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Alcohol‐Processable Organic Amorphous Electrolytes as an Effective Electron‐Injection Layer for Organic Light‐Emitting Diodes
Author(s) -
Liu Gang,
Li YanHu,
Tan WanYi,
He ZhiCai,
Wang XiaoTie,
Zhang Chi,
Mo YueQi,
Zhu XuHui,
Peng Junbiao,
Cao Yong
Publication year - 2012
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201200299
Subject(s) - moiety , electrolyte , materials science , oled , amorphous solid , tetrafluoroborate , diode , electroluminescence , alkyl , solubility , layer (electronics) , chemical engineering , chemistry , organic chemistry , optoelectronics , ionic liquid , electrode , nanotechnology , engineering , catalysis
A new series of monoammonium‐based organic electrolytes with the tetrafluoroborate (BF 4 − ) counteranion have been synthesized. Replacing the pendant ethyl groups in the fluorenyl unit with 4‐ethoxyphenyl groups dramatically improves both solubility and morphological stability. The characterization of the alcohol‐processable amorphous ionic compounds as an electron‐injection layer in organic light‐emitting diodes (OLEDs) reveals that the organic electrolyte that comprises a rigid linear‐conjugated unit provides better device performance, with respect to its counterpart containing a branched bulky moiety. The capability of these compounds to facilitate electron injection from air‐stable aluminum metal is preliminarily discussed on the basis of the investigations of the electron‐only devices and photovoltaic experiments.