Reactivity of low-workfunction

The Reactivity of Low-Workfunction Metals on Conjugated Polymer Surfaces A Photoelectron Spectroscopy Study... 

Our approach to the color-variable LEDs presented here has a number of important advantages (1) The two redox polymers modify the charge-inj ection properties of the polymer/metal interfaces, allowing the use of high-workfunction metals as electrodes. This potentially reduces the aging problems associated with conventional polymer LEDs, which must use reactive low-workfunction metals to... 

As presented in the Introduction, one major aspect of conjugated polymer-based LEDs is the presence of interfaces between the metal electrodes and the active polymer layer. In particular, the electron-injecting contact is made of a metal with a low workfunction such as aluminum. As this metal is known to be reactive, it is important to determine to which extent the phenomena occurring at the interface with the polymer can affect the geometric and electronic structure of the 7r-conjugated system and how the interface interactions can influence the operation of the device. 

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