Advanced Displays: OLED, QLED, and Beyond

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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