Star-Shaped Diketopyrrolopyrrole–Zinc Porphyrin that Delivers 900 nm Emission in Light-Emitting Electrochemical Cells

Mariza Mone, Shi Tang, Petri Murto, Birhan Abdulahi, Christian Larsen, Jia Wang, Wendimagegn Mammo, Ludvig Edman*, Ergang Wang*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The development and application of a deep near-infrared (NIR) emitting star-shaped diketopyrrolopyrrole–Zn-porphyrin compound, ZnP(TDPP)4, is reported. The structure, conjugation, and planarity of the porphyrin compound were carefully tuned by molecular design, which resulted in a low-energy photoluminescence peak at 872 nm. The ZnP(TDPP)4 compound was employed as the emissive guest in light-emitting electrochemical cells (LECs), which also comprised the conjugated polymer poly[1,3-bis(2-ethylhexyl)-5-(5-(6-methyl-4,8-bis(5-(tributylsilyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophen-2-yl)thiophen-2-yl)-7-(5-methylthiophen-2-yl)-4H,8H-benzo[1,2-c:4,5-c′]dithiophene-4,8-dione] (PBDTSi-BDD) as the majority host, an ionic liquid as the electrolyte, and two air-stabile electrodes. These systematically optimized host–guest LECs featured a peak electroluminescence at 900 nm, which was delivered at a significant radiance of 36 μW/cm2 and at a low drive voltage of 3.8 V. It is notable that this is the most redshifted NIR emission attained from an LEC device to date, and as such, this work introduces Zn porphyrins as a sustainable and tunable option for emerging emissive NIR applications.
Original languageEnglish
Pages (from-to)9721-9728
JournalChemistry of Materials
Volume31
Issue number23
DOIs
Publication statusPublished - 10 Dec 2019
MoE publication typeA1 Journal article-refereed

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