Making LEDs is more expensive than making compact fluorescent lamps (CFLs) and incandescent bulbs because LED semiconductors are made with gallium.
Silicon, which is typically used for manufacturing semiconductor wafers, does not work well with gallium because it shrinks less when cooling. More rapidly cooling gallium on the end of the silicon rod use to make an ingot (which is later sliced into wafers) cracks and renders the ingot unusable. This has led manufacturers to use more expensive materials like sapphire, which shrinks and cools at almost the same rate as gallium, in order to avoid the shrinkage problem.
LED manufacturing technology is, however, constantly being improved and LEDs are still overall the best value because they last much longer than CFLs and incandescent bulbs.
Make that “silicon rod used…”
Click here to cancel reply.
Sorry,At this time user registration is disabled. We will open registration soon!
Don't have an account? Click Here to Signup
© Copyright GreenAnswers.com LLC