Cs2CO3 is shown as a good electron injection material in organic electronic
devices for its strong electron injection ability and being insensitive to the choice of
metal cathode. Although it is hypothesized that the organic layer adjacent to the
Cs2CO3 is crucial to realize efficient electron injection, little work is carried out to
study the electron injection capability of cathode when Cs2CO3 contacts with different
organic materials.
Here a phenanthroline (Bphen) thin layer has been inserted at Alq3/Cs2CO3
interface to improve electron injection, and the responding mechanism is also studied.
When locating a 5 nm Bphen layer at Alq3/Cs2CO3 interface, OLEDs performed much
larger current. A photovoltaic experimental was conducted to study the build-in
electrical field in OLEDs, which would give a hint for the work function change of
cathode when Bphen interlayer was used; and the ultraviolet-visible absorption
spectroscopy was also used to study the electronic structure change of Bphen when it
contacts with Cs2CO3. Our study suggest that the cathode work function does not
change obviously when Bphen interlayer is used, but much stronger charger transfer
takes place between Bphen and Cs2CO3 than that between Alq3 and Cs2CO3, so that a
stronger dipole and a lower electron injection barrier can be expected playing a role at
Bphen/Cs2CO3 interface.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.