Topic
Pentacene
About: Pentacene is a research topic. Over the lifetime, 5051 publications have been published within this topic receiving 161481 citations. The topic is also known as: 2,3:6,7-dibenzanthracene & benzo[b]naphthacene.
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TL;DR: In this article, the first-principles many-body Bethe-Salpeter equation is used to compare the optical properties of two prototype and technological relevant organic molecular crystals: picene and pentacene.
Abstract: By solving the first-principles many-body Bethe-Salpeter equation, we compare the optical properties of two prototype and technological relevant organic molecular crystals: picene and pentacene. Albeit very similar for the structural and electronic properties, picene and pentacene show remarkable differences in their optical spectra. While for pentacene the absorption onset is due to a charge-transfer exciton, in picene it is related to a strongly localized Frenkel exciton. The detailed comparison between the two materials allows us to discuss, on general grounds, how the interplay between the electronic band dispersion and the exchange electron-hole interaction plays a fundamental role in setting the nature of the exciton. It represents a clear example of the relevance of the competition between localization and delocalization in the description of two-particle electronic correlation.
112 citations
TL;DR: In this paper, the structural properties and charge carrier mobility of pentacene doped by 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) and 2,2-(perfluoronaphthalene-2,6)-diylidene) dimalononitrile (F6-TCNNQ) are studied by X-ray diffraction, scanning electron microscopy, field effect transistor measurements, and space charge limited currents
111 citations
TL;DR: The surface free energy of a dielectric has a strong influence on the performance of pentacene thin-film transistors and has been shown to enhance the field effect mobility of transistors as discussed by the authors.
Abstract: The surface free energy of a dielectric has a strong influence on the performance of pentacene thin-film transistors. Research shows that by matching surface free energy in the interface of the dielectric and the orthorhombic thin-film phase of pentacene film, the field-effect mobility of transistors is enhanced reaching above 2.0cm2∕Vs. The authors suggested that a more complete first monolayer of pentacene was formed upon the gate dielectric surface with almost identical surface free energy, benefiting carrier transportation. The research also discusses the mechanism of surface free energy effects on the crystalline size and structural disorder in pentacene film.
111 citations
TL;DR: In this paper, an integrated circuit with an organic light-emitting diode (OLED) and a thin-film transistor (TFT) based on small molecules was fabricated on a glass substrate.
Abstract: Integrated circuits with an organic light-emitting diode (OLED) and a thin-film transistor (TFT) based on small molecules were fabricated on a glass substrate. The field-effect mobility and the current on/off ratio of the integrated TFTs with a pentacene layer deposited at room temperature were 0.12 cm2/V s and higher than 103, respectively. The OLEDs had a multilayer structure containing tris-(8-hydroxyquinoline) aluminum doped with coumarin 6 to obtain high luminance efficiency. The luminance was controlled in the range of up to approximately 1000 by applying the gate voltage of 10 to −10 V. The value of the luminance is sufficient for conventional displays.
111 citations
TL;DR: A series of pentacene derivatives featuring substituted aryl groups at the 6,13 position have been synthesized and characterized in solution and in the solid state, and organic light-emitting diodes based on these composite films as the active emitting layers have been fabricated and characterized as mentioned in this paper.
Abstract: A series of three pentacene derivatives featuring substituted aryl groups at the 6,13-position, namely, 6,13-diphenylpentacene, 6,13-bis(2,6-dimethylphenyl)pentacene, and 6,13-bis(4-tert-butylphenyl)pentacene, have been synthesized and characterized. The optical properties of each compound have been determined in solution and in the solid state. Films containing the pentacene derivatives dispersed in tris(quinolin-8-olato)aluminum(III) (Alq3) emit in the red with small contribution from the Alq3 host, signaling efficient energy transfer from host to guest molecules. The absolute photoluminescence quantum yield (φPL) of composite films is ∼30−32% at optimum dopant concentration. Organic light-emitting diodes based on these composite films as the active emitting layers have been fabricated and characterized. External electroluminescence quantum efficiencies near the theoretical limit have been achieved.
111 citations