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  • 2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference
  • (Optica Publishing Group, 2017),
  • paper CK_P_9

Photon Management in Organic Light-Emitting Diodes with Multilayered Plasmonic Nanostars

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Here we report on promising strategies for photon management in organic optolectronic devices. Multilayered hybrid plasmonic nanostars are used to boost the performance of organic light-emitting diodes (OLEDs). We designed and synthesized silver-enhanced gold nanostars coated with a very thin silica layer (~10 nm), so that the hot-spots at the tips of the nanostars remain easily accessible, while the emission quenching is reduced. The spectral position of the plasmon resonances is tuned in specific spectral regions for the optimal overlap with the emission of different organic semiconductors and dyes. We successfully incorporated the nanostars in the active layer of fully working OLEDs. For a given current density, the plasmonic OLEDs show both: significantly enhanced electroluminescence as well as substantially different emission directionality as compared to the conventional plain OLEDs. We find that the nanostars act as nanoantennas, thus accelerating the radiative recombination of excitons as well as improving the out-coupling of light otherwise trapped in the OLEDs [1]. Furthermore, we demonstrate that hybrid multilayered plasmonic nanostars can be universally used as feedback agents for coherent random lasing in polar or non-polar solutions containing gain material [2,3]. We show that the pumping threshold for coherent random lasing is reduced substantially upon silver-enhancement of gold nanostars. In addition, we reveal that neither pumping threshold nor the lasing intensity of random lasers based on silver-enhanced gold nanostars is influenced by silica coating, in contrast to gold nanostar-based random lasers, where silica coated gold nanostars support only amplified spontaneous emission but no coherent random lasing.

© 2017 IEEE

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