Published in 12/12/2023 - ISBN: 978-65-272-0088-8

Paper Title
  • Endel Ezequiel Carvalho Costa
  • Marleane Maria Felix de Azevedo
  • Maria Leticia Vega
  • Angel Alberto Hidalgo
Subject area
Dispositivos eletrônicos e ópticos (OLED/OFET/OPVs/etc.)
Publishing Date
Country of Publishing
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Paper Page
Anisotropy, Langmuir-Blodgett Technique, PLEDs
Charge transport in conjugated polymers is a complex phenomenon that involves multiple and complementary mechanisms. These polymers, optically and electronically actives are used in thin films. These films, have in their structures ordered and disordered zones that end up being a limiting factor in the development of good devices. The presence of ordered and disordered regions acts as light suppressors [1] centers and/or traps. In this context, the Langmuir-Blodgett technique becomes an advantageous option, as it allows the deposition of thin films controlling molecular organization and thickness. In addition, the technique uses little amounts of material. Using this technique, it is possible to obtain an optimization of the organic/inorganic interface, improving charge injection, reducing traps and improving charge transport, generally enhancing devices performance [2,3]. The resulting anisotropy from the ordering induced by the technique allows better characterization of the intrachain and interchain charge transport. Furthermore, alignment of transition dipole moments will result in polarized absorption and change in emission properties. When anisotropic films are used as active layer, we observe that only a fraction of the light (polarized parallel to the polymer transition dipole moment) will be absorbed and the transmitted light portion can be used for other purposes such as absorption by a second active layer [4]. Light polarization is an important aspect of new display technologies, as not only the absorption but also the generation of polarized light and the interaction between light absorption and the emission provides key aspects for design technologies such as thin films of adjustable colors, high-efficiency optical communication systems or LCD monitors based on polarized PLED backlights [5]. In this work, we intend to produce Polymeric Light Emitting Diodes (PLED’s) using Langmuir-Blodgett films to study the correlation between the ordering of the films and device performance. Acknowledgements: INEO, CNPq, CAPES, UFPI References: [1] OSAKA, Itaru; TAKIMIYA, Kazuo. Backbone orientation in semiconducting polymers. Polymer, v. 59, p. A1-A15, 2015. [2] OLIVATI, C. A.; GONÇALVES, V. C.; BALOGH, Débora Terezia. Optically anisotropic and photoconducting Langmuir–Blodgett films of neat poly (3-hexylthiophene). Thin Solid Films, v. 520, n. 6, p. 2208-2210, 2012. [3] WATANABE, Shun-ichiro et al. Charge transport anisotropy due to interfacial molecular orientation in polymeric transistors with controlled in-plane chain orientation. Applied Physics Express, v. 5, n. 2, p. 021602, 2012. [4] BOLOGNESI, Alberto et al. Polarized electroluminescence in double-layer light-emitting diodes with perpendicularly oriented polymers. Advanced Materials, v. 13, n. 14, p. 1072-1075, 2001. [5] VOHRA, Varun; ANZAI, Takuya. Molecular orientation of conjugated polymer chains in nanostructures and thin films: Review of processes and application to optoelectronics. Journal of Nanomaterials, v. 2017, 2017.
Title of the Event
Workshop do INEO 2023
City of the Event
Nazaré Paulista
Title of the Proceedings of the event
Anais do Workshop INEO 2023
Name of the Publisher
Means of Dissemination
Meio Digital
LinkGet DOI

How to cite

COSTA, Endel Ezequiel Carvalho et al.. OPTOELECTRONIC DEVICES WITH ANISOTROPIC RESPONSE.. In: Anais do workshop INEO 2023. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2023. Available in: https//www.even3.com.br/anais/workshop-do-ineo-2023/613102-OPTOELECTRONIC-DEVICES-WITH-ANISOTROPIC-RESPONSE. Access in: 13/06/2024


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