A Nine-ring Fused Terrylene Diimide Exhibits Switching Between Red TADF and Near-IR Room Temperature Phosphorescence

Overview

Journal Chem Sci

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2024 Jun 14

PMID 38873070

Authors

Shivangee Jha

Kundan Singh Mehra

Mandira Dey

Sujesh S

Debashree Ghosh

Pradip Kumar Mondal

Maurizio Polentarutti

Jeyaraman Sankar

Affiliations

Soon will be listed here.

Abstract

Herein, we report the first example of a terrylene diimide derivative that switches emission between thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) in the red region. By design, the molecule TDI-cDBT boasts a symmetrical, consecutively fused nine-ring motif with a kite-like structure. The rigid core formed by the annulated dibenzothiophene moiety favoured efficient intersystem crossing and yielded a narrow-band emission with a full-width half maxima (FWHM) of 0.09 eV, along with high colour purity. A small Δ of 0.04 eV facilitated thermally activated delayed fluorescence, enhancing the quantum yield to 88% in the red region. Additionally, it also prefers a direct triplet emission from the aggregated state. The room temperature phosphorescence observed from the aggregates has a longer emission lifetime of 1.8 ms, which is further prolonged to 8 ms at 77 K in the NIR region. Thus, the current strategy is successful in not only reducing Δ to favour TADF but also serves as a novel platform that can switch emission from TADF to RTP depending upon the concentration.

Citing Articles

Single-molecule detection of a terrylenediimide-based near-infrared emitter.

Sujilkumar S, Maret P, Vinod K, John A, Hariharan M Chem Sci. 2024; .

PMID: 39360012 PMC: 11441463. DOI: 10.1039/d4sc03861d.

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