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Issue 20, 2020
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Effect of the triptycene scaffold on the photophysical, electrochemical and electroluminescence properties of the iridium(iii) complex

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Abstract

A new iridium(III) complex Ir(tbt)2(fppz) (2) (fppzH = 2-(3-trifluoromethyl-1H-pyrazol-5-yl)-pyridine) with a triptycenylbenzothiazole (tbt) ligand and its parent complex Ir(bt)2(fppz) (1) with a phenylbenzothiazole (bt) ligand have been synthesized and characterized. The decomposition temperature (Td(5%)) of complex 2 is 395 °C, which is 16 °C higher than that of parent complex 1. Complex 2 showed an emission peak at 546 nm with a PLQY of 67.8%. When compared with complex 1, its luminescent wavelength red-shifted by 11 nm, the PLQY increased by 13% and the luminescent lifetime shortened by 20%. Moreover, the luminescence quenching of complex 2 at a high concentration (30 wt% in PMMA) is found to be effectively prevented, and the PLQY of complex 2 is three times more than that of complex 1. The electron-donating nature of the triptycene scaffold pushes up the HOMO level of complex 2. As a result, complex 2 achieves a higher non-doped device performance, revealing a maximum current efficiency/EQE of 12.6 cd A−1/5.5%, which are obviously higher than that of complex 1 (9.8 cd A−1, 3.8%). The doped device of complex 2 shows a maximum current efficiency/EQE of 29.8 cd A−1/11.8%. These findings suggest that the comprehensive performance of iridium(III) complexes can be obviously improved by the careful introduction of a triptycene scaffold.

Graphical abstract: Effect of the triptycene scaffold on the photophysical, electrochemical and electroluminescence properties of the iridium(iii) complex

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Supplementary files

Article information


Submitted
17 Apr 2020
Accepted
30 Apr 2020
First published
01 May 2020

New J. Chem., 2020,44, 8587-8594
Article type
Paper

Effect of the triptycene scaffold on the photophysical, electrochemical and electroluminescence properties of the iridium(III) complex

Y. Zhou, D. Xu, W. Cheng, Y. Wang, B. Tong, G. He and Y. Tian, New J. Chem., 2020, 44, 8587
DOI: 10.1039/D0NJ01930E

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