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Organic Light Emitting Transistors: Fundamentals, Materials and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Electronic Materials".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 9861

Special Issue Editor


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Guest Editor
Department of Electronics and Nanoengineering, Aalto University, Espoo, Finland
Interests: organic materials and devices; light emission and sensing; organic thin film transistors; carbon materials; carbon and metal oxide nanostructures

Special Issue Information

Dear Colleagues,

Organic semiconductor-based devices such as organic light emitting diodes (OLEDs), solar cells, memories, and organic field-effect transistors (OFETs) are expected to simplify manufacturing and enable novel functionalities with respect to devices based on conventional materials.

In particular, organic light-emitting transistors (OLETs) are increasingly gaining interest due to their two-fold functionality of behaving as thin-film transistors and being capable of generating, sensing, and controlling light under appropriate bias conditions. Intrinsically very different from well-known diode counterpart (OLEDs) in terms of structures and functioning (transistor vs. diode), OLETs are simpler and cheaper to fabricate, potentially less power-consuming and can be easily integrated in complex architectures.

Organic light-emitting transistors still represent a rather unexplored class of devices, thus offering the possibility of investigating several key aspects and fundamental physical phenomena, as well as moving towards the improvement of the performances. This certainly requires a cross-disciplinary effort in terms of materials study and device development.

We invite contributions from the latest research and innovations in the field of organic light-emitting transistors. The Special Issue will cover (but not be limited to) the following topics in the field of organic light emitting transistor:

  • Fundamentals and novel materials;
  • Field-effect charge transport, light emission, and sensing mechanisms;
  • State-of-the-art light emitting and sensing devices;
  • Simulations;
  • Novel approaches to improve light management;
  • Stress, lifetime, and encapsulation;
  • Novel applications.

It is our pleasure to invite you to submit review articles, original papers, and communications for this Special Issue “Organic Light-Emitting Transistors: Fundamentals, Materials, and Applications”.

Prof. Caterina Soldano
Guest Editor

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Keywords

  • Organic electronics
  • Organic light-emitting transistors (OLETs)
  • Organic semiconductors
  • Organic materials
  • Light emission
  • Light sensing
  • Field-effect charge transport

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Published Papers (2 papers)

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Research

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15 pages, 2921 KiB  
Article
High-k Fluoropolymers Dielectrics for Low-Bias Ambipolar Organic Light Emitting Transistors (OLETs)
by Ahmed Albeltagi, Katherine Gallegos-Rosas and Caterina Soldano
Materials 2021, 14(24), 7635; https://doi.org/10.3390/ma14247635 - 11 Dec 2021
Cited by 5 | Viewed by 3326
Abstract
Organic light emitting transistors (OLETs) combine, in the same device, the function of an electrical switch with the capability of generating light under appropriate bias conditions. In this work, we demonstrate how engineering the dielectric layer based on high-k polyvinylidene fluoride (PVDF)-based [...] Read more.
Organic light emitting transistors (OLETs) combine, in the same device, the function of an electrical switch with the capability of generating light under appropriate bias conditions. In this work, we demonstrate how engineering the dielectric layer based on high-k polyvinylidene fluoride (PVDF)-based polymers can lead to a drastic reduction of device driving voltages and the improvement of its optoelectronic properties. We first investigated the morphology and the dielectric response of these polymer dielectrics in terms of polymer (P(VDF-TrFE) and P(VDF-TrFE-CFE)) and solvent content (cyclopentanone, methylethylketone). Implementing these high-k PVDF-based dielectrics enabled low-bias ambipolar organic light emitting transistors, with reduced threshold voltages (<20 V) and enhanced light output (compared to conventional polymer reference), along with an overall improvement of the device efficiency. Further, we preliminary transferred these fluorinated high-k dielectric films onto a plastic substrate to enable flexible light emitting transistors. These findings hold potential for broader exploitation of the OLET platform, where the device can now be driven by commercially available electronics, thus enabling flexible low-bias organic electronic devices. Full article
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Review

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34 pages, 20632 KiB  
Review
Engineering Dielectric Materials for High-Performance Organic Light Emitting Transistors (OLETs)
by Caterina Soldano
Materials 2021, 14(13), 3756; https://doi.org/10.3390/ma14133756 - 5 Jul 2021
Cited by 17 | Viewed by 5355
Abstract
Organic light emitting transistors (OLETs) represent a relatively new technology platform in the field of optoelectronics. An OLET is a device with a two-fold functionality since it behaves as a thin-film transistor and at the same time can generate light under appropriate bias [...] Read more.
Organic light emitting transistors (OLETs) represent a relatively new technology platform in the field of optoelectronics. An OLET is a device with a two-fold functionality since it behaves as a thin-film transistor and at the same time can generate light under appropriate bias conditions. This Review focuses mainly on one of the building blocks of such device, namely the gate dielectrics, and how it is possible to engineer it to improve device properties and performances. While many findings on gate dielectrics can be easily applied to organic light emitting transistors, we here concentrate on how this layer can be exploited and engineered as an active tool for light manipulation in this novel class of optoelectronic devices. Full article
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