Near-IR Emitting Iridium(III) Complexes with Heteroaromatic β-Diketonate Ancillary Ligands for Efficient Solution-Processed OLEDs: Structure-Property Correlations

Angewandte Chemie
Sagar KesarkarAlberto Bossi

Abstract

Three NIR-emitting neutral Ir(III) complexes [Ir(iqbt)2 (dpm)] (1), [Ir(iqbt)2 (tta)] (2), and [Ir(iqbt)2 (dtdk)] (3) based on the 1-(benzo[b]thiophen-2-yl)-isoquinolinate (iqtb) were synthesized and characterized (dpm=2,2,6,6-tetramethyl-3,5-heptanedionate; tta=2-thienoyltrifluoroacetonate; dtdk=1,3-di(thiophen-2-yl)propane-1,3-dionate). The compounds emit between λ=680 and 850 nm with high luminescence quantum yields (up to 16 %). By combining electrochemistry, photophysical measurements, and computational modelling, the relationship between the structure, energy levels, and properties were investigated. NIR-emitting, solution-processed phosphorescent organic light-emitting devices (PHOLEDs) were fabricated using the complexes. The devices show remarkable external quantum efficiencies (above 3 % with 1) with negligible efficiency roll-off values, exceeding the highest reported values for solution-processible NIR emitters.

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Citations

May 4, 2017·Chemical Communications : Chem Comm·Kazuya JinnaiChihaya Adachi
Jul 27, 2018·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Marta PenconiAlberto Bossi
Nov 4, 2016·Chemical Society Reviews·Yong-Jun YuanZhi-Gang Zou
Jun 20, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Junting YuWeiguo Zhu
Jun 20, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhaoran HaoYu Liu
Apr 13, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Malika Ibrahim-Ouali, Frédéric Dumur
Apr 30, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Sergei V TatarinStanislav I Bezzubov
Jun 22, 2021·IScience·Kunping GuoFranco Cacialli
Dec 21, 2019·Journal of Chemical Theory and Computation·Marco CazzanigaDavide Ceresoli
Apr 1, 2020·Journal of the American Chemical Society·Xiugang WuPi-Tai Chou

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