Invented by Seok-Hwan Hwang, Young-Kook Kim, Yoon-Hyun Kwak, Jong-hyuk Lee, Kwan-Hee Lee, Min-Seung Chun, Samsung Display Co Ltd

The market for Organic Light Emitting Devices (OLEDs) and Flat Panel Display Devices (FPDDs) comprising the same has been experiencing significant growth in recent years. OLED technology has revolutionized the display industry with its superior image quality, energy efficiency, and flexibility. As a result, the demand for OLED-based FPDDs has been steadily increasing, leading to a thriving market. OLEDs are a type of display technology that uses organic compounds to emit light when an electric current is applied. Unlike traditional liquid crystal displays (LCDs), OLEDs do not require a backlight, resulting in thinner and lighter displays. This unique feature allows for more flexibility in design and enables the creation of curved and even rollable displays. One of the key drivers of the OLED market is the growing demand for high-quality displays in various industries, including consumer electronics, automotive, and healthcare. OLEDs offer vibrant colors, high contrast ratios, and wide viewing angles, making them ideal for applications such as smartphones, televisions, and smartwatches. Additionally, the automotive industry has started adopting OLED displays for infotainment systems and instrument clusters, further boosting the market growth. Energy efficiency is another significant advantage of OLED technology. OLED displays consume less power compared to LCDs, as they only require energy to illuminate the pixels that are active. This energy-saving feature has made OLEDs increasingly popular in portable devices, where battery life is a crucial factor. Moreover, the growing focus on sustainability and environmental consciousness has further propelled the demand for energy-efficient OLED displays. The market for OLEDs and FPDDs comprising the same is also benefiting from advancements in manufacturing processes. Companies are investing in research and development to improve the efficiency and lifespan of OLEDs, as well as reduce production costs. This has led to the development of new materials and manufacturing techniques, making OLED displays more affordable and accessible to a wider range of consumers. However, despite the numerous advantages, the OLED market still faces some challenges. One of the main obstacles is the limited lifespan of OLED displays, particularly the blue OLEDs, which tend to degrade faster than other colors. Manufacturers are actively working on addressing this issue by developing new materials and technologies to enhance the longevity of OLED displays. Furthermore, the OLED market faces tough competition from LCD technology, which has been dominant in the display industry for many years. LCDs have a well-established supply chain and manufacturing infrastructure, making them more cost-effective for large-scale production. However, OLED technology continues to gain traction due to its superior image quality and flexibility, and it is expected to gradually replace LCDs in various applications. In conclusion, the market for OLEDs and FPDDs comprising the same is witnessing significant growth due to the increasing demand for high-quality displays, energy efficiency, and flexibility. With ongoing advancements in manufacturing processes and materials, OLED technology is expected to continue its upward trajectory and become the display technology of choice in various industries.

The Samsung Display Co Ltd invention works as follows

The organic light-emitting device includes: a substrate, a first electrode, a second one, an organic layer between them, including an emission layer. One of the electrodes is reflective, the other semitransparent, or transparent, the organic layer contains a layer with at least one compound having at most one carbazole group. The organic light-emitting device is characterized by low driving voltages, high brightness, good color purity, high efficiency and long life.

Background for Organic Light Emitting Device and Flat Panel Display Device Comprising the Same

1. “1.

The present invention relates to an organic light emitting device and a flat panel display device, and more particularly, to an organic light emitting device including an organic layer containing a phenylcarbazole-based compound.

2. “2.

When a current flows through the organic layer, it emits light. This is done by recombination between electrons and holes. Organic light emitting displays are lightweight and have simple components, an easy fabrication procedure, superior image quality, as well as a wide viewing area. Organic light emitting devices are also capable of achieving dynamic images with high color purity. “Organic light emitting devices have low-power consumption and low-drive voltage properties suitable for portable electronic equipment.

Organic Light Emitting Devices” have a multilayer organic layer consisting of an electron injection, emission, and hole transport layers. Instead of a single layer, a multi-layer structure is used to increase efficiency and lower the driving voltage. Japanese Patent Laid Open Publication No. “2002-252089 discloses a organic light emitting apparatus including a hole transportation layer.

However, the driving voltages, current densities, brightness, color purity and efficiency of an organic light emitting devices do not meet desired standards. These properties need to be improved.

The present invention is an improved organic light-emitting device.

The present invention provides an electronic light-emitting device that includes an organic layer with excellent hole mobility, between two electrodes, capable of producing resonance when the device is operated. It also provides an organic device having a hole injection film between the electrodes, which has a predetermined thickness range, as well as a flat panel device including the organic device.

The organic layer includes at least one compound represented by Formulae 1 and 2 below.

Here, the X can be either a C1-C30 substituted alkylene, C2-C30 substituted alkenylene, C6-C30 substituted arylene, C2-C30 substituted heteroarylene, or a C2-C30 substituted hetero ring.

Each R1, each C2-30 hetero ring can optionally be bound to one another in order to form an unsaturated or saturated carbon ring. R4 and C5 can also be bound together to form the same saturated or unesaturated carbon rings.

each Ar1, Ar2 or Ar3 is independently a C6-C30 substituted or nonsubstituted aryl or heteroaryl C2-C30 group;

Each Y is independently a C1-C30 substituted alkyl group or aryl group (substituted or not), and a C2-C30 hetero-ring substituted, or not,

Each n is an independent integer between 0 and 5.

According to another aspect, an organic light-emitting device is provided that includes: a substrate, a first electrode, a second electrolyte, and an organic layer between them, which contains an emission layer with a red emission area and a hole injector layer with a region under the emission region. One of the first and second electrodes is a transparent or semitransparent electrode, while the other one is a reflective.

According to another aspect, an organic light-emitting device is provided that includes: a substrate, a first electrode, a second electrolyte, and an organic layer between them, which contains an emission layer with a green emission area and a hole injector layer containing a region under the emission region. One of the first and second electrodes is a transparent or semitransparent electrode, while the other one is a reflective.

According to another aspect, an organic light-emitting device is provided that includes: a substrate, a first electrode, a second electrolyte, and an organic layer between them, which contains an emission layer with a blue emission area and a hole injector layer with a region under the emission region. One of the first and second electrodes is a transparent or semitransparent electrode, while the other one is a reflective.

According to another aspect, the invention provides a flat-panel display device that includes the organic light-emitting device. The first electrode is electrically coupled to either a source electrode, or a drain electrolyte, of a thin-film transistor.

The organic light emitting devices has low driving voltage and excellent current density. They also have high brightness, excellent color purity, high efficiency and a long lifespan. The organic light emitting devices have a long lifetime.

The present invention is described in greater detail with reference to the drawings that accompany it, which show exemplary embodiments. The invention can be embodied many ways and is not limited to the forms shown here. These embodiments have been provided to make this disclosure thorough and complete and to fully convey the idea of the invention to those in the know.

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