Green LEDs are a leading light for microLED displays
Emitting a green light without colour conversion techniques, a proprietary 2D planar gallium nitride on silicon (GaN on Si) process has been developed by Plessey to emit green light without colour conversion for a brighter colour.
Typically, to produce a green light, LED manufacturers apply phosphors or quantum dot conversion materials to native blue LEDs to convert short wavelength, typically 450nm, blue light to red or green wavelengths. Effficiency is around 10 to 30 per cent, reports Plessey.
Plessey’s native green LEDs are formed inherently using its proprietary GaN-on-Si epitaxial growth process similar to the native blue LEDs. The principal difference is the amount of indium incorporated in the quantum well structures of the LED. With no colour conversion losses, the native green light emission is orders of magnitude times brighter than colour converted process for microLEDs. The dominant green wavelength of 530nm and full width, half maximum wavelength of 31nm, makes the green light particularly suitable for colour displays. Additionally, the green emission exhibits soundwavelength stability versus current density, reports Plessey.
Plessey’s green native GaN delivers higher luminance than a standard blue device with green colour conversion techniques. Plessey adds that its manufacturing method for green coloured LEDs increases the light output for microLED displays.
Plessey provides full-field emissive microLED displays that combine very high-density RGB pixel arrays with high-performance CMOS backplanes to produce very high-brightness, low-power and high-frame-rate image sources for head-mounted displays (HMDs), and augmented reality (AR) and virtual reality (VR) systems.
Plessey operates 150mm and 200mm wafer processing facilities to undertake design, test and assembly of LED products, and a comprehensive suite of photonic characterisation and applications laboratories.
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