Effect of end group functionalisation of small molecules featuring the fluorene-thiophene-benzothiadiazole motif as emitters in solution-processed red and orange organic light-emitting diodes

Fell, Valentin H.K. and Findlay, Neil J. and Breig, Benjamin and Forbes, Clarissa and Inigo, Anto R. and Cameron, Joseph and Kanibolotsky, Alexander L. and Skabara, Peter J. (2019) Effect of end group functionalisation of small molecules featuring the fluorene-thiophene-benzothiadiazole motif as emitters in solution-processed red and orange organic light-emitting diodes. Journal of Materials Chemistry C, 7 (13). pp. 3934-3944. ISSN 2050-7534 (https://doi.org/10.1039/C8TC02993H)

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Abstract

A series of red fluorescent materials (compounds 1-4), which each contain the symmetric fluorene-thiophene-BT-thiophene-fluorene core, is presented along with their performance in solution-processed OLED devices. Extending the molecular conjugation through end-capping with additional fluorene units (compound 2), or through incorporation of donor functionalities (compounds 3 and 4) improves OLED performance relative to the parent compound 1. Notably, incorporating triphenylamine donor groups in compound 3 led to solution-processed OLED devices operating with a peak luminance of 2888 cd m −2 and a low turn-on voltage (3.6 V).

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