Universität zu Köln

Le Roux, Florian ORCID: 0000-0002-5473-5972, Mischok, Andreas ORCID: 0000-0003-4725-7404, Bradley, Donal D. C. and Gather, Malte C. (2022). Efficient Anisotropic Polariton Lasing Using Molecular Conformation and Orientation in Organic Microcavities. Adv. Funct. Mater., 32 (46). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1616-3028

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Abstract

Organic exciton-photon polariton lasers are promising candidates for the efficient generation of coherent light at room temperature. While their thresholds are now comparable with those of conventional organic photon lasers, tuning of molecular conformation and orientation as a means to control fundamental properties of their emission and thus further enhance performance remains largely unexplored. Here, a two-fold reduction in the threshold of a microcavity polariton laser based on an active layer of poly(9,9-dioctylfluorene) (PFO) is achieved when 15% beta-phase conformation is introduced. In addtion, taking advantage of the liquid crystalline properties of PFO, a thin photoalignment layer is used to induce nematic alignment of the polymer chains. The resulting transition dipole moment orientation increases the Rabi energy, bringing the system into the ultra-strong coupling regime and facilitating anisotropic polariton lasing with an eight-fold reduction in absorbed threshold, down to 1.14 pJ (0.36 mu J cm(-2)) for the direction parallel to the orientation, with no emission along the orthogonal direction. This represents the first demonstration of anisotropic polariton lasing in conjugated polymer microcavities and a lower threshold than current organic vertical cavity surface-emitting photon and polariton lasers. Dipole orientation offers new opportunities for switchable, more efficient polaritonic devices, and observation of fundamental effects at low polariton numbers.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Le Roux, Florian UNSPECIFIED orcid.org/0000-0002-5473-5972 UNSPECIFIED Mischok, Andreas UNSPECIFIED orcid.org/0000-0003-4725-7404 UNSPECIFIED Bradley, Donal D. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gather, Malte C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-672522
DOI:	10.1002/adfm.202209241
Journal or Publication Title:	Adv. Funct. Mater.
Volume:	32
Number:	46
Date:	2022
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1616-3028
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OPTICAL GAIN; BETA-PHASE; FILMS; FABRICATION; TRANSITION; SCATTERING; ENERGY Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67252