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Issue 36, 2017
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Highly efficient blue phosphorescent iridium(III) complexes with various ancillary ligands for partially solution-processed organic light-emitting diodes

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Abstract

One homoleptic facial and five novel highly efficient blue heteroleptic iridium(III) complexes were designed and synthesized by selecting 2-(4-fluoro-3-(trifluoromethyl)phenyl)pyridine as cyclometalated ligands and 2,4-pentanedione, 2-(3-(trifluoromethyl)-1H-1,2,4-triazol-5-yl)pyridine, picolinic acid, 2-(1H-imidazol-2-yl)pyridine and 2-(1H-tetrazol-5-yl)pyridine as ancillary ligands, respectively. The alternation of ancillary ligands could finely tune the photophysical properties of the phenylpyridine-based complexes, particularly with respect to emission wavelength, photoluminescence quantum yield (ΦPL), full width at half maximum (FWHM), etc. The phosphors designed not only exhibit excellent solubility in commonly used solvents with robust chemical stability but also show bright emissions in the pure blue region with very high absolute ΦPL up to 0.98 in solution and relatively narrow FWHMs up to 52 nm. Furthermore, based on these highly efficient blue phosphors, high-performance partially solution-processed blue organic light-emitting diodes have been successfully fabricated. The electroluminescence peak, 1931 Commission Internationale de L’Eclairage coordinate and FWHM of the device based on Ir4 are all superior to the device based on FIrpic. In addition, the maximum efficiencies of the device based on Ir4 (21.15 cd A−1, 12.07 lm W−1) are also higher than those of the device based on FIrpic (18.89 cd A−1, 11.26 lm W−1) under the same conditions.

Graphical abstract: Highly efficient blue phosphorescent iridium(iii) complexes with various ancillary ligands for partially solution-processed organic light-emitting diodes

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Publication details

The article was received on 06 Jun 2017, accepted on 17 Aug 2017 and first published on 17 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC02496G
Citation: J. Mater. Chem. C, 2017,5, 9306-9314
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    Highly efficient blue phosphorescent iridium(III) complexes with various ancillary ligands for partially solution-processed organic light-emitting diodes

    P. Tao, Y. Zhang, J. Wang, L. Wei, H. Li, X. Li, Q. Zhao, X. Zhang, S. Liu, H. Wang and W. Huang, J. Mater. Chem. C, 2017, 5, 9306
    DOI: 10.1039/C7TC02496G

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