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Photon upconversion with directed emission

Karl Börjesson ; Per Rudquist (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Victor Gray (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Kasper Moth-Poulsen (Institutionen för kemi och kemiteknik, Polymerteknologi)
Nature Communications (2041-1723). Vol. 7 (2016), p. artikel nr 12689.
[Artikel, refereegranskad vetenskaplig]

Photon upconversion has the potential to increase the efficiency of single bandgap solar cells beyond the Shockley Queisser limit. Efficient light management is an important point in this context. Here we demonstrate that the direction of upconverted emission can be controlled in a reversible way, by embedding anthracene derivatives together with palladium porphyrin in a liquid crystalline matrix. The system is employed in a triplet-triplet annihilation photon upconversion scheme demonstrating controlled switching of directional anti Stokes emission. Using this approach an emission ratio of 0.37 between the axial and longitudinal emission directions and a directivity of 1.52 is achieved, reasonably close to the theoretical maximal value of 2 obtained from a perfectly oriented sample. The system can be switched for multiple cycles without any visible degradation and the speed of switching is only limited by the intrinsic rate of alignment of the liquid crystalline matrix.



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Denna post skapades 2016-10-18. Senast ändrad 2016-11-08.
CPL Pubid: 243554

 

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