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Efficiency scaling of non-coherent upconversion in a one-dimensional model system

Author(s): Zimmermann, Jochen; Buchleitner, Andreas; Scholes, Gregory D.; Zimmermann, Jochen; Mulet, Roberto; et al

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Abstract: A very promising approach to obtain efficient upconversion of light is the use of triplet-triplet annihilation of excitations in molecular systems. In real materials, besides upconversion, many other physical processes take place - fluorescence, phosphorescence, non-radiative decay, annihilation, diffusion - and compete with upconversion. The main objective of this work is to design a proof of principle model that can be used to shed light on the interplay between these processes. Ultimately, we want to establish general principles that may guide experimentalists toward the design of solid state materials with maximum efficiency. Here we show, in a one-dimensional model system, that upconversion can be optimized by varying the ratio between the two molecular species used in triplet-triplet-annihilation based upconversion systems, even in the presence of undesired losses through phosphorescence, non-radiative decay, or annihilation. We derive scaling laws for this ratio and for the maximum efficiency of upconversion, as a function of the diffusion rate J, as well as of the creation and of the decay rate of the excitations. © 2013 American Institute of Physics.
Publication Date: 7-Apr-2013
Electronic Publication Date: 2-Apr-2013
Citation: Zimmermann, Jochen, Mulet, Roberto, Wellens, Thomas, Scholes, Gregory D., Buchleitner, Andreas. (2013). Efficiency scaling of non-coherent upconversion in a one-dimensional model system. The Journal of Chemical Physics, 138 (13), 134505 - 134505. doi:10.1063/1.4798406
DOI: doi:10.1063/1.4798406
ISSN: 0021-9606
EISSN: 1089-7690
Pages: 138.13:134505-1 - 134505-10
Type of Material: Journal Article
Journal/Proceeding Title: The Journal of Chemical Physics
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Journal of Chemical Physics. Volume 138, Issue 13, 7 April 2013, Article number 134505.

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