N1,N1,N3,N3-tetra([1,1′-biphenyl]-4-yl)-N5,N5-diphenylbenzene-1,3,5-triamine: Synthesis, optical properties and application in OLED devices as efficient hole transporting material

• A hole transporting material was synthesized and characterized.
• The compound exhibits high hole mobility and excellent thermal stability.
• The resulting device exhibits higher efficiency compared with NPB-device.

A hole-transporting material, N1,N1,N3,N3-tetra([1,1′-biphenyl]-4-yl)-N5,N5-diphenylbenzene-1,3,5-triamine (TDAB-BP), was synthesized by di([1,1′-biphenyl]-4-yl)amine and 3,5-dichloro-N,N-diphenylaniline via Buchwald–Hartwig coupling reaction. The material exhibit high hole mobility, excellent thermal and morphological stability. TDAB-based OLED device exhibited the highest performance in terms of the maximum current efficiency (9.34 cd/A), maximum power efficiency (5.89 lm/W), and maximum external quantum efficiency (6.61%), which is significantly improved than that of the standard device based on 4,4′-bis[N-(1-naphthyl)-N-phenyl-amino]-biphenyl (NPB) (7.12 cd/A, 4.90 lm/W and 5.31%). Furthermore, TDAB-BP shows a higher decomposition temperature (Td) of 505 °C than that of NPB (418 °C). This material could be a promising hole-transporting material, especially for the high-temperature applications of OLEDs and other organic electronic devices.

A hole-transporting material TDAB-BP was synthesized, which exhibits high hole mobility, excellent thermal and morphological stability. Blue OLED device based on TDAB-BP exhibits high performance with the maximum current efficiency of 9.34 cd/A, maximum power efficiency of 5.89 lm/W and maximum external quantum efficiency of 6.61%. TDAB-BP could significantly improve the device performance than traditional NPB.Figure optionsDownload as PowerPoint slide