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A variety of N‐hydrogenated/N‐methylated pyridinium salts are elaborately designed and synthesized. Thermogravimetric and X‐ray photoelectron spectra analysis indicate the intensities of the NH covalent bonds are strengthened step‐by‐step from 3,3′‐(5′‐(3‐(pyridin‐3‐yl)phenyl)‐[1,1′:3′,1″‐terphenyl]‐3,3″‐diyl)dipyridine (Tm)‐HCl to Tm‐HBr and then Tm‐TfOH, which results in gradually improved cathode...
In article number 1700695, a self‐doping cathode interfacial layer (CIL) of Tm‐TfOH screened from a variety of pyridinium salts is reported by Lei Wang, Chuluo Yang, and co‐workers, which enables both high electron mobility and powerful work functions tunability simultaneously. The resulting light‐emitting diodes achieve a very low driving voltage of 2.9 V at 1000 cd m−2, and high external quantum...
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