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The optical transmission spectra, , of the OLED metallic electrodes; (a) 80-nm-thick Al cathode, and (b) 70-nm-thick Au anode. In (a) we compare of the perforated Al electrode in the form of metallic dielectric photonic crystal—MDPC as shown in the inset, to that of an unperforated Al film. The anomalous transmission bands are assigned to the SPP excitations at the air-Al (A) or glass-Al (G) interfaces by vertical full lines and dashed lines, respectively.
The PL spectra of a MEH-PPV polymer film spin coated on the unperforated Al (full line), and perforated Al electrodes, which are measured in reflection geometry (dashed line), and transmission geometry through the film (dotted-dashed line). The inset shows the MEH-PPV polymer repeat unit.
Color online. (a) The inverted OLED configuration that consists of three layers: an Al cathode coated with a thin Ba film for enhanced electron injecting, the active MEH-PPV polymer layer, capped by a gold anode. The OLED device operates at forward bias, . (b) The characteristics of the two OLEDs; dashed (full) line is for the device based on the perforated (unperforated) Al cathode. (c) The EL quantum efficiency of the two OLEDs measured as a function of the current density, dashed and full lines as in (b).
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