Abstract
In this paper, we report on polymer light-emitting devices based on the mixture of a common luminescent polymer and a lithium salt. The sandwich polymer/salt devices with aluminum electrodes are poor emitters as constructed, but undergo a unique turn on process when a large voltage bias is applied at room temperature. Once activated, the devices exhibit vastly improved electroluminescence and prompt response to applied voltage. Moreover, the devices exhibit a luminance shelf life of approx. 150 h when stored at room temperature without bias. We show detailed device characteristics and discuss possible operating mechanisms for such devices. We also discuss the implication of such devices with regard to room-temperature frozen-junction devices.
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