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29 March 2019

Plessey’s new native green LEDs boosts output for micro-LED displays

Plessey Semiconductors Ltd of Plymouth, UK says that it has developed its proprietary two-dimensional (2D) planar gallium nitride on silicon (GaN-on-Si) process to emit green light without the need for color conversion techniques.

To produce green light, LED makers typically apply phosphors or quantum dot conversion materials to native blue LEDs. These materials then convert short-wavelength (typically 450nm) blue light to red or green wavelengths with typically 10-30% efficiency.

Plessey’s native green LEDs are formed inherently using its proprietary GaN-on-Si epitaxial growth process, similarly to the native blue LEDs, with the principal difference being the amount of indium that is incorporated in the quantum well structures of the LED. With no color conversion losses, the native green emission is orders of magnitude times brighter than the color-converted process for micro-LEDs, says the firm. With a dominant green wavelength of 530nm and a full width half maximum (FWHM) of 31nm, the green is suited to color displays, it adds. Also, the green emission exhibits outstanding wavelength stability versus current density, it is claimed.

“Plessey already provides powerful, efficient native blue micro-LEDs and, through this innovation in our growth technology, Plessey has produced world-leading high-performance native green micro LEDs, which will provide for next-generation display and illuminator devices for our customers,” says chief operating officer Mike Snaith.

Tags: Plessey GaN-on-Si microLED

Visit:  www.plesseysemiconductors.com/products/microleds

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