Organic Radicals Outperform LiF as Efficient Electron-Injection
Materials for Organic Light-Emitting Diodes
Version 4 2018-02-09, 18:51
Version 3 2017-10-17, 13:37
Version 2 2017-09-19, 13:04
Version 1 2017-09-19, 13:03
Posted on 2018-02-09 - 18:51
One
of the key issues for organic light-emitting diodes (OLEDs)
is to achieve high electroluminescence efficiency and high power efficiency,
which requires extremely efficient electron injection and thus low
driving voltage. Here, we design a series of precursors for reactive
organic radicals according to theoretical calculations and achieve
efficient electron injection by using a highly reducing radical on
the surface of the electron injection layer to reduce the electron
injection barrier through an interface charge-transfer process. In
contrast to bulk charge transfer in electron-transporting material,
interface charge transfer allows us to make efficient electron injection
at contact without introducing any structural and electronic disorder
to electron-transporting material. 2-(2,4,6-Trimethoxyphenyl)-1,3-dimethyl-1H-benzoimidazol-3-ium
(R3), with the strongest electron-donating ability, could largely
reduce the electron injection barrier and outperform the previously
reported organic radical (2-(2-methoxyphenyl)-1,3-dimethyl-1H-benzoimidazol-3-ium, o-MeO–DMBI or R1) and the widely used electron injection
material (LiF) to boost device performance.
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Bin, Zhengyang; Liu, Ziyang; Duan, Lian (2017). Organic Radicals Outperform LiF as Efficient Electron-Injection
Materials for Organic Light-Emitting Diodes. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.7b02125
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AUTHORS (3)
ZB
Zhengyang Bin
ZL
Ziyang Liu
LD
Lian Duan
KEYWORDS
electron-transporting materialelectron injection barrierinterface charge transferOLEDelectron injection layerinterface charge-transfer processOrganic Radicals Outperform LiFbulk charge transferelectron injectionEfficient Electron-Injection Materialselectron injection materialOrganic Light-Emitting Diodes