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>> Korea R&D to Improve OLED Panel Lifetime and Luminescence Core Technology 14th,Apr,2018
In order to improve the performance of organic light-emitting diode (OLED) panels, South Korea is committed to the development of next-generation material and component technologies that use thermally activated delayed fluorescent (TADF) blue substances in place of blue phosphorescence that has lifetime and luminescence issues. Materials, as well as new component technologies that can achieve 8K resolution have also attracted the attention of the industry. It is more proactive in mastering new technologies and patents in new areas in order to increase its competitiveness in the future.
According to ET News, Kim Jae-Hoon, a professor at Hanyang University in Korea, is developing a 50:1 high-efficiency, high-polarization organic light-emitting device technology, which is part of the display core original technology development (KDRC) business. Previous monitor component technology research mainly focused on how to control the intensity of light. The focus of this study was how to control the direction of light in order to improve the brightness and darkness ratio of OLED panels and achieve high efficiency.
The research team is dedicated to removing polarizing films on large OLED panels used in televisions to increase efficiency. Kumoh National University of Technology's research team utilizes existing low-molecular materials to achieve a 50:1 polarization ratio; Hanyang University's research team is dedicated to the study of molecular arrangements and component technologies.
International research has reached a level of 1.1 candelas and a 30:1 polarization ratio, but this team has produced better results. Kim Jae-hoon said that the technology to improve polarization efficiency can be applied not only to OLEDs, but also to 3D Hologram technology. There are not many patents in this field and South Korea has a great chance to seize the market.
The OLED blue phosphorescent material with the highest technical difficulty has attracted attention for its research on alternative materials. Currently, thermally activated delayed fluorescent (TADF) blue materials are considered to be the most effective alternatives to overcome the lifetime, efficiency, and color issues of blue phosphorescent materials.
Compared with red phosphorescent and green phosphorescent materials, the lifetime of the blue phosphorescent material is particularly short, resulting in a reduction in the overall lifetime and reliability of the OLED panel. There are many researches on improving the lifespan, efficiency and color of blue phosphorescent materials in the world, but the technical difficulty is also high.
The latest popular alternative, TADF, has a broad emission spectrum. Although the color purity gradually decreases and the lifetime reduction is limited, the development of technology has improved color purity and life. Although many problems still need to be solved and they cannot be commercialized immediately, the industry has high expectations for TADF and believes that it is the most opportunity to replace the existing blue phosphorescent materials.
However, Sungkyunkwan University professor Lee Jun-yeon (translation) said that the delay of fluorescent substances in overseas universities and international OLED material plants are areas of research has long been followed, followed by the possibility of patent issues. In addition, the mainland is also very active in obtaining patents in the field of OLED materials. Therefore, it is necessary for South Korea to prepare a set of strategies for developing core technologies and obtaining patents.
360°: OLED phosphorescent material
OLED luminescent materials can be roughly divided into two categories: fluorescent and phosphorescent. Although there are many manufacturers of fluorescent materials, the main consideration is their long life, but the disadvantage is that the luminous efficiency is low; in contrast, the future luminous efficiency of phosphorescent materials is still available. There is room for growth, but the disadvantage is that the lifetime is shorter than the fluorescent material, the amount is less than the fluorescent material, and the blue phosphorescent material is still under development.
Currently, UPD (Universal Display Corporation) is the main player in the development of OLED phosphorescent materials, and Nippon Steel Chemical, Panasonic, and Idemitsu Kosan are also engaged in the development of OLED phosphorescent materials.
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