Abstract
Solution-processed emission layer of organic light-emitting diodes (OLEDs), especially blue OLEDs, are generally inefficient. In this work, we use an alcohol-soluble amphiphilic polymer, Poly[9, 9- bis[3- (ethyldimethylammoni o) propyl] 9′, 9′- dioctyl[2, 2′- bi- 9 H- fluorene] - 7, 7′- diyl bromide (1:2)] (PFN-Br), to modify the hole transport layer, which is deposited on the surface of Poly(9-vinyl carbazole) (PVK) layer for interface modification to achieve high efficient blue OLEDs based on the thermally activated delayed fluorescent (TADF) material 10-[4-(4,6-Diphenyl-1,3,5-triazin-2-yl)− 2-methylphenyl]-spiro[acridine-9(10 H),9’-[9 H]fluorene] (TTSA) as the emitter. It is shown that adding PFN-Br layer can reduce the defect density at the interface between PVK and the emission layer, then the exciton quenching of TTSA is reduced. After optimizing the thickness of PFN-Br layer, the maximum external quantum efficiency and current efficiency of the optimal OLED achieve 22% and 42 cd/A, respectively. To the best of our knowledge, these values are superior to the highest values reported for this material in the literature.
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