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White LEDs are rapidly being used in daily life due to the increasing luminous efficiency, the continuous price reduction, and the fact that the blue light problem is not worse than that of traditional light sources. Under the circumstance of completely banned incandescent bulbs and switching to energy-saving LED street lamps , it will become the most important indoor and outdoor lighting source in the next few years. Although LED applications continue to advance, the limits of their luminous efficiency have always been an international question, and the packaging technology closely related to light color plays a very important role.
The solid-state lighting team of the Central University of Taiwan has assembled several experts at home and abroad who specialize in optoelectronic thermal color. After three years of research, this year, an important research result was presented, which explored the limits of white LED packaging efficiency. The paper was published in the “Solid State Lighting Journal†in November. In just three weeks, it became the original paper with the highest single-point reading rate. It is also the representative paper of the publication in the first year of the publication, and it has been in a short time. Received two academic paper awards.
Sun Qingcheng, head of the research team and director of the Optoelectronic Center of the Central University, said that the research has a great correlation with the phosphor formula, package geometry and blue chip of white LED. The complexity of system integration is extremely high, so internationally Teams that delve deeper are rare. In order to accurately grasp the limits of packaging efficiency, the research team has developed itself for many years, with the internationally leading phosphor optical model for accurate and systematic simulation and analysis, and the measurement and comparison of six main packaging structures by experiment. It is found that the effective combination of the package structure and the phosphor powder formula is an important factor for improving the packaging efficiency.
The research team found that under the general yellow phosphor, the packaging efficiency after optimizing the combination of phosphor and package structure is theoretically up to about 75%, compared to the general white LED products on the market. It generally falls below 55%, and it is obvious that there is still much room for improvement. The research team adjusted the phosphor formula and package geometry according to the simulation results without affecting the color performance. Under the actual experimental measurement, the package efficiency of nearly 70% was obtained, which is quite close to the theoretical limit value. The leading literature in the literature.
Yang Zongxun, a professor of optoelectronics responsible for color performance, said that in addition to exposing the module limits of packaging efficiency, the study also further promoted the system luminous efficiency limit of white LEDs. What is important is that LED luminous efficiency and color performance are highly correlated. There are some exaggerated reports of luminous efficiency in the world. Some of them are based on the premise of sacrificing color performance and will not be practically applied to general lighting. At the same time, white LEDs with better color performance, although the luminous efficiency may be slightly lower, but because of the wider application range, it is worth the direction of technology investment.
Zhong Deyuan, a professor of optoelectronics at the Department of Thermal Research, further stated that the research team also found that the phosphor has a unique temperature distribution and is actively obtaining accurate temperature field experimental data, which will contribute to the optimal design of heat extraction for high-power white LED package structures.
According to Sun Qingcheng, the research team has developed a new type of package structure based on the above research results, which has the possibility of practicing the theoretical limit of packaging efficiency, and can also display more in the high-power and high color rendering double phosphor package. High packaging efficiency for better energy savings. This new technology has been patented by Taiwan and the United States. At present, two listed companies have cooperated in technology transfer, and another internationally renowned company is negotiating directly in its existing best-selling optoelectronic products. Students participating in the research have also been Domestic related manufacturers have high-paying nets and excellent performance in industry and education.