Blue LED

or: a Nobel Prize for 3 a.m. scrolling

Red and green LEDs were already around, but a bright blue one stumped labs and companies for about thirty years¹, until three researchers in Japan finally grew good enough crystals of gallium nitride in the early 1990s and won the Nobel Prize in Physics for it. Blue was the missing piece for white light, and the best white LEDs now squeeze out more than 300 lumens per watt, against about 16 for an old light bulb, and can last up to 100,000 hours².

And we use it to light up a phone at 3 a.m. to watch strangers cook pasta.

How it works, badly

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Red and green LEDs were easy. Blue took about 30 years.
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Three researchers finally grew the right crystal.
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Add phosphor, and blue becomes white.
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Then we use it to watch pasta videos at 3 a.m.

Wait, is that real?

Yes, it really did win the Nobel Prize.

The thirty-year wait↩

Red and green LEDs existed for decades, but without a bright blue one there was no way to make white LED light. Researchers and companies struggled for about thirty years. Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura succeeded in the early 1990s using gallium nitride, and shared the 2014 Nobel Prize in Physics.

The numbers↩

The best white LEDs exceed 300 lumens per watt, against about 16 for an ordinary incandescent bulb and close to 70 for fluorescent lamps. LEDs can last up to 100,000 hours, compared with about 1,000 for incandescent bulbs and 10,000 for fluorescents. When the prize was awarded, lighting used roughly a quarter of the world’s electricity.

The fine print↩

300 lumens per watt is the record; the LED bulbs you buy at the store are well below that, though still far ahead of incandescents. White LEDs usually make their white with a blue chip under a phosphor coating, which is how most LCD screens are lit, but many phones now use OLED screens, which make light from organic materials instead. And the pasta videos aren’t the LED’s fault.

Sources: Nobel Prize in Physics 2014: press release

Last fact-checked October 28, 2026.