Advanced Displays: OLED, QLED, and Beyond

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Optoelectronics".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 4701

Special Issue Editors


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Organic Nanoelectronics Laboratory, KNU Institute for Nanophotonics Applications (KINPA), Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
Interests: organic nanoelectronic materials and devices; biomedical materials and devices; new materials and processing; nanofabrications and measurements
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LAPLACE (Laboratoire Plasma et Conversion d’Energie), Université de Toulouse, Toulouse, France
Interests: lighting science and technology; sustainable lighting systems; impacts of lighting on performance and well-being; lighting for developing countries
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Display devices play a crucial role in visualizing information in 2D and/or 3D. After cathode ray tube (CRT), which has heavy and bulky features, liquid crystal display (LCD) was introduced, having a relatively thin and flat shape, still being widely applied for large television sets. However, the liquid components and backlight units in LCDs are a drawback in the production of ultrathin and flexible displays.

Organic light-emitting devices (OLEDs), which are ultrathin, flexible, and transparent, have been studied and successfully commercialized for smart phones, television sets, etc. Individual red, green, and blue OLED pixels are employed in the and medium OLED displays, whereas white OLEDs act as a common pixel together with color filters and/or color-changing media (quantum dots, etc.) in large television sets. Despite f these successes, organic materials and devices still face many challenges. Considering the current structure of active-matrix (AM) OLED displays, both OLED units and thin-film transistors (TFTs) are better to unite for durable displays for flexible and rollable applications. In particular, a breakthrough concept of new device structures has been long-anticipated because the current device configurations are basically based on typical structures that are more than twenty years old.

In addition to OLEDs, quantum dot-based light-emitting devices (QLEDs) have attracted keen interest because inorganic quantum dots (QDs) can change emission colors via size control. Particular attention has focused on the stable nature of inorganic QDs, which can overcome the stability issue of OLEDs. However, the shape factor of QDs poses various hurdles during QLED fabrication. Therefore, in-depth studies should be conducted toward achieving the commercialization of genuine QLEDs.

New ideas can generate advanced displays beyond OLEDs and QLEDs, which can be realized in the future.

In this regard, this Special Issue aims to publish valuable research works (materials and devices) in the field of advanced displays including OLEDs, QLEDs, new light-emitting devices, transistors, etc.

Dr. Youngkyoo Kim
Dr. Laurent Canale
Guest Editor

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Keywords

  • advanced displays
  • OLED
  • QLED
  • organic materials
  • quantum dots
  • stability
  • efficiency
  • transistors
  • diodes
  • TFTs

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Published Papers (1 paper)

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Research

9 pages, 2291 KiB  
Article
Hole Injection Role of p-Type Conjugated Polymer Nanolayers in Phosphorescent Organic Light-Emitting Devices
by Sooyong Lee, Hwajeong Kim and Youngkyoo Kim
Electronics 2021, 10(18), 2283; https://doi.org/10.3390/electronics10182283 - 17 Sep 2021
Cited by 7 | Viewed by 3464
Abstract
Here, we report the hole injection role of p-type conjugated polymer layer in phosphorescent organic light-emitting devices (OLEDs). Poly(3-hexylthiophene) (P3HT) nanolayers (thickness = ~1 nm thick), which were subjected to thermal annealing at 140 °C by varying annealing time, were inserted between indium [...] Read more.
Here, we report the hole injection role of p-type conjugated polymer layer in phosphorescent organic light-emitting devices (OLEDs). Poly(3-hexylthiophene) (P3HT) nanolayers (thickness = ~1 nm thick), which were subjected to thermal annealing at 140 °C by varying annealing time, were inserted between indium tin oxide (ITO) anodes and hole transport layers (N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)-benzidine, NPB). The 1 nm-thick P3HT layers showed very weak absorption in the visible light range of 500~650 nm. The device results disclosed that the presence of P3HT layers were just able to improve the charge injection of OLEDs leading to an enhanced luminance irrespective of thermal annealing condition. The highest luminance and efficiency were achieved for the OLEDs with the P3HT layers annealed at 140 °C for 10 min. Further annealing for 30 min resulted in turn-down of device performances. The emission color was almost unchanged by the presence of P3HT layers even though the color coordinates were marginally fluctuated according to the annealing time. The present result delivers the possibility to use p-type conjugated polymers (i.e., P3HT) as a hole injection layer in OLEDs. Full article
(This article belongs to the Special Issue Advanced Displays: OLED, QLED, and Beyond)
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