The Development Of Organic Light-emitting Diodes

The development of OLED materials is the basis for the vigorous development of the OLED industry. The earliest OLED light-emitting materials were fluorescent materials, but the upper limit of the theoretical internal quantum efficiency of fluorescent materials due to spin inhibition can only reach 25%. In 1998, Ma, Forrest and Thompson, etc.

Successively reported the application of phosphorescent materials in OLED materials, which opened the way for breaking the law of spin statistics and using 100% of the energy of all excitons.

However, phosphorescent materials also have certain problems. Because they contain precious metals, they are expensive and the stability of blue light materials has stagnated for a long time.