Femtosecond Twisting and Coherent Vibrational Motion in the Excited State of Tetraphenylethylene

Lenderink, Egbert; Duppen, Koos; Wiersma, Douwe A.

doi:10.1021/j100022a006

Cited by 75 publications

(65 citation statements)

References 9 publications

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“…[33][34][35] In dilute solution, twisting of the olefinic double bond of the 4-(1,2,2-triphenylvinyl)phenyl group might facilitate approach between the excited and ground states of TPVAn and, thus, the occurrence of efficient internal conversion; this situation is similar to tetraphenylethylene undergoing rapid radiationless decay along the ethylenic torsional coordinate. [36,37] In the solid state, however, the degree of internal conversion was insignificant because the rigid environment inhibited the twisting motion of TPVAn, resulting in the observed enhanced emission.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Highly Efficient Non‐Doped Blue‐Light‐Emitting Diodes Based on an Anthrancene Derivative End‐Capped with Tetraphenylethylene Groups

Shih

Chuang

Chien

et al. 2007

Adv Funct Materials

251

120

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A novel blue‐emitting material, 2‐tert‐butyl‐9,10‐bis[4‐(1,2,2‐triphenylvinyl)phenyl]anthracene (TPVAn), which contains an anthracene core and two tetraphenylethylene end‐capped groups, has been synthesized and characterized. Owing to the presence of its sterically congested terminal groups, TPVAn possesses a high glass transition temperature (155 °C) and is morphologically stable. Organic light‐emitting diodes (OLEDs) utilizing TPVAn as the emitter exhibit bright saturated‐blue emissions (Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of x = 0.14 and y = 0.12) with efficiencies as high as 5.3 % (5.3 cd A–1)—the best performance of non‐doped deep blue‐emitting OLEDs reported to date. In addition, TPVAn doped with an orange fluorophore served as an authentic host for the construction of a white‐light‐emitting device that displayed promising electroluminescent characteristics: the maximum external quantum efficiency reached 4.9 % (13.1 cd A–1) with CIE coordinates located at (0.33, 0.39).

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Section: Thermal Propertiesmentioning

confidence: 99%

Highly Efficient Non‐Doped Blue‐Light‐Emitting Diodes Based on an Anthrancene Derivative End‐Capped with Tetraphenylethylene Groups

Shih

Chuang

Chien

et al. 2007

Adv Funct Materials

251

120

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“…Ref. [2]). This potential can bring the nuclei of the molecule to regions in conformational space where the energy surfaces of ground and excited states come close to each other or even touch.…”

Section: Introductionmentioning

confidence: 99%

Slower processes of the ultrafast photo-isomerization of an azobenzene observed by IR spectroscopy

et al. 2007

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“…One could think that such experiments should be performed for atoms, but how this would be done is not necessarily obvious. Molecules going through conical intersections and other narrow bottlenecks show a remarkable retention of their phases (19,(26)(27)(28)(29)(30). Then the pump (or probe) can also be tailored up to and including interference between the pump (or probe) pulses.…”

Section: Discussionmentioning

confidence: 99%

A molecular logic gate

Kompa

Levine

2001

Proc. Natl. Acad. Sci. U.S.A.

132

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We propose a scheme for molecule-based information processing by combining well-studied spectroscopic techniques and recent results from chemical dynamics. Specifically it is discussed how optical transitions in single molecules can be used to rapidly perform classical (Boolean) logical operations. In the proposed way, a restricted number of states in a single molecule can act as a logical gate equivalent to at least two switches. It is argued that the four-level scheme can also be used to produce gain, because it allows an inversion, and not only a switching ability. The proposed scheme is quantum mechanical in that it takes advantage of the discrete nature of the energy levels but, we here discuss the temporal evolution, with the use of the populations only. On a longer time range we suggest that the same scheme could be extended to perform quantum logic, and a tentative suggestion, based on an available experiment, is discussed. We believe that the pumping can provide a partial proof of principle, although this and similar experiments were not interpreted thus far in our terms. The need for increasing miniaturization of logical circuits is foreseen to soon reach the physical limit of MOSFET (Metal Oxide Semiconductor Field Effect) Transistors. There is therefore a worldwide search for alternatives. Single-molecule-based switches (1, 2) rectifiers (3, 4), and wires (5) Other important recent work in this direction is reviewed in refs. 6 and 7. A different route, which has been studied for some time (8-10), is to combine chemical inputs with optical outputs. These are typically solution phase experiments, which have used to advantage the progress in supramolecular chemistry for the construction of molecular machines (11,12).We discuss a molecule-based scheme for logical operations, which is different in its features. One merit of our scheme is that it involves well-established and well-characterized photophysicochemical processes. This enables us to know that we could anticipate eventually an ultrafast processing and can expect a rather fast (picosecond time scale) response, even in preliminary studies. A point of chemical importance is that the scheme operates with the kind of molecules for which one has a great scope for organic synthesis so as to tailor the molecule to specific responses, both optical and kinetic. An important limitation, common to our scheme and to other proposals for computing with molecules (7), is the challenge of connecting the molecules. This paper provides an introduction to our proposal for molecular information processing, stressing the fundamental issues and avoiding mathematical formalism.In the background to our discussion is the observation by Shannon (13) that there is an analogy between switches and Boolean logic operations. In fact, Shannon's proposal predates the invention of transistors and was first applied to electromechanical switches. The point is that it takes at least two switches to represent a logic operation. Fig. 1 shows a schematic representation of circuits tha...

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Femtosecond Twisting and Coherent Vibrational Motion in the Excited State of Tetraphenylethylene

Cited by 75 publications

References 9 publications

Highly Efficient Non‐Doped Blue‐Light‐Emitting Diodes Based on an Anthrancene Derivative End‐Capped with Tetraphenylethylene Groups

Highly Efficient Non‐Doped Blue‐Light‐Emitting Diodes Based on an Anthrancene Derivative End‐Capped with Tetraphenylethylene Groups

Slower processes of the ultrafast photo-isomerization of an azobenzene observed by IR spectroscopy

A molecular logic gate

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