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Highly Efficient Au(I) Alkynyl Emitters: Thermally Activated Delayed Fluorescence and Solution-Processed OLEDs
Fei-Hu Yu1,2, Xiu-Fang Song3, Guan-Hao Liu1,2
1Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190, Beijing, P. R. China.
New gold(I) complexes with alkynyl ligands exhibit efficient thermally activated delayed fluorescence (TADF) for organic light-emitting diodes (OLEDs). These emitters achieve high quantum yields and external quantum efficiencies in solution-processed devices.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Two-coordinate coinage metal complexes are promising emitters for organic light-emitting diodes (OLEDs).
- Thermally activated delayed fluorescence (TADF) enables efficient light emission in OLEDs.
Purpose of the Study:
- To develop novel green to yellow TADF gold(I) complexes with alkynyl ligands.
- To investigate the structure-property relationships governing TADF emission in these complexes.
- To evaluate their performance as emitters in solution-processed OLEDs.
Main Methods:
- Synthesis of gold(I) complexes featuring modified alkynyl ligands and carbene ligands.
- Photoluminescence quantum yield (PLQY) measurements in doped films.
- Spectroscopic analysis and density functional theory (DFT) calculations.
- Fabrication and characterization of OLED devices.
Main Results:
- Developed novel gold(I) complexes exhibiting TADF emission from green to yellow.
- Achieved high photoluminescence quantum yields (PLQYs) up to 0.76 in doped films.
- Demonstrated maximum external quantum efficiencies (EQEs) of up to 20% in solution-processed OLEDs.
- Correlated ligand modifications (amino groups on alkynyl ligands) with excited-state properties and TADF characteristics.
Conclusions:
- The synthesized gold(I) complexes are highly efficient TADF emitters for OLED applications.
- Ligand design, specifically electron-donating groups on alkynyl ligands, is crucial for tuning TADF properties.
- These complexes represent a significant advancement in materials for high-performance, solution-processed OLEDs.
