Mechanical study of the enhanced electron injection via using a Bphen interlayer at Alq3/Cs2CO3 interface

Jiarong Lian; Changxiao Pan; Shenxun Su; Ruiyou Liu; Pengju Zeng

doi:10.1117/12.928166

13 September 2012 Mechanical study of the enhanced electron injection via using a Bphen interlayer at Alq₃/Cs₂CO₃ interface

Jiarong Lian, Changxiao Pan, Shenxun Su, Ruiyou Liu, Pengju Zeng

Author Affiliations +

Proceedings Volume 8476, Organic Light Emitting Materials and Devices XVI; 84761P (2012) https://doi.org/10.1117/12.928166
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

Abstract

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.

Citation Download Citation

Jiarong Lian, Changxiao Pan, Shenxun Su, Ruiyou Liu, and Pengju Zeng "Mechanical study of the enhanced electron injection via using a Bphen interlayer at Alq₃/Cs₂CO₃ interface", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 84761P (13 September 2012); https://doi.org/10.1117/12.928166

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