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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S5 — Sep. 9, 2013
  • pp: A883–A900

Increased upconversion quantum yield in photonic structures due to local field enhancement and modification of the local density of states – a simulation-based analysis

Barbara Herter, Sebastian Wolf, Stefan Fischer, Johannes Gutmann, Benedikt Bläsi, and Jan Christoph Goldschmidt  »View Author Affiliations

Optics Express, Vol. 21, Issue S5, pp. A883-A900 (2013)

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In upconversion processes, two or more low-energy photons are converted into one higher-energy photon. Besides other applications, upconversion has the potential to decrease sub-band-gap losses in silicon solar cells. Unfortunately, upconverting materials known today show quantum yields, which are too low for this application. In order to improve the upconversion quantum yield, two parameters can be tuned using photonic structures: first, the irradiance can be increased within the structure. This is beneficial, as upconversion is a non-linear process. Second, the rates of the radiative transitions between ionic states within the upconverter material can be altered due to a varied local density of photonic states. In this paper, we present a theoretical model of the impact of a photonic structure on upconversion and test this model in a simulation based analysis of the upconverter material β -NaYF4:20% Er3+ within a dielectric waveguide structure. The simulation combines a finite-difference time-domain simulation model that describes the variations of the irradiance and the change of the local density of photonic states within a photonic structure, with a rate equation model of the upconversion processes. We find that averaged over the investigated structure the upconversion luminescence is increased by a factor of 3.3, and the upconversion quantum yield can be improved in average by a factor of 1.8 compared to the case without the structure for an initial irradiance of 200 Wm−2.

© 2013 OSA

OCIS Codes
(190.7220) Nonlinear optics : Upconversion
(350.2770) Other areas of optics : Gratings
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(130.5296) Integrated optics : Photonic crystal waveguides

ToC Category:
Photonic Crystals

Original Manuscript: June 18, 2013
Revised Manuscript: July 21, 2013
Manuscript Accepted: July 21, 2013
Published: August 28, 2013

Barbara Herter, Sebastian Wolf, Stefan Fischer, Johannes Gutmann, Benedikt Bläsi, and Jan Christoph 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-A900 (2013)

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