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Original Article Open Access
Tunable surface plasmon-polariton resonance in organic light-emitting devices based on corrugated alloy electrodes
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Abstract
We report a feasible method to realize tunable surface plasmon-polariton (SPP) resonance in organic light-emitting devices (OLEDs) by employing corrugated Ag-Al alloy electrodes. The excited SPP resonance induced by the periodic corrugations can be precisely tuned based on the composition ratios of the Ag-Al alloy electrodes. With an appropriate composition ratio of the corrugated alloy electrode, the photons trapped in SPP modes are recovered and extracted effectively. The 25% increasement in luminance and 21% enhancement in current efficiency have been achieved by using the corrugated Ag-Al alloy electrodes in OLEDs. -
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References
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Figure 1.
Fabrication process of the periodic corrugations based on NIL. (a) Si template with 290 nm periodic corrugations. (b) PDMS was spin-coated on Si template. (c) Solidified PDMS film was peeled off. (d) The corrugations were transferred to PDMS template. (e) SU-8 was spin-coated on a pre-cleaned glass substrate. (f) Prepared PDMS template was placed on the SU-8 film. (g) NIL processes were applied. (h) The periodic corrugations were prepared on the substrate.
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Figure 2.
The AFM images of corrugations (a) prepared on glass substrate by NIL and (b) after deposition of ultrathin Au electrode. (c) and (d) are the height profiles of corrugations on the substrate and Au electrode, respectively. The periodic corrugations before and after deposition of Au film show consistent surface morphologies.
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Figure 3.
(a) Measured and (b) simulated absorption spectra of OLEDs based on Ag, Al, Au, Cu metal cathodes
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Figure 4.
(a) The normalized absorption spectra of OLEDs based on Ag cathode (black line), Al cathode (green line), Ag0.952Al0.048 alloy cathode (red line), Ag0.909Al0.091 alloy cathode (blue line), and Ag0.870Al0.130 alloy cathode (magenta line), respectively. (b) The angle-dependent absorption spectra of OLEDs based on Ag0.909Al0.091 alloy cathode. The inset in (a) shows the absorption spectra of OLEDs based on various cathodes without normalization.
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Figure 5.
EL performance of OLEDs based on Ag-Al alloy cathodes with and without corrugations. (a) Current density-voltage and (b) efficiency-current density-luminance features, and (c) normalized EL spectra of corrugated and planar OLEDs. (d) The angle-dependent EL spectra of the corrugated OLEDs under TM polarization. The inset in (a) shows the photos of corrugated OLEDs and planar OLEDs operated at 6 V.
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