Abstract
Two new star-shaped oligofluorenes, HFB-diF-Dpa and HFB-terF-Dpa, with a hexakis(fluoren-2-yl)benzene core and six diphenylamine end-cappers were designed and synthesized. The peripheral diphenylamine groups enhance the HOMO energy levels of the materials, and the bulky star-shaped structures efficiently suppress the intermolecular interaction. Their thermal, photophysical, and electrochemical properties were investigated. The two compounds display strong deep-blue emission both in solution and solid state. Solution-processed devices based on these starbursts exhibit highly efficient and stable deep-blue electroluminescence. Their high-lying HOMO energy levels match very well with that of the hole-injecting material. The double-layered device featuring HFB-diF-Dpa as emitter shows a low turn-on voltage of 3.6 V, a maximum current efficiency of 6.99 cd A–1, and a maximum external quantum efficiency of 5.45% with the CIE coordinate of (0.154, 0.136). In particular, the combination of low driving voltage and...
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