This article is a very good background explanation of the rationale for this year's Nobel physics prize and a good overview of LED technology and its history. I

This article is a very good background explanation of the rationale for this year's Nobel physics prize and a good overview of LED technology and its history. I learned a lot here about the economic and manufacturing trade-offs involved in promoting use of LEDs for indoor lighting rather than incandescent bulbs. A worthy read for a day when LEDs are very much in the news.