Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantum Effects: QED I

Q 51.7: Vortrag

Donnerstag, 3. März 2016, 12:30–12:45, f442

Optimisation of energy transfer processes to increase upconversion luminescence in multi-layered photonic structures — •Fabian Spallek, Andreas Buchleitner, and Thomas Wellens — Institute of Physics, University of Freiburg, Germany

Upconversion materials, which convert two low-energy photons into one photon with higher energy, in combination with photonic structures give promising possibilities to improve the efficiency of silicon solar cells by utilising the full range of the solar spectrum [1]. We analyse the influence of photonic structures on energy transfer processes between active charged centers within the upconverter material. Using the framework of macroscopic quantum electrodynamics, the dependence of energy transfer rates can be derived in the presence of arbitrarily shaped dispersing and absorbing material bodies [2]. We calculate the relevant energy transfer rates for multi-layered photonic structures with the goal to optimise the energy transfer properties for the upconversion process.

[1] B. Herter, S. Wolf, S. Fischer, J. Gutmann, B. Blasi, and J.C. Goldschmidt, Increased upconversion quantum yield in photonic structures due to local field enhancement and modification of the local density of states - a simulation-based analysis, Opt. Express 21, A883 (2013)

[2] H.T. Dung, L. Knöll, and D.-G. Welsch, Intermolecular energy transfer in the presence of dispersing and absorbing media, Phys. Rev. A 65, 043813 (2002)