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Achieving efficient violet-blue electroluminescence with CIEy <0.06 and EQE >6% from naphthyl-linked phenanthroimidazole–carbazole hybrid fluorophores
- Source :
- Chemical Science. 8:3599-3608
- Publication Year :
- 2017
- Publisher :
- Royal Society of Chemistry (RSC), 2017.
-
Abstract
- In this work, we revealed a new approach for the development of efficient violet-blue emitting materials featuring a hybrid local and charge transfer (HLCT) excited state through the incorporation of naphthyl group(s) as a weak n-type π spacer in a donor–π–acceptor (D–π–A) system. The resulting materials (TPINCz and TPIBNCz) show improved intramolecular charge transfer properties and highly efficient violet-blue fluorescence. It is demonstrated that the pattern of the π spacers has significant influence on the photophysical properties. The incorporation of a naphthyl/binaphthyl spacer between the donor and acceptor moieties can alleviate the common dilemma that enhancing device performance by increasing the charge transfer excited properties often leads to red-shifted emissions. A device using TPINCz as an emissive dopant shows a violet-blue emission with CIE coordinates of (0.153, 0.059) and a record high EQE of 6.56 ± 0.11% at a brightness of 1000 cd m−2. To the best of our knowledge, this performance is the highest among the reported devices with CIEy ≤0.08. Our study provides a new pathway for the design of high-performance violet-blue emitters with a D–π–A architecture in organic electroluminescence applications.
- Subjects :
- Materials science
Dopant
Carbazole
02 engineering and technology
General Chemistry
Electroluminescence
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Fluorescence
Acceptor
0104 chemical sciences
law.invention
chemistry.chemical_compound
chemistry
law
Intramolecular force
Excited state
0210 nano-technology
Light-emitting diode
Subjects
Details
- ISSN :
- 20416539 and 20416520
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Chemical Science
- Accession number :
- edsair.doi...........c4e57f1c6d3fc83cc8513baf4b99cc77