Electron Injection Mechanisms Varied by Conjugated Polyelectrolyte Electron Transporting Layers in Polymer Light-Emitting Diodes
نویسندگان
چکیده
منابع مشابه
Ion motion in conjugated polyelectrolyte electron transporting layers.
In organic light-emitting diodes (OLEDs), electrons are injected from the cathode into the π*-band (lowest unoccupied molecular orbital) of an organic semiconductor and holes are injected from the anode into the π-band (highest occupied molecular orbital). If the work function of the cathode is greater than the π*-band or the work function of the anode is less than the π-band, these differences...
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A new zwitterionic conjugated polyelectrolyte without free counterions has been used as an electron injection material in polymer light-emitting diodes. Both the efficiency and maximum brightness were considerably improved in comparison with standard Ca cathode devices. The devices showed very fast response times, indicating that the improved performance is, in addition to hole blocking, due to...
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Metal oxides as ZnO provide an interesting alternative for conventional low work function metals as electron injection layer in organic light-emitting diodes (OLEDs). However, for most state-of-the-art OLED materials the high work function of ZnO leads to a large injection barrier for electrons. As a result the electron current in the OLED is largely limited by the contact, leading to a strong ...
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The variation of current I with voltage V for poly(phenylene vinylene) and other polymer light-emitting diodes has been attributed to carriers tunneling into broad conduction and valence bands. In actuality the electrons and holes tunnel into polaron levels and transport is by hopping among these levels. We show that for small injection the I-V characteristic is determined mainly by the image f...
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ژورنال
عنوان ژورنال: Polymer Korea
سال: 2012
ISSN: 0379-153X
DOI: 10.7317/pk.2012.36.4.519