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摘要
A novel sextuple hydrogen-bonding (HB) self-assembly molecular duplex bearing red-emitting perylene diimide (PDI) fluorophores, namely PDIHB, was synthesized, and its molecular structure was confirmed by H-1 NMR, C-13 NMR, TOF-MS and 2D NMR. Compared with the small molecular reference compound PDI, PDIHB shows one time enhanced fluorescence efficiency in solid state (4.1% vs. 2.1%). More importantly, the presence of bulky HB oligoamide strands in PDIHB could trigger effective spatial separation between guest and host fluorophores in thin solid film state, hence inefficient energy transfer occurs between the blue-emitting host 2TPhNIHB and red guest PDIHB in the 2 wt% guest/host blending film. As a result, a solution-processed organic light-emitting diode (OLED) with quite simple device structure of ITO/PEDOT:PSS (40 nm)/PVK (40 nm)/PDIHB (2 wt%): 2TPhNIHB (50 nm)/LiF (0.8 nm)/Al (100 nm) could emit bias-independent warm-white electroluminescence with stable Commission Internationale de L'Eclairage coordinates of (0.42, 0.33), and the maximum brightness and current efficiency of this device are 260 cdm(-2) and 0.49 cdA(-1), respectively. All these results indicated that HB self-assembly supramolecular fluorophores could act as prospective materials for white OLED application.
