Photochemical switching in conductive Langmuir-Blodgett films

Tachibana, Hiroaki; Nakamura, Takayoshi; Matsumoto, Mutsuyoshi; Komizu, Hideo; Manda, Eiichiro; Niino, Hiroyuki; Yabe, Akira; Kawabata, Yasujiro

doi:10.1021/ja00190a061

Cited by 148 publications

(51 citation statements)

References 3 publications

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“…Utilization of photochromic compounds as switching elements in electronic devices is a relatively new field. Early experiments by Tachibana et al in the late 1980s/early 1990s demonstrated that azobenzene molecules incorporated into multilayer Langmuir‐Blodgett films could induce reversible changes in lateral (i.e., parallel to the substrate in a 2‐probe setup) conductivity due to optically toggling between the cis and trans isomer, which was confirmed by simultaneously monitoring the absorbance spectra; however, in these examples, the signal began to immediately change once the light was removed, highlighting the thermal instability (i.e., volatility) of the azobenzene chromophores 31, 32. Years later, in 2001, Tsujioka et al integrated a triphenylamine‐functionalized DTE molecule (i.e., R=R′=triphenylamine in Figure 1a) into a vacuum‐evaporated bipolar device architecture, where the DTE acted as a switchable barrier to photogenerated holes from a phthalocyanine photosensitizer 33.…”

Section: Photochromics In Electrically‐addressed Organic Memorymentioning

confidence: 87%

Photochromic Transduction Layers in Organic Memory Elements

et al. 2012

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Photochromic molecules provide an intriguing and relatively untapped alternative to traditional materials utilized in organic memory devices. Here, we review recent progress in the implementation of photochromic molecules in electrically-addressed organic memory devices. Recent results for a lightemitting photochromic organic diode are highlighted in the context of multifunctional devices with the ability to simultaneously operate as multilevel memory, signage and display elements. Furthermore, a set of design rules for successful implementation of photochromic compounds in organic memory devices are suggested.

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Section: Photochromics In Electrically‐addressed Organic Memorymentioning

confidence: 87%

Photochromic Transduction Layers in Organic Memory Elements

et al. 2012

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“…photon mode optical memories, 1,2 information storage, 3 optical switching, 4 and nonlinear optics. photon mode optical memories, 1,2 information storage, 3 optical switching, 4 and nonlinear optics.…”

Section: Introductionmentioning

confidence: 99%

Analyses of the Diffraction Efficiencies, Birefringence, and Surface Relief Gratings on Azobenzene-Containing Polymer Films

1998

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Dynamical experimental studies on the diffraction efficiencies and the formation of birefringence grating and surface relief grating on doped and/or covalently bonded azobenzene derivatives containing polymer films were carried out using laser beams with different polarizations. From polarization analyses of the first-order ((1) diffracted beams, the contributions to the diffraction efficiency are separated into an anisotropic (or birefringence) part and a surface relief part. During the growth of the gratings the dynamical responses of both contributions appear to be quite distinct, and estimates of the time variations of the anisotropic phase shift, ∆ , due to the induced birefringence and of the surface relief height, 2∆d, due to the polymer mass transport are obtained. Calculations and simulations of the theoretical expressions allow us to confirm the experimental findings and to reproduce all the observed polarized first-order diffraction curves with good agreement, even when the surface relief is important in the covalently bonded azobenzene polymer films. In these functionalized systems we thus conclude that very efficient permanent surface relief gratings are formed using right-circular and left-circular interfering laser beams.

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“…The use of photochromic molecules in electronic devices dates back to the late 1980s when Tachibana et al the integration of AZO derivatives in multilayered Langmuir-Blodgett structures could offer tunable bistable conductivity under light irradiation [186,187]. Unfortunately, this approach revealed a noticeable thermal instability of the light-responsive compounds, which would lead to undesired changes in the device output.…”

Section: The Multilayer Approachmentioning

confidence: 99%

Hybrid Organic/Photochromic Approaches to Generate Multifunctional Materials, Interfaces, and Devices

Orgiu

Samorı́

2016

Photochromic Materials: Preparation, Properties and Applications

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Silicon industry's greatest strength has always relied on its ability to downscale device dimensions and generate low-cost functions regardless of the relatively high cost per area. Conversely, "van der Waals solids" relying on weak interactions such as organic semiconductors (OSs) have always been thought of complementing this requirement for low-cost production as well as large-area applications by virtue of their characteristic chemical versatility and easy processability. Hence, OSs hold a great potential for the integration in the everyday flexible electronics [1-22] as they feature a number of fundamental properties such as light emission , charge transport , and photovoltaic response .So far, synthetic pathways and processing of organic semiconductors have greatly improved and generated a variety of possible candidate molecules/ processes that are mature enough to meet the initially envisaged applications [97][98][99][100][101][102][103][104][105][106][107][108][109][110][111][112].Nevertheless, the initial desire for reducing the device size is ultimately getting to an end for the Si-based electronics because of the limitations coming from the photolithographic steps involved in the production process of the devices. In this regard, organic and polymer electronics, that is, the electronics based on organic and polymeric semiconductors, cannot complement its inorganic counterpart and the relentless need of miniaturization unless new challenging avenues are pursued.A new strategy can be envisaged in which molecular functions are integrated into organic semiconductors via a controlled combination with an additional molecular component featuring supplementary functions. This is the case of photochromic systems [113][114][115][116][117][118] that are small organic molecules capable of undergoing reversible isomerization upon light irradiation at definite wavelengths between (at least) two (meta)stable states exhibiting markedly different properties at the molecule level. In these molecular switches, the specific isomeric state is selected upon exposure to a light stimulus with a proper wavelength. The most common families of photochromic molecules, depicted in Figure 7.1, Photochromic Materials: Preparation, Properties and Applications, First Edition. Edited by He Tian and Junji Zhang.

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Photochemical switching in conductive Langmuir-Blodgett films

Cited by 148 publications

References 3 publications

Photochromic Transduction Layers in Organic Memory Elements

Photochromic Transduction Layers in Organic Memory Elements

Analyses of the Diffraction Efficiencies, Birefringence, and Surface Relief Gratings on Azobenzene-Containing Polymer Films

Hybrid Organic/Photochromic Approaches to Generate Multifunctional Materials, Interfaces, and Devices

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