What They Say
A hat tip to DSCC’s subscription newsletter for alerting me to an announcement by Porotech, a start-up in Cambridge, UK, that had slipped under our radar. The company has just announced its first product which ehances the use of inGaN for red LEDs. Traditionally, red LEDs are based on aluminum indium gallium phosphide (AlInGaP) materials and having to use different materials for red, blue and green is a big challenge for microLED developers (hence the interest in companies such as Aledia, Gl? and Plessey that are addressing the same problem in their own ways).
Porotech’s native red InGaN micro-LEDs, based on a new class of porous GaN semiconductor materials, have a wavelength of 640 nm at 10 A/cm², and improved performance over conventional AlInGaP and colour-converted red at very small pixels and pitches. The company said that it uses standard semiconductor processes to create the porous materials.
The start-up raised £1.5m ($2.1 million) in seed funding earlier this year.
What We Think
I have tended to think that colour conversion, as provided by phosphors and QDs is most likely to solve the problem of different semiconductors for different coloured LEDs, but red is a problem because of the relatively long wavelength in microdisplays with very small pixels. There’s a lot of activity going on to solve the problems in other ways. (BR)
