On December 18, Swedish Micro LED technology company Polar Light Technologies (PLT) announced the successful production of a 625nm red Micro LED based on a unique pyramid structure. This breakthrough means that PLT has now developed pyramid-structured Micro LEDs in red, green, and blue using the same compound materials, laying the foundation for the development of single-chip RGB displays.
Development of Pyramid-Structured Micro LED
PLT is utilizing Atomic Layer Deposition (ALD) technology to grow its pyramid-structured Gallium Nitride (GaN) Micro LEDs on Silicon Carbide (SiC) substrates. This pyramid structure is grown through an innovative bottom-up method that does not require etching processes. The resulting structure provides the LED chips with narrow beam characteristics, enhancing Micro LED performance while maintaining submicron size.
Significant Improvements in Efficiency
Compared to conventional LEDs, the pyramid-structured Micro LEDs improve internal and external quantum efficiency and light utilization, boosting Augmented Reality (AR) system efficiency by 50 to 200 times. By reducing internal electric field interference and optimizing charge carrier interactions in the quantum wells, these Micro LEDs can emit more light with a clearer and narrower emission spectrum. As a result, pyramid-structured Micro LEDs are ideal for applications requiring precise light control, such as AR systems and miniature projectors.
Overcoming Red Micro LED Challenges
Regarding the successful development of the red product, PLT stated that while blue and green Micro LEDs have been on the market for years, achieving red Micro LEDs has always posed fundamental challenges due to material properties. Existing solutions or alternatives can achieve red light, but they often involve trade-offs in terms of efficiency, manufacturability, or the need to combine with other materials. PLT’s innovative pyramid LED structure concept has overcome these challenges.
Partnership with Finetech for Further Advancements
Notably, in September of this year, PLT announced a partnership with Finetech, a chip bonding solutions developer, to jointly develop Micro LED technology. The partnership has made significant progress in next-generation Augmented Reality (AR), Head-Up Displays (HUD), and Head-Mounted Displays (HMD) Micro LED technology. The two companies developed an improved flip-chip cold bonding technology to ensure precise alignment between Micro LEDs and electronic components.
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