Ruijuan Yao, Di Liu, Yongqiang Mei
Sep 1, 2017
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Influential Citations
3
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Journal
Journal of Photochemistry and Photobiology A-chemistry
Abstract
Abstract Two novel tricyclometalated heteroleptic iridium complexes, namely Ir(dfbpy)2(pt) and Ir(dfbpy)2(dfppy), were designed and synthesized for application as blue phosphors in optoelectronic devices. 2′,6′-difluoro-2,3′-bipyridine (dfbpy) was used as the cyclometalating ligand. In comparison with the parent homoleptic Ir(dfbpy)3, the newly developed 3-(1-benzyl-1H-1,2,3-triazol-4-yl)pyridine (pt) with higher triplet energy than dfbpy or 2-(2,4-difluorophenyl)pyridine (dfppy) was used as the ancillary ligands to tune the electronic properties of these heteroleptic complexes. Both complexes emit strong blue phosphorescence with high quantum yields. The incorporation of high-energy ancillary ligand pt in Ir(dfbpy)2(pt) makes the highest-energy sub-band intensity in the phosphorescence spectrum increase relative to those of the parent Ir(dfbpy)3, and leads to narrower phosphorescence spectrum than the analogue Ir(dfbpy)2(dfppy) as well, which may provide a practical method to adjust the phosphorescence spectra and color purity of the complexes.