The reporter learned from the Ningbo Institute of Materials of the Chinese Academy of Sciences yesterday that after four years of hard work, the researchers of the special fiber and nuclear energy engineering laboratory of the institute cooperated with Jaehyung Lee, an expert in materials and engineering at Lingnan University in South Korea, to find out the fluorescent transparent ceramic sealing technology. It breaks through the bottleneck of two-phase composite ceramic interface compatibility and low-light scattering loss, and successfully inserts ceramic phosphor into aluminum-based transparent ceramic matrix with thermal expansion coefficient matching.
“The thermal conductivity of the transparent ceramic sheet reaches 14 W/m·deg., and the silica gel and epoxy resin are 0.4 W/m·degree, which is equivalent to increasing the thermal conductivity of the passive light-emitting module in the conventional package by two orders of magnitude.†Dr. Deng Qihuang, a material science student at Donghua University, was a member of the research team. In May 2014, he was the postdoctoral research report of the postdoctoral workstation training of the Institute and successfully went out. He told reporters that the research team obtained the light-transparent transparent ceramic plate models with different illumination requirements by adjusting the color and content of the phosphor.
“Solid-state lighting is known as the fourth-generation electric light source after incandescent, fluorescent and high-intensity discharge lamps.†Deng Qihuang said that the energy conversion efficiency of incandescent and fluorescent lamps can only reach 5% and 20%, respectively. The energy conversion efficiency of the light-emitting diodes exceeds 50%. Therefore, the power consumption of LEDs is only 10% and 40% of incandescent and fluorescent lamps, respectively. "In particular, the combination of blue light chips and yellow phosphors for white light illumination will be an important direction for next-generation lighting."
In recent years, LEDs mainly use blue chip excitation or composite yellow phosphor to synthesize high quality white light. However, the silica gel and epoxy resin mixed ceramic phosphors currently used have large heat dissipation and stability problems, which have become the main constraints for LEDs used in highways, automobile headlights, marine fisheries, stage lighting and other high-power lighting. .
The researchers collaborated with the relevant packaging companies to package the transparent ceramic chip onto a commercial Blu-ray chip and obtained the lamp beads of the all-ceramic LED. Through the test of related performance, the color temperature of the lamp bead reaches 4500K, and the luminous efficiency is 107 lumens/watt, which has reached the luminous efficacy level of the LED mainstream market. “Fluorescent transparent ceramic sealing technology will greatly simplify the mixing and coloring process in traditional LED packaging,†said Deng Qihuang. At the same time, this technology is expected to completely standardize fluorescent ceramics of different colors and reduce manual errors.
At present, this work has been supported by the National Natural Science Foundation of China, the Zhejiang Outstanding Youth Fund and the Ningbo International Cooperation Project.
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