3 ms·

And for the past 10 years, almost every cheap electronic device has been permanently glowing blue because of them. EDIT: aren't modern blue LEDs based on GaN?

• Gordonjcp 4y ago
  Yah, the first ones were a very different shade of blue and really expensive.
• qbrass 4y ago
  Silicon Carbide LEDs were the first true blue (not blue-violet) ones, but they were horribly inefficient. Doped GaN made blue LEDs viable, and LEDs in general more available.