TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. en.wikipedia.org Submitted by j-merc23 t3_10w8qi9 on February 7, 2023 at 6:12 PM in todayilearned 69 comments 789
Anicron t1_j7nw54v wrote on February 8, 2023 at 3:39 AM Reply to comment by nVr78 in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23 Underrated Permalink Parent 2
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