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Organic luminescent materials and devices
Organic luminescent materials and devices
Organic light-emitting diodes (OLEDs) are light-emitting diodes based on organic semiconductors. Due to their self-luminous, adjustable molecular structure of luminescence wavelength, wide viewing angle, fast response speed, soft light, low cost and large area, With advantages such as flexibility and bendability, it is considered to be a new generation of display and lighting technology. Since Chinese-American Professor Deng Qingyun reported low-voltage, high-efficiency double-layer OLEDs in 1987, OLEDs have been extensively studied in terms of materials, devices, physics, theory, mechanism, and applications, which has greatly promoted the development of OLEDs. The development of the OLEDs industry has also promoted the establishment of the discipline of organic optoelectronics. At present, OLEDs have been well applied in smart phones, TVs, wearable electronic devices, automotive lighting and other fields. Among them, South Korea's Samsung and LG took the lead in achieving mass production in the world. In recent years, with the gradual development and growth of domestic display companies such as BOE, Visionox, China Star Optoelectronics and Hehui Optoelectronics, as well as domestic material companies such as Changchun Oled Material Tech Co.,Ltd, Beijing Aglaia Technology Development Co., Ltd, and Eternal Material Technology, it has also greatly promoted the development of China's OLEDs industry. In the process of OLEDs research, Chinese scientists and scientific researchers have played a very important role and made many original works, such as the principle of using phosphorescent materials to improve the efficiency of electroluminescent devices proposed by Academician Ma Yuguang, the new concept of design of luminescent materials such as "hybrid local charge transfer state" (HLCT) and "thermal exciton", and the new phenomenon and new materials of aggregation-induced luminescence proposed by Professor Tang Benzhong, The new principle and materials of free radical bilinear luminescence proposed by Professor Li Feng have promoted the development of new generation of OLEDs materials and devices, and laid a foundation for the development of OLEDs industry in China. However, there are still many key scientific and technical issues to be solved urgently in OLEDs, such as efficient and stable blue light-emitting materials and devices, high-efficiency narrow-band light-emitting materials and devices, low-cost large-area process technology, flexible technology, driving technology, exciton dynamics Research and decay mechanism, device aging mechanism, theoretical simulation and design of materials and devices, etc. Therefore, in order to better understand the development of the field of OLEDs and promote academic exchanges, Chinese Journal of Luminescence specially launched a special issue on "Organic Light-Emitting Diodes (OLEDs)", focusing on key issues, latest developments, and related aspects of OLEDs materials, devices and applications. The challenges and future development trends are summarized, hoping to provide reference for further research and industrialization of OLEDs.
主题关键词：   organic light-emitting diodeexcitonssinglet statestriplet statesexciplexthermally activated delayed fluorescenceinkjet printinghot excitonmetal phosphorescent complexesdegradation mechanism

Preface

     Sunshine is the starting point of natural energy, and the recognition and utilization of light is a sign of human civilization and progress. The discovery of light energy distribution (spectrum) and wave-particle duality of photons is the basis of modern physics. The use of fire was the first controllable light source of ancient humans, "It is the first time that human beings have dominated a natural force to separate human beings from animals." At the end of the 19th century, the invention of electric light source (electric lamp) changed the fire-based lighting mode that has lasted for millions of years, and human beings entered a new era. In the information era, in addition to the traditional lighting function, the light source is in the transmission of information (laser) And the terminal display application field of information has become an indispensable key element. At the same time, people also noticed that China's lighting accounts for 25% of the total electric energy, and the proportion will further increase with the use of light sources in information, display, etc. China is in short supply of energy. The government has put forward the "dual carbon" strategy. The development of efficient and green light-emitting materials and devices is an important way to save energy and reduce emissions.

     Organic light-emitting materials and devices (OLED) is a new generation of display and lighting technology. China has formed a large-scale industry. Since the 1990s, OLED research in China has achieved a number of important achievements in basic research and industrial technology after 30 years of development. This OLED album of the Chinese Journal of Luminescence focuses on the new progress of Chinese scholars in the field of organic luminescence, including materials, devices, new phenomena and principles, and also attracts contributions from the industry. It is an important phased summary of the OLED field in China.

     Mr. Xu Xurong is the pioneer and founder of Luminescence in China. He has devoted his life to the cause of China's luminescence industry and is determined to illuminate the whole of China. He is a shining example for our future generations. On behalf of OLED colleagues, I would like to express our memory and respect for Mr. Xu Xurong on this album.

 

Ma Yuguang

Member of Chinese Academy of Sciences

Guest Editor-in-chief

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