Seoul Viosys begins mass production of rare-earth-free white light emitter, with chips as small as 10µm

For three decades, white LEDs have depended on rare-earth materials such as yttrium aluminium garnet (YAG) layered onto a blue LED chip (Figure 1). Opto-semiconductor device maker Seoul Viosys Co Ltd (SVC) says that it has now broken that dependence by developing and mass producing a chip that emits white light without rare earths. The chip can be as small as 10µm...