The technical field to which this achievement belongs is the field of electronic science and technology, involving optics and optoelectronics, semiconductor optoelectronic devices, electronic tube technology, reliability technology, computer science and technology and other disciplines.

Vacuum fluorescent displays (VFD), LED lamps, and organic light-emitting displays (OLED) are light-emitting devices that are widely used in the field of display and lighting in today's society and are in great market demand. VFD is often due to poor emission performance of cathode filaments and difficult to accurately control its temperature. Light emitting devices (VFD/LED/OLED) have unreasonable photoelectric performance design and low life performance indicators, which affect the reliability and market share. In addition, conventional life prediction is not only costly, but also takes a long time and has large errors, and it is impossible to design reliable light-emitting devices that meet customer needs based on life performance indicators in a short time. This project extends the service life of the VFD by improving the filament emission performance and temperature control process. Through research on brightness characteristics, qualitative and quantitative models of the life performance and design brightness of the light-emitting device are obtained. Through the research and development of the light-emitting layer structure and materials, the light emitting performance of the light-emitting device is improved. Rapid evaluation of the life performance of the light-emitting device is completed through accelerated life testing, probability statistics and brightness decay models. After more than ten years of technological research, many key technological breakthroughs have been made, a new generation of products have been obtained, and they have been promoted and applied on a large scale.

Main technical invention contents:

1. Key technologies based on improving filament emission performance. Creatively established a temperature characteristic model of the VFD filament, obtained the inherent rules between voltage or current and temperature during the design and production process of the VFD filament, and successfully solved the bottleneck problem of difficulty in optimal control of the temperature. By improving the filament manufacturing process and the filament post-processing process, the emission performance and stability of the filament have been effectively improved, the qualified rate of finished products has been increased by more than 10%, and the life of the VFD by more than 30%, adapting to the mass production and use of products.

2. Key technologies based on optoelectronic performance improvement. A theoretical numerical model of brightness characteristics was innovatively established, an empirical formula for the change of VFD luminous efficiency with anode voltage was determined, and a white organic electroluminescent device and a manufacturing method that can achieve stable chromaticity, low cost, and efficient luminous efficiency were proposed. White light digital tubes and LED lighting lamps with high brightness and uniform emission were developed. A qualitative and quantitative relationship model between product design brightness and life performance improvement was obtained, thereby improving the optoelectronic performance of the light-emitting device. It effectively solves the core technical problems of uneven brightness, instability and unreasonable life design method, and has been well promoted and applied.

3. Key technologies based on rapid assessment of life performance. A rapid prediction model for the life of light-emitting devices was built using probability statistical methods and brightness decay methods, accelerated life tests were carried out, and the acceleration parameters used to predict the average life of light-emitting devices were determined, thereby completely solving the technical bottleneck that it is difficult to evaluate life performance in a short time. After the promotion and implementation of this technology, the new product development cycle and cost have been greatly reduced, and the pass rate and market share of light-emitting devices have been increased.

During the completion of the project, 20 patents were applied for, including 9 authorized invention patents and 6 utility model patents, and another 5 invention patents were under review. In addition, 3 software copyrights were obtained and 57 academic research papers were published. Among them, SCI and EI included 31, and the overall project reached the domestic leading level. This technical achievement has been promoted and applied in many vacuum fluorescent display and LED lamp manufacturers such as Zhejiang BOE Display Technology Co., Ltd. and Shanghai Tianyi Electric Co., Ltd., as well as the Key Laboratory of New Display Technology and Application Integration of the Ministry of Education of Shanghai University. Direct economic benefits exceed 250 million yuan, and at the same time they have promoted my country's relevant technological progress in the international arena and achieved good social benefits.