Anthracene derivatives as efficient emitting hosts for blue organic light-emitting diodes utilizing triplet–triplet annihilation

Thermally activated delayed fluorescence from 3nπ* to 1nπ* up-conversion and its application to organic light-emitting diodes

“…7,8 In addition to these two typical mechanisms of electroluminescence (EL), the efficiencies of OLEDs based on purely organic emitters have also been improved by singlet harvesting through up-conversion of triplet excitons; i.e., a pathway involving delayed fluorescence. [9][10][11][12][13][14][15] However, the theoretical maximum IQE of OLEDs using P-type delayed fluorescence caused by triplet-triplet annihilation is limited to 62.5%, which is not comparable with that of OLEDs employing E-type delayed fluorescence, which is also called thermally activated delayed fluorescence (TADF). Recently, our group realized IQEs of nearly 100% by introducing highly efficient TADF emitters into OLEDs.…”

Triplet fusion delayed fluorescence materials for OLEDs

“…The authors tentatively attributed the high performance of this device to the TF property of anthracene cores. Fukagawa [42] carried out comparison studies on bisanthracene derivatives 12 and 13 to elucidate the correlation between TF properties and intermolecular interactions of the host materials. A device based on compound 13 showing more alleviated intermolecular stacking than 12 was found to show better performance (EQE max : 7.2% vs 5.0%).…”

High performance organic ultraviolet photodetector with efficient electroluminescence realized by a thermally activated delayed fluorescence emitter

“…In this case, the theoretical maximum internal quantum efficiency is only 62.5%. 31 Herein, our device using TADF emitter takes advantage of 100% generated excitons for light emission, which is responsible for the high EL performance of the integrated device.…”