Photon upconversion with directed emission
Artikel i vetenskaplig tidskrift, 2016

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.


Karl Börjesson

Göteborgs universitet

Per Rudquist

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Victor Gray

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Kasper Moth-Poulsen

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 7 artikel nr 12689- 12689


Nanovetenskap och nanoteknik




Fysikalisk kemi

Atom- och molekylfysik och optik




Chalmers infrastruktur för masspektrometri

Chalmers materialanalyslaboratorium



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