Researchers at the King Abdullah University of Science and Technology in Saudi Arabia and the Old King Technology City have proposed a novel approach that can fill the "green-yellow" common in multi-fluorescent-based white LED applications due to poor conversion efficiency. "green-yellow gap". SEM image of component structure using two temperature step growth methods (Qdisks electron micrograph embedded in nanowires) The research paper published in the journal ACS Photonics describes a nanowire LED (NW LED) emitting at 588 nm on a low-cost titanium (Ti) thin film/germanium (Si) substrate platform compatible with CMOS processes. Growing. Its compact nanowire layer can grow to a surface density of 9x109 cm^2 with a fill factor of 88%. Component structure showing multiple nanowires growing side by side Each nanowire pin LED structure is embedded in an active region of a stack of 5 layers of 3 nm thick InGaN quantum discs (Qdisks) separated by 10 nm quantum barrier layers. When operating the yellow-light nanowire LEDs alone, the researchers observed a peak emission of 588 nm and a low on-voltage of about 2.5 V at 29.5 A/cm^2 (about 75 mA on a 0.5x0.5mm^2 component). The quantum efficiency is about 39%, and the "efficiency reduction" does not occur until the implantation density of 29.5 A/cm^2 is reached. Next, the researchers showed the benefits of mixing this yellow light with red, green, and blue laser diodes. In the actual setup, the RGB beam is used to illuminate the yellow nanowire LED, just like a phosphor, and a light scattering layer is used in the reflective configuration to add its yellow emission to the white light mixture. The result is a correlated color temperature of approximately 6000K and a color rendering index of 87.7. Yellow light nanowire Boon S. Ooi, director of the Center for Solid State Lighting Technology Innovation and professor of electrical engineering, said the goal of this approach is to reduce the intensity of blue light in white light, creating a warm white light that is more friendly to the human eye, while also being laser-based. Solid-state lighting (SSL) provides a new way to tune color temperature. “At the moment, we have patented this technology,†and this also hints at some future business opportunities. Natural Gas Water Heater,Gas Water Heater,Ce Gas Water Heater,Natural Gas Hot Water Heater xunda science&technology group co.ltd , https://www.gasstove.be
