The blue LED is the basic device of the white LED. In this paper, we describe the current technologies and the future views of high-efficiency blue LED. In the blue LED, the internal quantum efficiency and light extraction efficiency close to the theoretical limit can be obtained. On the other hand, the high flux LED technology, there are many challenges to be solved, such as efficiency droop phenomenon. It is expected that the new technology to solve these issues, and to further improve the performance of the LED.
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