Polar Light Technologies has reported the development of 625 nm red light based on the company's non-etching, bottom-up fabrication concept. According to the company, the successful demonstration marks its achievement of red, green, and blue pyramidal micro-LEDs by using the same material compound. The advance lays the foundation for spatial computing and next-generation monolithic RGB display, Polar Light said. Though blue and green micro-LEDs are widely available on the commercial market, achieving a red color has been difficult due to challenges in the necessary material properties. There are several workarounds or alternatives for reaching a red color that each come with some compromises, in terms of efficiency, manufacturability, and/or the need to integrate with other material systems. Polar Light Technologies has reported the capability to build red, green, and blue pyramidal micro-LEDs by using the same material compound. The company created a 625 nm red light micro-LED using its non-etching bottom-up manufacturing concept. Courtesy of Polar Light Technologies. Using Polar Light’s bottom-up approach, Polar Light said, the inevitable strain in the lattice-mismatched indium gallium nitride/gallium nitride structures is reduced, which is necessary for the manufacture of blue, green, and red micro-LEDs with the same material system (i.e., to fabricate monolithic RGB). The technique also provides the possibility to integrate the frontplane with a backplane. Polar Light said that because the method does not require etching, and therefore eliminates the related damages caused by the manufacturing technique, performance is maintained for smaller dimensions. Additionally, the method enables the possibility of sub-micron LEDs and nano-LEDs. Polar Light announced a partnership in October 2024 with FineTek. Earlier in the year, the company named Oskar Fajerson as CEO.