase

Mathews

Achalkumar

2015

Anisotropic Nanomaterials

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Organic semiconducting materials have emerged as potential alternative to inorganic silicon based semiconductors for the production of low-cost, flexible and light weight plastic electronic devices. When compared with crystalline and polymeric structures, liquid crystalline (LC) ordering in organic semiconductors favors their self-assembly into large area monodomain thin-film structures with carrier mobilities in the range from 10

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Section: N-type Discotic Moleculesmentioning

confidence: 91%

Section: N-type Discotic Moleculesmentioning

confidence: 99%

Self-assembled 1D Semiconductors: Liquid Crystalline Columnar Phase

Mathews

Achalkumar

2015

Anisotropic Nanomaterials

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“…However, the majority of the DLCs discussed so far (except for some perylene derivatives) are only weakly fluorescent in their mesophases. Recently, pyrene-based DLCs have been synthesized in order to induce strong fluorescence in the columnar mesophase [85,86]. Shimizu and coworkers reported ambipolar charge transport in the Col h phase of a pyrene derivative 27 (Fig.…”

Section: Discotic Liquid Crystals With High Charge-carrier Mobilitymentioning

confidence: 99%

“…Shimizu and coworkers reported ambipolar charge transport in the Col h phase of a pyrene derivative 27 (Fig. 4-14) with charge mobilities on the order of 10 −3 cm 2 V −1 s −1 [86]. Interestingly, when the Col h phase of 27 was supercooled to room temperature, a rigid glassy state was formed (with structural features of the preceding Col h phase) without disrupting the charge transport.…”

Section: Discotic Liquid Crystals With High Charge-carrier Mobilitymentioning

confidence: 99%

Self‐Organized Discotic Liquid Crystals as Novel Organic Semiconductors

Mathews¹,

Li²

2011

Self‐Organized Organic Semiconductors

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Organic semiconductors are being intensely investigated and incorporated in device applications such as thin-film transistors, light-emitting diodes, solar cells, and sensors [1,2]. Organic molecules offer the advantage of low-cost synthesis and easy manufacture of large-area thin films by solution processing for the fabrication of a new generation of low-cost, lightweight, and flexible devices that would be inaccessible by conventional methods using inorganic semiconducting materials. The efficiency of these devices is directly related to the mobility of the charges achievable in the conducting layer fabricated by solution-processing techniques such as spin-coating, casting, or printing at ambient conditions exploitable on an industrial scale [3]. A number of different molecular and structural features (chemical purity, solubility, degree of crystallinity, energy band gap, absorption, emission, charge generation, and transport, etc.) have to be combined for optimizing device performance. On the basis of morphology of the materials in the active layers, they can be broadly classified into crystalline, amorphous, and liquid crystalline semiconductors. The highest charge-carrier mobilities (>2 cm 2 V −1 s −1 ) in organic systems have been measured in organic single crystals of pentacene and rubrene [4,5]. However, it is difficult to grow single-crystalline thin films. Charge mobilities in the polycrystalline films of polymeric semiconducting materials such as oligothiophenes, poly(phenylenevinylene), poly(thiophene), and poly(fluorine) compounds have reached values exceeding that of amorphous silicon (>1.0 cm 2 V −1 s −1 ) [6,7]. Thermal sublimation in vacuum is a common method for depositing polymeric

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“…Substituting the hydrogen atom on nitrogen atom with alkyl chains, such as 2-ethylhexyl bromide and octylbromide, can increase the solubility of carbazole derivatives [4,11]. Therefore, the carbazole group has been commonly used as a functional building block in the fabrication of organic photoconductors, non-linear optical devices and OLEDs [12][13][14][15]. On the other hand, 8-hydroxyquinoline metal chelates are presently considered as one of the most reliable electro-transporting and emitting materials applied in molecularbased OLEDs for their thermal stability, high fluorescence, and excellent electron-transporting mobility [16][17][18].…”

Section: Introductionmentioning

confidence: 99%