In the United States and Canada, there have been many reports of LED street lights that were initially white but have suddenly turned purple. The reason for this change in color of LED street lights ...
It’s hard to believe that the first blue LED didn’t arrive until 1993. They look simple, but looks are deceiving (Fig. 1). 1. Image showing a blue InGaN-based LED with gold wire contacts (0.4 × 0.4 mm ...
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