Source: cirosantilli/led-vs-diode
= LED vs diode
{c}
<Direct and indirect band gaps> is an important part of why <diodes> don't emit light apparently.
Bibliography:
* https://www.quora.com/What-is-the-difference-between-an-LED-and-a-diode
* https://youtu.be/9BDTtcRMxpA?t=388 from <video How LEDs work by VirtualBrain> explains the geometry aspect well