Gold Coordination-Accelerated Multi-Resonance TADF Emission for Efficient Solution-Processible Ultrapure Deep-Blue
Xiu-Fang Song1, Sai Luo1, Nengquan Li1
1Shenzhen Key Laboratory of New Information Display and Storage Materials, Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, College of Materials Science and Engineering, Shenzhen University, 518055, Shenzhen, P. R. China.
Angewandte Chemie (International Ed. in English)
|August 30, 2024
Summary
Researchers developed dual gold-coordinated multi-resonance molecules for efficient, ultrapure blue organic light-emitting diodes (OLEDs). This breakthrough achieves short excited state lifetimes and vibrant blue hues, advancing OLED technology.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Multi-resonance (MR) emitters are promising for high-resolution organic light-emitting diodes (OLEDs).
- Achieving ultrapure blue color with short excited state lifetimes in MR emitters remains a challenge.
- Existing MR emitters often struggle to meet the stringent requirements for CIEy (<0.046) and emission peak (>440 nm) simultaneously.
Purpose of the Study:
- To design and synthesize novel dual gold-coordinated MR molecules.
- To achieve efficient and short-lived ultrapure blue thermally activated delayed fluorescence (TADF) emission.
- To investigate the impact of gold coordination on the photophysical properties of MR emitters.
Main Methods:
- Design of dual gold-coordinated MR molecules.
- Synthesis and characterization of the dinuclear Au(I) complex (iPrAuBN).
- Photophysical measurements including emission spectra, excited state lifetime, and electroluminescence in solution-processed OLEDs.
Main Results:
- The dinuclear Au(I) complex, iPrAuBN, exhibits narrowband deep-blue emission (peak max 448 nm, FWHM 29 nm).
- Gold coordination significantly reduces the delayed fluorescence lifetime from 60.6 μs to 7.8 μs.
- Solution-processed OLEDs with iPrAuBN show ultrapure blue electroluminescence (peak max 442 nm, FWHM 19 nm, CIEy 0.036) with 14.8% external quantum efficiency.
Conclusions:
- Dual gold coordination is an effective strategy for achieving short-lived, ultrapure blue TADF emission in MR emitters.
- iPrAuBN represents a significant advancement in developing high-performance blue OLEDs.
- The developed materials pave the way for next-generation high-resolution displays and lighting applications.
