Theoretical Investigation on the One‐ and Two‐photon Absorption Properties of Porphyrin‐thiophene Chromophores

Li, Wenchao; Feng, Jing; Ren, Ai‐Min; Zhang, Xiang-Biao; Sun, Chia‐Chung

doi:10.1002/cjoc.200990212

Cited by 7 publications

(8 citation statements)

References 39 publications

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“…Besides the oligothiophenes discussed above, self-assembly of p-conjugated oligo(p-phenylenevinylene) (OPV) dimers (10), tetramers (11) and hexamers (12) has also been investigated thoroughly. 24 The structures of oligo(p-phenylenevinylene) (OPV) derivatives are shown in Scheme 4.…”

Section: Assembly Of Conjugated Oligomers 21 Effect Of the Backbone S...mentioning

confidence: 99%

“…[1][2][3][4] Currently, thiophene-containing oligomers and polymers are receiving considerable attention due to their applications in electronic and optical devices, for example, field-effect transistors (FETs), 5 organic light-emitting diodes (OLEDs), 6,7 molecular rectifiers, 8 organic thin film transistors 9,10 and other optical applications. 11 Assembling structures of organic semiconductors are of essential importance to these devices where they are used as active layers. [12][13][14] One of the main technological attractions for such devices based on organic materials is that nearly all the functional layers can be deposited and patterned at low/room temperature by a combination of low-cost solution-processing and direct-write printing, which makes them ideally suited for the realization of low-cost, large-area electronic devices on flexible substrates.…”

Section: Introductionmentioning

confidence: 99%

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Self-assembly of conjugated oligomers and polymers at the interface: structure and properties

Yang

Lei

2012

Nanoscale

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In this review, we give a brief account on the recent scanning tunneling microscopy investigation of interfacial structures and properties of π-conjugated semiconducting oligomers and polymers, either at the solid-air (including solid-vacuum) or at the solid-liquid interface. The structural aspects of the self-assembly of both oligomers and polymers are highlighted. Conjugated oligomers can form well ordered supramolecular assemblies either at the air-solid or liquid-solid interface, thanks to the relatively high mobility and structural uniformity in comparison with polymers. The backbone structure, substitution of side chains and functional groups can affect the assembling behavior significantly, which offers the opportunity to tune the supramolecular structure of these conjugated oligomers at the interface. For conjugated polymers, the large molecular weight limits the mobility on the surface and the distribution in size also prevents the formation of long range ordered supramolecular assembly. The submolecular resolution obtained on the assembling monolayers enables a detailed investigation of the chain folding at the interface, both the structural details and the effect on electronic properties. Besides the ability in studying the assembling structures at the interfaces, STM also provides a reasonable way to evaluate the distribution of the molecular weight of conjugated polymers by statistic of the contour length of the adsorbed polymer chains. Both conjugated oligomers and polymers can form composite assemblies with other materials. The ordered assembly of oligomers can act as a template to controllably disperse other molecules such as coronene or fullerene. These investigations open a new avenue to fine tune the assembling structure at the interface and in turn the properties of the composite materials. To summarize scanning tunneling microscopy has demonstrated its surprising ability in the investigation of the assembling structures and properties of conjugated oligomers and polymers. The information obtained could benefit the understanding of the elements affecting the film morphology and helps the optimization of device performance.

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Section: Assembly Of Conjugated Oligomers 21 Effect Of the Backbone S...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-assembly of conjugated oligomers and polymers at the interface: structure and properties

Yang

Lei

2012

Nanoscale

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“…It is reported [15] that a thin film of CdSe nanocrystals embedded in PMMA exposed to laser radiation showed a strong TPA over the bulk at 800 nm, occurring due to the confinement of system and the study demonstrated the importance of reduction of scattering losses in a nonlinear medium used for the generation of squeezed light. Recently, a study of TPA in nanocrystallites [16], organic molecules [17] and quantum dots [18] has attracted attention of many researchers.…”

Section: A H C +mentioning

confidence: 99%

Generation of Nonclassical Light by Unsaturated Two-Photon Absorption

Latha¹,

Sripriya²,

Ramesh³

2017

OPJ

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In this paper, we investigate the distribution statistics of photons in a single mode radiation field subjected to two-photon absorption (TPA) and the factors that contribute to squeezing and antibunching of photons, leading to the generation of nonclassical light. TPA is a nonlinear optical phenomenon in which the atoms interact with the light field by absorbing two photons simultaneously. The motivation to study TPA is the recent intense activity on nanocrystallites/quantum dots. Further, it is the only nonlinear optical phenomenon that can be analytically studied. The simultaneous occurrence of squeezing and antibunching is studied with small initial photon numbers by solving the master equation for TPA of a single mode radiation directly by numerical integration, without going through analytical procedure. The results are compared with those of analytical/numerical procedures available. Further, the discussion on the parameters of squeezing and antibunching for short-time (ST) as well as long-time is done comprehensively in the present work by taking up the ST approximation and summation of ST (SST) procedure along with the exact numerical method.

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“…20 The p-n co-oligomer and copolymer based electron-rich thiophene unit as donor have been studied showing unique optoelectronic properties with low bandgap and the preferred packing configuration. 21,22 Furthermore, their energy levels (HOMO/LUMO) can be effectively modulated by changing the number and position of the electron-rich and electron-deficient units of p-n diblock polymers.…”

Section: Introductionmentioning

confidence: 99%

Molecular Packing in Self‐Assembled p‐n and n‐p‐n Heterostructure Co‐oligomers

Wan

et al. 2010

Chin. J. Chem.

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The molecular packing structure in the self-assembled p-n and n-p-n heterostructure oligomers (OT 2 O and T 2 O 2 ) was investigated. The macroscopic properties of the two oligomers were systemically investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and X-ray diffraction (XRD), which revealed that the 3D (three-dimensional) assemblies of the two oligomers exhibited obvious differences. The two-dimensional assemblies (2D) of them were identified by scanning tunneling microscopy (STM) on a highly oriented poyrolytic graphite (HOPG) surface. Well-ordered monolayer assembly structures were fabricated by symmetric molecules (OT 2 Os), while the ordered dormain of asymmetric molecule (T 2 O 2 s) could not be clearly resolved. This system, as an excellent example, may provide guidance for the design of the novel p-n heterostructure oligomer and polymer.

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Theoretical Investigation on the One‐ and Two‐photon Absorption Properties of Porphyrin‐thiophene Chromophores

Cited by 7 publications

References 39 publications

Self-assembly of conjugated oligomers and polymers at the interface: structure and properties

Self-assembly of conjugated oligomers and polymers at the interface: structure and properties

Generation of Nonclassical Light by Unsaturated Two-Photon Absorption

Molecular Packing in Self‐Assembled p‐n and n‐p‐n Heterostructure Co‐oligomers

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