High-performance red-inverted polymer light emitting diodes enhanced via coupled-Au NPs induced local surface plasmon resonance

Abstract The surface plasmons of coupled-Au NPs can improve the performance of solution-processed red-inverted polymer light-emitting diodes (iPLEDs) when the blends of poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV): (poly(2-(4-(3′,7′-dimethyloctyloxyphenyl)-1,4-phenylene-vinylene (P-PPV) is applied as the active layer, which exhibited the improved brightness from 2006 to 4025 cd m−2 (1.0-fold enhancement), the enhanced luminous efficiency from 0.82 to 1.82 cd A−1 (1.2-fold enhancement), and the increased power efficiency from 0.20 to 0.44 lm·W−1 (1.2-fold enhancement). The experimental results show that it is mainly attributed to the original surface plasmon resonance (SPR) band in the short wavelength that enhance the forster resonance energy transfer efficiency from P-PPV to MEH-PPV, and the new SPR band in the long wavelength that improve the blends polymer fluorescence emission. The results demonstrate that the coupled-Au NPs pave an effective route to achieve high performance red-based inverted polymer light-emitting diodes, which expand the spectra range based on the SPR effect of Au NPs.