The Recent Development of Blue LED

Abstract

LED is a very influential light source for its high brightness, good color display and ability to modify the spectra. The performances of red LEDs and green LEDs have been greatly improved but the blue LEDs’ performance is still left behind. In this paper, researchers investigated the frontier research in recent years, including the progress and possible direction in conventional inorganic GaN blue LEDs, quantum dot blue LEDs, organic blue LED, and perovskite blue LED.  The basic working principles of each direction are introduced first and the related characteristics of the materials and the luminance mechanisms are discussed. Then the authors analyze the key influencing factors in each of the above directions and compare the development status, LED performance parameters the stability, luminance efficiency and related advantages and disadvantages. Besides, brief history of the development will be introduced to get a full view of the changes in research idea in the past years. In each direction, a discussion is made with the focus on applications, further challenges, and the possible improvements and some suggestions and expectations of the blue LEDs are put forward.