Multi-triphenylamine-functionalized dithienylbenzothiadiazoles as hole-transporting non-doped red emitters for efficient simple solution processed pure red organic light-emitting diodes

• Main Authors: Thangthong,A.M., Prachumrak,N., Sudyoadsuk,T., Namuangruk,S., Keawin,T., Jungsuttiwong,S., Kungwan,N., Promarak,V.
• Format: Article
• Published: Elsevier 2015
• Subjects: Chemistry (all); Materials Chemistry; Electrical and Electronic Engineering; Electronic, Optical and Magnetic Materials; Biomaterials; Condensed Matter Physics
• Online Access: http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84924577901&origin=inward; http://cmuir.cmu.ac.th/handle/6653943832/38907
• Institution: Chiang Mai University

© 2015 Elsevier B.V. All rights reserved. To achieve high efficiency solution processed red OLED, a series of new triphenylamine-functionalized dithienylbenzothiadiazoles, namely TB, T3TB and T4TB, as non-doped solution-processed hole-transporting red emitters were synthesized and characterized. Particularly, T3TB having five triphenylamine units substituted on the dithienylbenzothiadiazole core exhibited a good red emission with high Tg amorphous and good film-forming properties. A simple structured non-doped red OLED (ITO/PEDOT:PSS/T3TB(spin coating)/BCP/LiF-Al) with an efficiency (η) of 6.25 cd A-1 at 4.1 mA cm-2 (PE = 5.17 lm W-1), a low turn-on voltage (3.0 V) and a pure red emission (λEL = 656 nm, CIE (x, y) = 0.67, 0.33) was attained.