GE ups colour vibrancy in LEDs with phosphor powder
LED used in backlit display is disadvantaged by a low quality red component that leads to insufficient colour rendering. Scientists at GE Lighting and GE Global Research hence developed a phosphor powder that claims to enable more vibrant display in smartphones, tablets and televisions.
GE's patented solution involves adding potassium fluorosilicate (PFS) doped with manganese as a red line emitter to an LED. The use of the PFS phosphor in LED systems generates a reddish colour that is sharper, cleaner and truer compared to nitride phosphor—resulting in less colour bleed and a richer picture.
Anant Setlur, a materials scientist and leader on the phosphors effort at GE Global Research, said: "Backlit displays consist of an array of LEDs fed into a waveguide to filter out red, green, and blue. In most of the devices you see on the market today, the red component in the LED is low quality, causing greens to look yellowish; this negatively impacts the overall picture quality. What we've achieved here allows for more natural colour in consumer electronics. The difference in picture quality is stunning."
GE Ventures has licensed the technology patents to Sharp Corporation and Nichia Corporation, both of which are manufacturing and packaging LEDs containing PFS phosphor material for use as LED backlights in a wide range of LCD display products. In fact, several display companies have recently launched tablets and smartphones containing LED devices supplied by these licensees.
Setlur demonstrates the breakthrough phosphor technology that claims to vastly enhance that colour and crispness of images displayed in LED devices. Source: GE
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