Issue 9, 2020

A novel fluorene–indolocarbazole hybrid chromophore to assemble high efficiency deep-blue fluorescent emitters with extended device lifetime

Abstract

In this work, a novel rigid chromophore was synthesized by the fusion of 9,9-dimethyl-9H-fluorene with indolocarbazole (ICz) for the development of deep-blue fluorescent emitters with high efficiencies and long lifetimes. The 10,10-dimethyl-10H-indeno[2,1-b]indolo[3,2,1-jk]carbazole (IDCz) was utilized as the chromophore for two deep-blue fluorescent emitters synthesized by mono- or di-substitution of electron-donating diphenylamine (DPA) auxochromophore. The systematic investigation of electroluminescence properties of IDCz, IDCz-DPA, and IDCz-2DPA revealed that the external quantum efficiency (EQE), device lifetime, and maximum luminance (Lmax) were increased by increasing the number of DPA units. Moreover, the efficiency roll-off and full width at half maximum (FWHM) were also improved by the DPA substitution. The IDCz-2DPA emitter showed the best performances with a maximum EQE of 5.6%, Lmax of above 47 000 cd m−2, FWHM of 35 nm with little EQE roll-off at high luminance. Additionally, the IDCz-2DPA emitter outperformed the mono-substituted IDCz-DPA in terms of device lifetime by displaying an augmented lifetime (LT80: above 140 h) as compared to that of IDCz-DPA (LT80: 50 h).

Graphical abstract: A novel fluorene–indolocarbazole hybrid chromophore to assemble high efficiency deep-blue fluorescent emitters with extended device lifetime

Supplementary files

Article information

Article type
Paper
Submitted
24 Nov 2019
Accepted
17 Jan 2020
First published
18 Jan 2020

J. Mater. Chem. C, 2020,8, 3051-3057

A novel fluorene–indolocarbazole hybrid chromophore to assemble high efficiency deep-blue fluorescent emitters with extended device lifetime

V. V. Patil, K. H. Lee and J. Y. Lee, J. Mater. Chem. C, 2020, 8, 3051 DOI: 10.1039/C9TC06434F

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