Abstract
The condensation of 3,3′-diaminobenzidine with different substituted salicylaldehyde afforded three dimeric salophen ligands H4L1-H4L3. Subsequently, their corresponding dimeric salophen platinum(II) complexes Pt2L1-Pt2L3 were prepared through the metallation of ligands with K2PtCl4. The ligands and complexes were characterized by 1H NMR, infrared spectroscopy, mass spectrometry and elemental analysis and their thermal stabilities, photophysical properties, and electrochemical behavior were further investigated in detail. Using Pt2L1 as phosphorescent emitting materials, deep red light-emitting devices were fabricated with moderate efficiency. The maximum current efficiency, power efficiency, and brightness for the 3.0 wt % Pt2L1 doped OLED are 1.39 cd A−1, 0.74 lm·W−1 and 1774 cd m−2, respectively. Given the synthetic simplicity and ease of structural variation, the preliminary results here indicate that these dimeric salophen complexes are good candidates for phosphorescent OLED.
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