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

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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

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Supplementary files

Article information


Submitted
24 Nov 2019
Accepted
17 Jan 2020
First published
18 Jan 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

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, Advance Article , DOI: 10.1039/C9TC06434F

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