Enhancement of light emitting diodes based on self-assembled heterostructures of poly(<i>p</i>-phenylene vinylene)

Onitsuka, O.; Fou, A. C.; Ferreira, Marystela; Hsieh, B.J.; Rubner, Michael F.

doi:10.1063/1.363369

Cited by 144 publications

(111 citation statements)

References 25 publications

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“…Ionically self-assembled monolayer ͑ISAM͒ films are a recently developed, [10][11][12][13][14][15][16][17][18] revolutionary class of materials that allows detailed structural and thickness control at the molecular level combined with ease of manufacturing and low cost. The ISAM method involves the alternate dipping of a charged substrate into an aqueous solution of a cation followed by dipping in an aqueous solution of an anion at room temperature.…”

mentioning

confidence: 99%

Thickness dependence of second-harmonic generation in thin films fabricated from ionically self-assembled monolayers

Heflin

Figura

Marciu

et al. 1999

Applied Physics Letters

105

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mentioning

confidence: 99%

Thickness dependence of second-harmonic generation in thin films fabricated from ionically self-assembled monolayers

Heflin

Figura

Marciu

et al. 1999

Applied Physics Letters

105

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“…This was well illustrated by Rubner and collaborators 43,44 , which showed that the light output of PPV SA lms could be increased by identifying optimized supramolecular architectures that contained PPV SPS polystyrene sulfonic acid and PPV PMA polymethacrylic acid layers. The output could be further enhanced if passive l a yers of SPS PAH polyallylamine were deposited adjacent to the aluminum electrode.…”

Section: Iii2 Electroluminescent Devicesmentioning

confidence: 75%

Exploiting the electrical properties of thin films of semiconducting polymers

Faria¹,

Oliveira²

1999

Braz. J. Phys.

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A brief review is provided of the ways electrical properties of semiconducting polymers can be exploited. Emphasis is given to the analysis of electrical conductivity data, in particular to the importance of interchain processes that must be considered along with intrachain processes for bulk conductivity. Among the large variety of possible applications of thin lms of semiconducting polymers, the focus is placed on recent breakthroughs in producing diodes, eld e ect transistors and electroluminescent devices out of these materials. The fabrication of ultrathin lms from semiconducting polymers, using the Langmuir-Blodgett and the self-assembly techniques, is discussed to illustrate the importance of processibility issues for any real application including these polymers. I IntroductionDue to their remarkable intrinsic electrical insulating characteristics, organic polymeric materials have been for a long time the subject of extensive dielectric and charge storage studies 1-3 . Electrical breakdown, charging-discharging mechanisms, thermoelectric and radiation e ects, and dielectric relaxation processes have been investigated from both experimental and theoretical points of view. Insulating polymers are now widely used as insulation in power cables in energy distribution networks, and in di erent t ypes of high accuracy equipment. The contribution of Prof. B. Gross in this area started at the early 70s, when he introduced uorinated polymers as extremely good electrets owing to their large charge storage capacity and remarkable mechanical properties 4 . The combination of such properties allowed these polymers to be applied as active membranes in electroacoustic devices 5 . Later on the family of polyvinylidene uoride PVDF found several applications as piezoelectric and pyroelectric devices, deriving from their ferroelectric activity 6 .Until the early 1980s, most studies and applications using electrical properties of polymeric materials only exploited their insulating and charge storage capabilities. A new turn, both in science and technology, t o o k place in the 1980s with the advent of the conducting and semiconducting polymers 7 , with polyacetylene being their foremost representative in the initial studies 8 . Several possible applications have since been suggested and actually demonstrated in which the polymer is employed not only as a passive, insulating element, but also with an active role, as in microelectronic device components 9 .One major di culty, which i s e v en now a stumbling block for the widespread use of conducting polymers, is fabrication in the required form and shape. The rst conducting polymers produced were almost invariably insoluble and infusible. Over the years, new approaches have been implemented by v arious research groups in order to overcome the fabrication di culty. Such approaches stem from synthetic chemistry methods 10 with incorporation of side groups that make the polymer soluble, new techniques for growing lms electrochemically 11 and the use of functionalized acids to im...

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“…Mais recentemente, Rubner e colaboradores vêm explorando os sistemas contendo PPV 42,43 , que também é eletroluminescente e pode ser usado em diodos emissores de luz (LED). Em princípio, a deposição de PPV não pode ser feita a partir do polímero, uma vez que ele é insolúvel na maioria dos solventes conhecidos.…”

Section: Principais Sistemas Estudados E Suas Propriedadesunclassified

“…Dentre as mais relevantes, citamos aquelas que envolvem a atuação de filmes de polímeros condutores em diodos emissores de luz 42,43,53 e sensores para gases 46,48 , filmes de materiais biológicos como enzimas e outras proteí-nas na produção de biosensores 52 , filmes de polímeros contendo corantes visando a aplicações em ótica não-linear 54 , as quais serão descritas mais detalhadamente a seguir.…”

Section: Aplicações De Filmes Automontadosunclassified

Filmes poliméricos ultrafinos produzidos pela técnica de automontagem: preparação, propriedades e aplicações

Paterno¹,

Mattoso²,

Oliveira³

2001

Quím. Nova

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Recebido em 12/6/00; aceito em 16/8/00 ULTRATHIN POLYMER FILMS PRODUCED BY THE SELF-ASSEMBLY TECHNIQUE: PREPARATION, PROPERTIES AND APPLICATIONS. The self-assembly technique is a powerful tool to fabricate ultrathin films from organic compounds aiming at technological applications in molecular electronics. This relatively new approach allows molecularly flat films to be obtained on a simple and cheap fashion from various types of material, including polyelectrolytes, conducting polymers, dyes and proteins. The resulting multilayer films may be fabricated according to specific requirements since their structural and physical properties may be controlled at the molecular level. In this review we shall comment upon the evolution of preparation methods for ultrathin films, the process of adsorption and their main properties, as well as some examples of technological applications of layer-by-layer or selfassembled films.Keywords: self-assembly; ultrathin films; polyions; layer-by-layer films. Quim. Nova, Vol. 24, No. 2, 228-235, 2001. Revisão INTRODUÇÃOA partir da década de 60, moléculas orgânicas passaram a receber atenção especial, devido à possibilidade de seu emprego em dispositivos eletrônicos e óticos, principalmente após a descoberta de condução elétrica em cristais formados pela combinação de moléculas doadoras e aceitadoras de carga, como o tetratiofulvaleno (TTF) e o tetracianoquinodimetano (TCNQ)1 . O potencial tecnológico de materiais orgânicos foi reconhecido, em função de sua variedade de propriedades elétricas, óti-cas e magnéticas. É provável que num futuro próximo, materiais orgânicos como corantes, polímeros condutores e proteí-nas passem a competir com os materiais inorgânicos no setor eletrônico, principalmente pelo seu baixo custo de produção e/ ou disponibilidade e pela variedade de propriedades/aplicações. Além disso, métodos de processamento e de fabricação de filmes ultrafinos 2 vêm sendo desenvolvidos paralelamente para que as propriedades destes materiais possam vir a ser exploradas futuramente em escala comercial.As possíveis aplicações dos materiais orgânicos incluem óti-ca integrada, sensores, recobrimentos para redução de fricção, agentes de superfície para orientação de camadas e em dispositivos de heterojunções, como diodos emissores de luz 2,3 . O desenvolvimento de técnicas de fabricação de filmes ultrafinos foi impulsionado pela necessidade de se obter estruturas organizadas, com controle de espessura e de propriedades em escala molecular. Os métodos de Langmuir-Blodgett (LB) 4 e de automontagem 5 despontam como os mais promissores neste aspecto, uma vez que permitem "organizar" moléculas individuais em arquiteturas altamente ordenadas 2 , propiciando ainda o planejamento das propriedades finais dos filmes obtidos, por exemplo, através da incorporação de cromóforos apropriados, grupos funcionais, e variação da espessura das camadas. Outro aspecto interessante nesta área científico-tecnológica é a sua interdisciplinaridade, que envolve profissionais das áreas de física, química, bio...

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Enhancement of light emitting diodes based on self-assembled heterostructures of poly(p-phenylene vinylene)

Cited by 144 publications

References 25 publications

Thickness dependence of second-harmonic generation in thin films fabricated from ionically self-assembled monolayers

Thickness dependence of second-harmonic generation in thin films fabricated from ionically self-assembled monolayers

Exploiting the electrical properties of thin films of semiconducting polymers

Filmes poliméricos ultrafinos produzidos pela técnica de automontagem: preparação, propriedades e aplicações

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