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Thermally Activated Delayed Fluorescence Carbonyl Derivatives for Organic Light-Emitting Diodes with Extremely Narrow Full Width at Half-Maximum
- Source :
- ACS applied materialsinterfaces. 11(14)
- Publication Year :
- 2019
-
Abstract
- Two novel thermally activated delayed fluorescence (TADF) emitters, 3-phenylquinolino[3,2,1- de]acridine-5,9-dione (3-PhQAD) and 7-phenylquinolino[3,2,1- de]acridine-5,9-dione (7-PhQAD), were designed and synthesized based on a rigid quinolino[3,2,1- de]acridine-5,9-dione (QAD) framework. With the effective superimposed resonance effect from electron-deficient carbonyls and electron-rich nitrogen atom, both emitters realize significant TADF characteristics with small Δ ESTs of 0.18 and 0.19 eV, respectively. And, molecular relaxations were dramatically suppressed for both emitters because of their conjugated structure. In the devices, 3-PhQAD realizes superior performance with a maximum external quantum efficiency (EQE) of 19.1% and a narrow full width at half-maximum (FWHM) of 44 nm, whereas a maximum EQE of 18.7% and an extremely narrow FWHM of 34 nm are realized for 7-PhQAD. These superior results reveal that apart from nitrogen and boron-aromatic systems, QAD framework can also act as a TADF matrix with effective resonance effect, and QAD derivatives are ideal candidates to develop TADF emitters with narrow FWHMs for practical applications.
- Subjects :
- Materials science
business.industry
02 engineering and technology
Conjugated system
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Fluorescence
0104 chemical sciences
Full width at half maximum
Nitrogen atom
OLED
Optoelectronics
Carbonyl derivatives
General Materials Science
Quantum efficiency
0210 nano-technology
business
Resonance effect
Subjects
Details
- ISSN :
- 19448252
- Volume :
- 11
- Issue :
- 14
- Database :
- OpenAIRE
- Journal :
- ACS applied materialsinterfaces
- Accession number :
- edsair.doi.dedup.....48c7c11677d6a562360072c57b9bc376