Triplet Harvesting with 100% Efficiency by Way of Thermally Activated Delayed Fluorescence in Charge Transfer OLED Emitters

摘要

The Holy Grail of organic light-emitting diodes (OLED) research has been the search for methods to overcome the limitation imposed by charge recombination spin statistics. Upon charge recombination, three times more triplet excitons are generated than singlet excitons; therefore, the maximum internal efficiency of an OLED is limited to 25%,unless methods to "harvest" the triplets, that is, convert them to emissive singlet states, are used.