Efficient Anisotropic Polariton Lasing Using Molecular Conformation and Orientation in Organic Microcavities

Florian Le Roux; Andreas Mischok; Donal D. C. BradleyMalte C. Gather

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Efficient Anisotropic Polariton Lasing Using Molecular Conformation and Orientation in Organic Microcavities

机译：Efficient Anisotropic Polariton Lasing Using Molecular Conformation and Orientation in Organic Microcavities

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Organic exciton-photon polariton lasers are promising candidates for theefficient generation of coherent light at room temperature. While their thresholdsare now comparable with those of conventional organic photon lasers,tuning of molecular conformation and orientation as a means to control fundamentalproperties of their emission and thus further enhance performanceremains largely unexplored. Here, a two-fold reduction in the threshold ofa microcavity polariton laser based on an active layer of poly(9,9-dioctylfluorene)(PFO) is achieved when 15% β-phase conformation is introduced. Inaddtion, taking advantage of the liquid crystalline properties of PFO, a thinphotoalignment layer is used to induce nematic alignment of the polymerchains. The resulting transition dipole moment orientation increases the Rabienergy, bringing the system into the ultra-strong coupling regime and facilitatinganisotropic polariton lasing with an eight-fold reduction in absorbedthreshold, down to 1.14 pJ (0.36 μJ cm~（?2）) for the direction parallel to theorientation, with no emission along the orthogonal direction. This representsthe first demonstration of anisotropic polariton lasing in conjugated polymermicrocavities and a lower threshold than current organic vertical cavitysurface-emitting photon and polariton lasers. Dipole orientation offers newopportunities for switchable, more efficient polaritonic devices, and observationof fundamental effects at low polariton numbers.

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《Advanced functional materials》 |2022年第46期|2209241.1-2209241.10|共10页
作者
Florian Le Roux; Andreas Mischok; Donal D. C. BradleyMalte C. Gather;
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作者单位

Humboldt Centre for Nano- and BiophotonicsDepartment of ChemistryUniversity of CologneGreinstr. 4–6, 50939 Koeln, Germany;

Physical Science and Engineering DivisionKing Abdullah University of Science and Technology (KAUST)Thuwal 23955–6900, Saudi Arabia;

Organic Semiconductor CentreSUPA School of Physics and AstronomyUniversity of St AndrewsSt Andrews KY16 9SS, UK;

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正文语种英语
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exciton-polaritons; liquid crystalline conjugated polymers; molecular conformation; molecular orientation; organic semiconductors; polariton lasing;

Efficient Anisotropic Polariton Lasing Using Molecular Conformation and Orientation in Organic Microcavities

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