3 years ago

Emission dynamics of hybrid plasmonic gold/organic GaN nanorods.

Gerd Duscher, Wolfgang Langbein, Gerd Kunert, Jingxuan Ge, Detlef Hommel, Fatemesadat Mohammadi, Hans-Peter Wagner, Heidrun Schmitzer
We studied the emission of bare and aluminum quinoline (Alq3)/gold coated wurtzite GaN nanorods by temperature- and intensity-dependent time-integrated and time-resolved photoluminescence (PL). The GaN nanorods of ~1.5 μm length and ~250 nm diameter were grown by plasma-assisted molecular beam epitaxy. Gold/Alq3 coated GaN nanorods were synthesized by organic molecular beam deposition. The near band-edge and donor-acceptor pair luminescence was investigated in bare GaN nanorods and compared with multilevel model calculations providing the dynamical parameters for electron-hole pairs, excitons, impurity bound excitons, donors and acceptors. Subsequently, the influence of a 10 nm gold coating without and with an Alq3 spacer layer was studied and the experimental results were analyzed with the multilevel model. Without spacer layer a significant PL quenching and lifetime reduction of the near band-edge emission is found. The behaviour is attributed to surface band-bending and Förster energy transfer from excitons to surface plasmons in the gold layer. Inserting a 5 nm Alq3 spacer layer reduces the PL quenching and lifetime reduction which is consistent with a reduced band-bending and Förster energy transfer. Increasing the spacer layer to 30 nm results in lifetimes which are similar to uncoated structures, showing a significantly decreased influence of the gold coating on the excitonic dynamics.

Publisher URL: http://doi.org/10.1088/1361-6528/aa95a3

DOI: 10.1088/1361-6528/aa95a3

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