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The effect of molecular structure on the efficiency of 1,4-diazine–based D–(π)–A push-pull systems for non-doped OLED applications
- Source :
- Dyes and Pigments. 187:109124
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- A series of novel D–A and D–π–A push-pull systems based on a pyrazine and quinoxaline acceptor, bearing various electron-donating triphenylamine and carbazole moieties, are compared. A significant difference in electrochemical and photophysical properties was found depending on molecular structure. The compounds have strong solvatochromic properties. Quinoxaline-containing systems exhibit delayed fluorescence (DF) in thermal vacuum deposition films. Despite the low quantum yield of fluorescence in the solid state (less than 10%), organic light-emitting diodes with sufficiently high efficiency (4.2 cd/A) have been fabricated on the basis of this push-pull systems. The best results were obtained for compounds exhibiting DF. The possible channel for increasing the efficiency of OLED can be associated with the “hot excitons” mechanism.
- Subjects :
- Diazine
Materials science
Pyrazine
Carbazole
Process Chemistry and Technology
General Chemical Engineering
Quantum yield
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
Triphenylamine
01 natural sciences
Acceptor
0104 chemical sciences
chemistry.chemical_compound
Quinoxaline
chemistry
OLED
0210 nano-technology
Subjects
Details
- ISSN :
- 01437208
- Volume :
- 187
- Database :
- OpenAIRE
- Journal :
- Dyes and Pigments
- Accession number :
- edsair.doi...........1f94dbb3f3157f8a5e8333b0aae7be0f