@Eric_Juma Principle for light-emitting diodes LED (upper left) and example of a blue LED lamp pic.twitter.com/lBL9t0eLcS >@NobelPrize
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@Eric_Juma Principle for light-emitting diodes LED (upper left) and example of a blue LED lamp pic.twitter.com/lBL9t0eLcS >@NobelPrize