I want to know the answer to the following question:
What color LED was demonstrated in 1994?
All the background I'm provided with is that "In parallel, Isamu Akasaki and Hiroshi Amano in Nagoya were working on developing the important GaN nucleation on sapphire substrates and the demonstration of p-type doping of GaN. Nakamura, Akasaki and Amano were awarded the 2014 Nobel prize in physics for their work.". Is that enough to answer the question?
Answer: no