Journal
DALTON TRANSACTIONS
Volume 44, Issue 32, Pages 14436-14443Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5dt02093j
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Funding
- National Basic Research Program of China [2015CB655000]
- National Natural Science Foundation of China [51173067, 91333201]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT101713018]
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To construct high-performance organoboron-based blue emitters for electroluminescent (EL) devices, two diboron complexes have been synthesized through the chelation of 2-(1-phenyl-1H-benzo[d]imidazole-2-yl)phenol or 2-(2-pyridyl)phenol ligands with both boron atoms of the 9,10-diboraanthracene group. These complexes exhibit bright blue emissions in solution and in solid films with fluorescence quantum yields over 0.42, which benefit from their bis-spiro structures. In addition, they possess high thermal decomposition (>410 degrees C) and glass transition (>163 degrees C) temperatures. Moreover, they are excellent ambipolar transporting materials with high and balanced mobilities (>10(-4) cm(2) V-1 s(-1)) for holes and electrons. Due to these excellent properties, the EL devices adopting these complexes as non-doped emitting layers emit blue light and exhibit low turn-on voltages (<3.2 V), high luminance (up to 9041 cd m(-2)), as well as high current (up to 7.01 cd A(-1)) and power efficiencies (up to 7.58 lm W-1). To the best of our knowledge, these devices are so far the brightest and most efficient blue devices based on four-coordinate organoboron emitters.
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