Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State.
Teng TengJinfan XiongGang ChengChangjiang ZhouXialei LvKai LiPublished in: Molecules (Basel, Switzerland) (2021)
A new series of tetrahedral heteroleptic copper(I) complexes exhibiting efficient thermally-activated delayed fluorescence (TADF) in green to orange electromagnetic spectral regions has been developed by using D-A type N^N ligand and P^P ligands. Their structures, electrochemical, photophysical, and electroluminescence properties have been characterized. The complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 0.71 at room temperature in doped film and the lifetimes are in a wide range of 4.3-24.1 μs. Density functional theory (DFT) calculations on the complexes reveal the lowest-lying intraligand charge-transfer excited states that are localized on the N^N ligands. Solution-processed organic light emitting diodes (OLEDs) based on one of the new emitters show a maximum external quantum efficiency (EQE) of 7.96%.
Keyphrases
- density functional theory
- molecular dynamics
- room temperature
- energy transfer
- quantum dots
- light emitting
- ionic liquid
- single molecule
- high frequency
- gene expression
- magnetic resonance imaging
- magnetic resonance
- genome wide
- mass spectrometry
- molecular docking
- molecular dynamics simulations
- molecularly imprinted
- reduced graphene oxide
- solid phase extraction