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
Typical_Balance3892 t1_j7mgc3v wrote on February 7, 2023 at 9:26 PM Reply to comment by 4Blu in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23 Hikaru Permalink Parent 24
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