Highly efficient exciplex organic light-emitting diodes incorporating a heptazine derivative as an electron acceptor

Abstract

Highly efficient exciplex systems incorporating a heptazine derivative (HAP-3MF) as an electron acceptor and 1,3-di(9H-carbazol-9-yl)benzene (mCP) as an electron donor are developed.

Thermally Activated Delayed Fluorescence in Polymer–Small-Molecule Exciplex Blends for Solution-Processed Organic Light-Emitting Diodes

“…This is different from the previously observed dependence of the CT energy upon changing the donor− acceptor ratio. 23,27 However, if extremely large excess of PVK is used, this leads to inefficient local emission of the donor, which reduces the contribution of efficient exciplex emission. A similar situation may occur in devices, leading to recombination on the PVK, thus reducing EQE.…”

Efficient exciplex emission from intramolecular charge transfer material

“…Both intra molecular charge transferred (ICT) materials and exciplexes formed between electron donors and acceptors are recognized with TADF character [12][13][14][15]. Up till now, a great deal of ICT materials and exciplexes were proved have high emitting efficiencies [11,[16][17][18][19][20]. Among which, the most impressive OLEDs based on blue and green ICT emitters performed high EQE of 19.5% and near 30% respectively [11,13,21].…”

Highly efficient tandem full exciplex orange and warm white OLEDs based on thermally activated delayed fluorescence mechanism

“…The efficiency of RISC could be enhanced through a small DE (SÀT) , so the EQE of exciplex OLEDs can be further improved. Many papers had report highly efficient exciplex OLEDs with above 5% EQE in terms of RISC processes, but the reports had mainly concentrated on single color OLEDs, especially green emissive exciplex OLEDs [15][16][17].…”