History of LED (Light Emitting Diode)#

LEDs are used everywhere in the world today — for lighting, displays, and signaling.
Let’s take a look at how the LED was born, refined, and developed.

1907 — “Wait… it just glowed. What was that?”#

1907, in a laboratory in England.
Henry Joseph Round, a radio communication engineer, noticed a strange phenomenon when he passed an electric current through a silicon carbide (SiC) crystal.
“Whoa! It’s giving off light at the contact point!”
Round reported the phenomenon in the journal Electrical World.
But at the time, no one imagined that this faint glow would one day replace the lighting of the world.
The light was simply too weak to seem useful.
And so the seed of the LED was quietly buried.

Memory Manufacturers Are Raking In Money#

Samsung Electronics, SK Hynix, and Micron are the world’s three largest memory manufacturers. They generate huge operating profits by producing and selling DRAM. As of December 2025, DRAM demand has surged so much that they reportedly cannot keep up with supply. In other words, DRAM makers are raking in money, and this trend is expected to continue for the foreseeable future. What exactly is DRAM, and why has its demand suddenly skyrocketed? Let me explain why.