High-efficiency organic light-emitting diodes utilizing thermally activated delayed fluorescence from triazine-based donor–acceptor hybrid molecules
- 27 August 2012
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 101 (9), 093306
- https://doi.org/10.1063/1.4749285
Abstract
We have designed and synthesized a high-efficiency purely organic luminescent material, 2,4-bis{3-(9 H-carbazol-9-yl)-9 H-carbazol-9-yl}-6-phenyl-1,3,5-triazine (CC2TA) comprising the bicarbazole donor and phenyltriazine acceptor units, which is capable of emitting thermally activated delayed fluorescence. The molecular design of CC2TA allows spatial separation of HOMO and LUMO on the donor and acceptor fragments, respectively, leading to an exceptionally small singlet–triplet exchange energy (ΔEST = 0.06 eV) together with a high triplet energy. Furthermore, a high external electroluminescence quantum efficiency as high as 11% ± 1% has been achieved in the sky-blue organic light-emitting diodes employing CC2TA as an emitter.Keywords
This publication has 16 references indexed in Scilit:
- Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversionNature Photonics, 2012
- A Simple Phosphine–Oxide Host with a Multi‐insulating Structure: High Triplet Energy Level for Efficient Blue ElectrophosphorescenceChemistry – A European Journal, 2011
- Thermally Activated Delayed Fluorescence from Sn4+–Porphyrin Complexes and Their Application to Organic Light Emitting Diodes — A Novel Mechanism for ElectroluminescenceAdvanced Materials, 2009
- Nearly 100% Internal Quantum Efficiency in an Organic Blue‐Light Electrophosphorescent Device Using a Weak Electron Transporting Material with a Wide Energy GapAdvanced Materials, 2009
- Analyzing Bipolar Carrier Transport Characteristics of Diarylamino-Substituted Heterocyclic Compounds in Organic Light-Emitting Diodes by Probing Electroluminescence SpectraChemistry of Materials, 2008
- Triplet-exciton quenching in organic phosphorescent light-emitting diodes with Ir-based emittersPhysical Review B, 2007
- White Organic Light‐Emitting Devices for Solid‐State LightingAdvanced Materials, 2004
- Ultrahigh Energy Gap Hosts in Deep Blue Organic Electrophosphorescent DevicesChemistry of Materials, 2004
- High-efficiency electrophosphorescent organic light-emitting diodes with double light-emitting layersApplied Physics Letters, 2002
- Multistage Organic Redox Systems—A General Structural PrincipleAngewandte Chemie-International Edition, 1978