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Two-Coordinate Copper(I)/NHC Complexes: Dual Emission Properties and Ultralong Room-Temperature Phosphorescence
Jiayi Li1, Liding Wang1, Zifeng Zhao1
1Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry and Applications, Beijing Engineering Technology Research Centre of Active Display, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
Angewandte Chemie (International Ed. in English)
|January 28, 2020
Summary
Novel copper(I) complexes exhibit dual emission (fluorescence and phosphorescence). Selective deuteration achieved ultralong room-temperature phosphorescence (RTP) with a 140 ms lifetime, highlighting potential for advanced luminescent materials.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Photophysics
Background:
- Copper(I) complexes are versatile photoluminescent materials with tunable properties.
- Two-coordinate copper(I) complexes with N-heterocyclic carbenes offer unique structural and emissive characteristics.
Purpose of the Study:
- To synthesize and characterize novel two-coordinate copper(I)-N-heterocyclic carbene complexes.
- To investigate their dual emission properties and elucidate the underlying emissive mechanism.
- To achieve ultralong room-temperature phosphorescence (RTP) through targeted molecular design.
Main Methods:
- Synthesis of two-coordinate Cu(I)-N-heterocyclic carbene complexes.
- X-ray crystallography to determine crystal structure and packing.
- Photophysical characterization including emission spectra and lifetime measurements under various conditions.
- Selective deuteration of the carbazole group to enhance phosphorescence.
Main Results:
- Two novel two-coordinate Cu(I)-N-heterocyclic carbene complexes were successfully synthesized.
- These complexes displayed unique dual emission, exhibiting both fluorescence and phosphorescence.
- The emissive mechanism was identified as originating from the locally excited state of the carbazole moiety.
- Ultralong RTP with a lifetime of 140 ms was achieved via selective deuteration.
Conclusions:
- The study deepens the understanding of luminescence mechanisms in two-coordinate Cu(I) complexes.
- Provides insights into design strategies for tuning photophysical properties.
- Demonstrates the potential of these complexes as ultralong RTP materials for various applications.
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
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