Electronic structures and electron-injection mechanisms of cesium-carbonate-incorporated cathode structures for organic light-emitting devices
Journal
Applied Physics Letters
Journal Volume
88
Journal Issue
15
Pages
152104
Date Issued
2006-04
Author(s)
Abstract
In this letter, we investigate electronic structures and electron-injection mechanisms of the effective cathode structures for organic light-emitting devices incorporating cesium carbonate (Cs2 C O3), either deposited as an individual thin injection layer or doped into the organic electron-transport layers. The electronic structures and the interface chemistry studied by ultraviolet and x-ray photoemission spectroscopy show that the enhanced electron injection is associated with strong n -doping effects and increase of electron concentrations in the electron-transport layer induced by Cs2 C O3. Since such a reaction occurs without the presence of metals, cathode structures incorporating Cs2 C O3 may be applied to a wide range of electrode materials. © 2006 American Institute of Physics.
Other Subjects
Carbonates; Cathodes; Cesium alloys; Light emitting diodes; Semiconductor doping; X ray photoelectron spectroscopy; Cathode structures; Cesium-carbonate-incorporated cathode; Electron injection; Electronic structure
Type
journal article