High Electron Affinity Molecular Dopant CN6-CP for Efficient Organic Light-Emitting Diodes

ACS Applied Materials & Interfaces
Yuan LiuSebastian Reineke

Abstract

p-Type molecular doping of organic materials with high ionization energies (IEs) of above 5.50 eV is still a challenge, limiting the use of doping in high-performance organic light-emitting diodes (OLEDs). Here, we investigate the molecular dopant hexacyano-trimethylene-cyclopropane (CN6-CP) with a high electron affinity of 5.87 eV as p-dopant in OLEDs. We show that CN6-CP can be used not only as a dopant in the traditional hole transport material 4,4'-cyclohexylidenebis[ N, N-bis(4-methylphenyl)benzenamine] (TAPC, IE = 5.50 eV) but also effectively dopes the host material tris(4-carbazoyl-9-ylphenyl)amine (TCTA, IE = 5.85 eV), reaching a conductivity of 1.86 × 10-4 S/cm at a molar ratio of 0.25. Using CN6-CP-doped TAPC as hole injection and transport layer, we achieve a low driving voltage of 2.92 V at the practical brightness of 1000 cd/m2 and 3.18 V at a current density of 10 mA/cm2 for a green phosphorescent OLED based on bis[2-(2-pyridinyl- N)phenyl- C](acetylacetonato)iridium(III) (Ir(ppy)2(acac)), together with a maximum external quantum efficiency of 18% and a luminous efficacy of 78 lm/W. The device also exhibits a very low efficiency roll-off at high luminance. Further, by directly adopting CN6-CP-doped TCTA as the in...Continue Reading

References

May 16, 2009·Nature·Sebastian ReinekeKarl Leo
Mar 4, 2011·Chemical Society Reviews·Youtian TaoJingui Qin
Aug 1, 2015·Chemical Reviews·Sebastian ScholzKarl Leo
May 24, 2016·Advanced Materials·Sjoerd A VeldhuisSubodh G Mhaisalkar
May 26, 2017·ACS Applied Materials & Interfaces·Feng LiangLiang-Sheng Liao

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Citations

Apr 4, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Zhiwei PengGuohua Xie
Nov 19, 2021·Chemical Reviews·Alberto D ScaccabarozziThomas D Anthopoulos

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