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Isomeric Fused Benzocarbazole as a Chromophore for Blue Fluorescent Organic Light-Emitting Diodes

Abstract

In the present work, we report 7H-benzo[c]carbazole (BCz) based two isomeric chromophores, benzo[b]indolo[1,2,3-lm]carbazole (NI-1) and benzo[c]indolo[3,2,1-jk]carbazole (NI-2), formed by the fusion of BCz with phenyl ring. Two blue fluorescent emitters, N6,N6,N12,N12-tetraphenylbenzo[b]indolo[1,2,3-lm]carbazole-6,12-diamine (NIDPA-1) and N10,N10,N13,N13-tetraphenylbenzo[c]indolo [3,2,1-jk]carbazole-10,13-diamine (NIDPA-2), were developed by functionalizing the NI-1 and NI-2 chromophores with diphenylamine donors, respectively. The influence of the fusion position on the light-emitting performances of the emitters was investigated. The NIDPA-1 emitter fused through the naphthalene unit of BCz showed weak charge-transfer character. Whereas the NIDPA-2 emitter fused through the phenyl unit of BCz displayed a strong charge-transfer character, which red-shifted the emission spectrum of NIDPA-2. The NIDPA-1 doped blue device showed higher quantum efficiency, smaller full width at half maximum, and thus better blue color purity than the NIDPA-2 doped device. However, the NIDPA-2 device offered longer device lifetime and maximum luminance (Lmax) of above 70,000 cd/m2 than the NIDPA-1 device. However, the exceptional stability of both devices under high luminance (> 60,000 cd/m2) and current density (> 600 mA/cm2) demonstrates the significance of the NI based chromophores to develop stable blue emitters for the OLED applications.

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Supplementary files

Article information


Submitted
11 Mar 2020
Accepted
17 May 2020
First published
18 May 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Isomeric Fused Benzocarbazole as a Chromophore for Blue Fluorescent Organic Light-Emitting Diodes

V. V. Patil, K. H. Lee and J. Y. Lee, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/D0TC01268H

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