Blue LED invented in early 90s by Shuji Nakamura together with
Isamu and Hiroshi Amano. When blue LED combines with red LED
and green LED it became a new lighting innovation which leads to
the invention of white LED including LED monitor. Red and green LED
were invented before blue LED. So, it became obstacles to challenge
scientist around the world to make a blue LED. Without blue LED it
can’t make a white LED including computer monitor , TV , smartphone.
Nowadays blue LED can found in daily life such as smartphones monitor
TV. As a result, blue LED became an important factor to create a white
LED which has longer lifetime than fluorescent bulbs.