[structure: see text] Novel solution-processable blue light-emitting materials Blue A-D, bearing a polyphenylphenyl dendron, have been synthesized and characterized. The energy levels and band gaps can be facilely tuned by changing the central aromatic ring of the molecules. A highly efficient deep blue light-emitting OLED device based on Blue C with a maximum current efficiency of 2.2 cd/A has been achieved using PVK as the host material through a solution process.
Synthesis and characterization of the four blue light emitting materials 2-(Trimethylsilyl)ethynyl-5-bromopyridine (2A)To a solution of 2,5-dibromopyridine (3.56 g, 0.015 mol), CuI (0.07 g, 0.37 mmol), and Pd(PPh 3 ) 2 Cl 2 (0.26 g, 0.37 mmol) in 100 ml of diisopropylamine was added (trimethylsilyl)acetylene (1.47 g, 0.015 mol). The mixture was stirred at room temperature overnight under nitrogen atmosphere. After removal of the solvent under reduce pressure, the residue was purified by flash column to offer 3.45 g (yield 90%) of 2-(trimethylsilyl)ethynyl-5-bromopyridine. MS: m/z 252.8 (47%), 254.8 (47%). 1 H NMR (ppm) (400 MHz, CDCl 3 )
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