New fluorescent emitter for efficient deep-blue electroluminescence with unusual roll-up character

New deep-blue fluorophore NPAPPS has been synthesized. The compound has both high T-d of 452 degrees C and high T-g above 130 degrees C, indicative of excellent thermal stability. Photophysical measurements revealed the ICT characteristic both in the ground state and the excited state of NPAPSS, as well as its high Phi(f), 0.92 in cyclohexane and 0.71 in CH2Cl2. NPAPSS also has a bipolar nature reflected from the oxidation and reduction responses in CV tests. When used as an emitter in the non-doped electroluminescence device, NPAPPS exhibited an unusual roll-up character. At 20, 60, 100 mA cm(-2), the device gave efficient current efficiencies of 3.80, 3.97, 4.05 cd A(-1) respectively. This roll-up character suggests that NPAPSS is a practically favorable fluorescent emitter. (C) 2015 Elsevier B.V. All rights reserved.