Efficient bifunctional materials based on pyrene- and triphenylamine-functionalized dendrimers for electroluminescent devices

• Main Authors: T. Keawin, N. Prachumrak, S. Namuangruk, S. Pansay, N. Kungwan, S. Maensiri, S. Jungsuttiwong, T. Sudyoadsuk, V. Promarak
• Format: Journal
• Published: 2018
• Subjects: Agricultural and Biological Sciences
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84940973375&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/44228
• Institution: Chiang Mai University

© The Royal Society of Chemistry. To realize highly efficient bifunctional blue-light emitting and hole-transporting materials for OLEDs, a series of pyrene- and triphenylamine-peripheral functionalized carbazole dendrimers, namely G1PYR, G2PYR, G1TPA and G2TPA, were designed, synthesized and characterized. Especially, G2PYR having four pyrene units substituted on the 2 nd generation carbazole dendritic scaffold exhibited a strong blue emission with high T g amorphous and good film-forming properties. Simple structured blue OLED (λ EL = 463 nm) using G2PYR as emissive layer and Alq3-based green OLED (λ EL = 512 nm) using G2PYR as hole-transporting layer with high luminance efficiencies (η) and low turn-on voltages (V on ) of 5.89 cd A -1 and 3.1 V, and 5.15 cd A -1 and 2.6 V were attained, respectively.