LEDs are an old technology, why did the industries take so long to put them into light bulbs? Was there any technological gap missing?
Electronic – Why did LEDs take so long to appear as light bulbs
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Best Answer
It is not possible to produce white light without an efficient blue LED, either using RGB LEDs or a blue LED + yellow phosphor.
The breakthrough was the invention of the high-brightness Gallium-Nitride blue LED by Shuji Nakamura at Nichia in the early 1990s.
It still took a while to get the overall efficiency up to the level of fluorescent bulbs, and it's only in the last decade that LEDs finally came out on top.