Abstract: This paper involves a review on the advancing history of electroluminescent and displaying devices based on semiconducting polymers(PLED), a series of main breakthroughs in this field in recent years. The different PLED structures and their features of nowaday ongoing research works are compared, the basic working principle of PLED are briefly introduced to the point, a precise defination of PLED quantum efficiency is given and the methods about how to improve the quantum efficiency are comprehensively described. The design, synthesis of charge transport polymers and their application in PLEDs are presented taking the prevalent multilayer PLEDs as examples. The application fields, existent problems, and future development of PLEDs are commented as a conclusion remark.

Key words: Semiconducting polymer, Electroluminescent, Displaying devices