2021 Focus:
This project mainly develops the solid-state lighting sources for researching on plant growth. Regarding the development of solid-state light sources, our team has been researching for many years, and the technology has continuously pursued innovation and breakthroughs. In recent years, the solid-state lighting sources have also begun to develop toward deep ultraviolet wavelength region. Thus, it is in line with this trend and application.
Flip-chip (FC) aluminum gallium indium phosphide (AlGaInP) mini light-emitting diodes (mLEDs) with p and n lateral electrode structures and a larger light-emitting area have significant potential for integrating red, green, and blue mLEDs of locally dimmable zones for developing new-generation LED-backlit liquid crystal displays. Herein, an FC AlGaInP mLED having 9 × 6 mil dimensions is fabricated using wafer bonding and transfer technology methods. We propose a patterned n-gallium-arsenide (GaAs) epilayer by etching for ohmic contact and optimizing the specific contact resistance of an FC mLED. The light-output intensity images demonstrated that this etching process improved the uniformity of current distribution and matched the simulation results. Compared with conventional FC mLEDs, the output powers of FC mLEDs with a patterned n-GaAs layer increased from 3.4 % to 4.5 % and the wall-plug efficiency was improved by 1.04 %. Moreover, Ag was applied as a reflector on patterned n-GaAs rather than AuGe. The output power of FC mLEDs with an Ag reflector showed a 3.5 %–8.2 % improvement over FC mLEDs with an AuGe reflector. Finally, FC mLEDs that were encapsulated with epoxy and far-field radiation patterns indicated that packaged FC mLEDs had a smaller divergence angle and narrower viewing angle.



2022 Focus:
1.Improving the quantum efficiency and output power of LED, these are for enhancing the sterilization effect.
2.Optimizing the luminescence type of LED for improving the sterilization efficiency on the production line, we further simulate the production line process, and conduct research on Salmonella in eggs to evaluate the sterilization efficiency.