Carbazole derivatives containing one or two tetra-/triphenylethenyl units as efficient hole-transporting OLED emitters
| Autor: | Sohrab Nasiri, Juozas V. Grazulevicius, Aina Petrauskaite, Monika Cekaviciute, Dmytro Volyniuk, Oleksandr Bezvikonnyi, Jurate Simokaitiene, Viktorija Andruleviciene |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
biology Carbazole Process Chemistry and Technology General Chemical Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology biology.organism_classification Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences chemistry.chemical_compound chemistry Electric field Ionization OLED Tetra Quantum efficiency 0210 nano-technology Glass transition |
| Zdroj: | Dyes and Pigments. 168:93-102 |
| ISSN: | 0143-7208 |
| DOI: | 10.1016/j.dyepig.2019.04.045 |
| Popis: | New efficient carbazole-based emitters containing tetra-/triphenylethene units were developed for boosting efficiency of non-doped fluorescent organic light-emitting diodes. Comparable study of the properties of derivatives containing one or two tetra-/triphenylethenyl units was performed using various experimental and theoretical techniques. Depending on the substitution pattern, emitters exhibited strong blue or green emission, which was enhanced by aggregation. Compounds with two substituents showed higher glass transition temperatures (up to 120 °C) and lower ionization potentials (of ca. 5.15 eV) comparing to mono substituted derivatives. Time-of-flight hole drift mobility values of the studied compounds with two substituents reached 10−3 cm2/V at high electric fields. Non-doped fluorescent OLEDs based on carbazole derivative containing two tetraphenylethenyl units demonstrated extremely high external quantum efficiency as for simple fluorescent organic light-emitting devices, which reached 5.32%. |
| Databáze: | OpenAIRE |
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