The emission manners of organic light-emitting diodes（OLEDs） have experienced almost three-decade evolution.In this review,we briefly summarized the emission manners of OLEDs including：（ⅰ） emission from singlet ...The emission manners of organic light-emitting diodes（OLEDs） have experienced almost three-decade evolution.In this review,we briefly summarized the emission manners of OLEDs including：（ⅰ） emission from singlet exciton;（ⅱ） emission from triplet exciton;（ⅲ） emission from singlet exciton converted from triplet exciton.Then we introduced a new type of OLEDs with the emission from doublet exciton,wherein organic neutral radicals are used as emitters.Due to the spin-allowed transition of doublet excitons,using neutral radicals as emitters is believed to be a new way to break the 25%upper limit of internal quantum efficiency of OLEDs.The progress of emissive stable neutral radicals is also shortly reviewed.展开更多
基金financial support from the Ministry of Science and Technology of China(No.2015CB655003)National Natural Science Foundation of China(No.61275036)
文摘The emission manners of organic light-emitting diodes（OLEDs） have experienced almost three-decade evolution.In this review,we briefly summarized the emission manners of OLEDs including：（ⅰ） emission from singlet exciton;（ⅱ） emission from triplet exciton;（ⅲ） emission from singlet exciton converted from triplet exciton.Then we introduced a new type of OLEDs with the emission from doublet exciton,wherein organic neutral radicals are used as emitters.Due to the spin-allowed transition of doublet excitons,using neutral radicals as emitters is believed to be a new way to break the 25%upper limit of internal quantum efficiency of OLEDs.The progress of emissive stable neutral radicals is also shortly reviewed.
