News: LEDs
26 October 2022
Nitride Semiconductors releases micro-RGB + UV LED chips trial kit
Nitride Semiconductors Co Ltd of Tokushima, Japan says that, in addition to micro-ultraviolet (UV) LEDs with a peak wavelength of 385nm, it has developed three types of indium gallium nitride (InGaN)-based visible micro-LEDs with peak wavelengths of 620nm for red, 510nm for green, and 450nm for blue, grown by metal-organic chemical vapor deposition (MOCVD) on a 4-inch or 6-inch sapphire substrate.
Picture: Red, green, blue, UV, micro LED chip emission spectrum data — 48μm x 48μm chip.
In 2018 the firm achieved high-efficiency light emission at a peak wavelength of 385nm from 12μm x 24μm micro-UV-LEDs (subsequently patented), and it has already supplied samples to many users. The firm has since also developed visible LEDs, in response to many customers requesting micro-sized chips for red, blue and green LEDs. In this case, especially for red LEDs (which are considered to be difficult to realize), InGaN has been used instead of the conventional materials gallium arsenide (GaAs) or gallium phosphide (GaP).
Nitride Semiconductors is developing displays by exciting three types of red, blue and green phosphors with micro-UV-LEDs. Furthermore, it has developed mass-production technology for red, green, blue microchips. So, users can achieve mass production of micro-LED displays through conventional method of mounting three types of micro-LED chips (red, blue and green).
To allow users to compare the characteristics of each color, Nitride Semiconductors has created a micro-RGB + UV LED chips trial kit (a complete set of micro-LEDs with four wavelengths: red, blue, green, and UV). Developers of micro-LED displays can hence try chips with various wavelengths and sizes and select the optimum chip for the mass production of micro-LED displays.
Nitride Semiconductors develops 12μm x 24μm micro UV-LED chips for displays
