In fact it wasn’t until blue LEDs were created and it took over 20 years for the price to come down for economic viability. The scientists that worked on blue L

In fact it wasn’t until blue LEDs were created and it took over 20 years for the price to come down for economic viability. The scientists that worked on blue LEDs won the Nobel Prize in physics for their work. This came some 70 years after the first LEDs.