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(a) Electroluminescence of the black cathode PLEDs and the control device. Inset shows the device configuration of the black cathode PLEDs (M is either Al or Ag) and (b) contrast ratio of the black cathode PLEDs and the control device under different ambient illumination. The inset shows the current–voltage characteristics of the PLEDs.
Images of the atomic force microscopy on the (a) [Ca(acac)2] surface, (b) Al surface with [Ca(acac)2] underneath, and (c) the successive Ag surface. All the image size is square.
XPS core level spectra immediately taken from the Al clusters covered with Al after evaporation (labeled as original) and their evolution (labeled as 10 and ). Both the spectra labeled as original and have been vertically displaced for clarity.
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