Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 12, Issue 13, Pages 1490-1498Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201700081
Keywords
color-tunable; copper complexes; electroluminescence; organic light-emitting diodes; solution process
Categories
Funding
- Theme-Based Research Scheme [T23-713/11]
- National Key Basic Research Program of China [2013CB834802, 2013CB834801]
- Basic Research Program of Shenzhen [JCYJ20160229123546997, JCYJ20160530184056496]
- Strategic Research Theme of HKU on New Material
- Innovation and Technology Commission of the HKSAR Government [ITS/140/16]
- SRFDP & RGC ERG Joint Research Scheme [M-HKU702/12]
- Guangdong Special Project of the Introduction of Innovative RD Teams
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A series of dppnc-and neocuproine-based CuI complexes (dppnc = 7,8-bis(diphenylphosphino)-7,8-dicarbanido- undecaborate) are synthesized and the emission color of these CuI complexes can be tuned from green to deep red via rational modification of the neocuproine ligand structure. The molecular structures of the emissive CuI complexes, Cu(dppnc)-G (green emitting), Cu(dppnc)-Y (yellow emitting), and Cu(dppnc)-R (red emitting), are characterized and their electronic structures and related transition properties are elucidated by photo-physical and computational (density functional theory) studies. The calculation results suggest that thermally activated delayed fluorescence (TADF) is the emission mechanism for these CuI complexes. Efficient solution-processed green-, yellow-, and red-emitting OLEDs are fabricated based on the emissive complexes as the dopants. High external quantum efficiency (EQE) of 15.20% and current efficiency of 48.15 cdA(-1) at 1000 cdm(-2) are achieved in the green-emitting device with Cu(dppnc)-G. A maximum EQE of 10.17 %, CIE coordinates of (0.61, 0.38) and a maximum electroluminescent peak of 631 nm are achieved in the red device based on Cu(dppnc)-R.
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