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Pyridal[2,1,3]thiadiazole as Strong Electron-Withdrawing and Less Steric Hindrance Acceptor For Highly Efficient Donor-Acceptor type NIR Materials

Abstract

Pyridal[2,1,3]thiadiazole (PT) is an analog of common acceptor benzo[1,2,5]thiadiazole (BT) in charge transfer (CT) chromophore, exhibiting stronger electron-deficient ability and less steric hindrance. Here, we demonstrated the prominent effect of PT as proto-acceptor to construct D-A type NIR emitting materials. The compound p-TPA-PT-CN that combined donor triphenylamine (TPA) and cyano-substituent PT shows NIR emission of ~700 nm, and highly PL efficiency of 0.3 both in solution and solid. The strong D-A interaction in p-TPA-PT-CN results in low energy charge-transfer state. The pyridine nitrogen of PT lowers the steric hindrance between PT and the adjacent TPA donor segment, thereby induces planarity and strong mixing (hybridization) of CT and π-π states (HLCT). Such strong mixing contributes towards higher luminous efficiency. The OLEDs fabricated by utilizing p-TPA-PT-CN as the emitting layer showed an EQE of 1.47 % and Lmax= 640 cd m-2 which is among the good NIR-OLED devices.

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Publication details

The article was received on 31 Aug 2017, accepted on 06 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC03978F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Pyridal[2,1,3]thiadiazole as Strong Electron-Withdrawing and Less Steric Hindrance Acceptor For Highly Efficient Donor-Acceptor type NIR Materials

    J. Jiang, X. Li, M. Hanif, J. Zhou, D. Hu, S. Su, Z. Xie, Y. Gao, B. Yang and Y. Ma, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03978F

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