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Imaging the polariton relaxation bottleneck in strongly coupled organic semiconductor microcavities

Imaging the polariton relaxation bottleneck in strongly coupled organic semiconductor microcavities
Imaging the polariton relaxation bottleneck in strongly coupled organic semiconductor microcavities
We use angular-resolved photoluminescence excitation spectroscopy to probe energy relaxation towards the lowest lying states (k∥=0) on the lower polariton branch (LPB) of two different strong-coupled J-aggregate organic semiconductor microcavities. We find that states along the upper polariton branch (UPB) are able to undergo efficient relaxation to populate states around k∥=0 on the LPB; a process that occurs through the rapid relaxation of UPB polaritons to the exciton reservoir. In contrast, LPB states having a photon fraction >0.5 are not apparently able to undergo further relaxation towards k∥=0, constituting an effective relaxation bottleneck.
1098-0121
Coles, David M.
767b66af-227f-4bd0-a99e-d4ae77cf5106
Grant, Richard T.
f020d9f6-b6b6-4ed6-8291-0c93f6dd4121
Lidzey, David G.
4c1f0189-29db-482f-896b-b90f28909baf
Clark, Caspar
4e14f0f1-6c89-4919-b86c-f3d1a551b518
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf
Coles, David M.
767b66af-227f-4bd0-a99e-d4ae77cf5106
Grant, Richard T.
f020d9f6-b6b6-4ed6-8291-0c93f6dd4121
Lidzey, David G.
4c1f0189-29db-482f-896b-b90f28909baf
Clark, Caspar
4e14f0f1-6c89-4919-b86c-f3d1a551b518
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf

Coles, David M., Grant, Richard T., Lidzey, David G., Clark, Caspar and Lagoudakis, Pavlos G. (2013) Imaging the polariton relaxation bottleneck in strongly coupled organic semiconductor microcavities. Physical Review B, 88 (12), [121303(R)]. (doi:10.1103/PhysRevB.88.121303).

Record type: Article

Abstract

We use angular-resolved photoluminescence excitation spectroscopy to probe energy relaxation towards the lowest lying states (k∥=0) on the lower polariton branch (LPB) of two different strong-coupled J-aggregate organic semiconductor microcavities. We find that states along the upper polariton branch (UPB) are able to undergo efficient relaxation to populate states around k∥=0 on the LPB; a process that occurs through the rapid relaxation of UPB polaritons to the exciton reservoir. In contrast, LPB states having a photon fraction >0.5 are not apparently able to undergo further relaxation towards k∥=0, constituting an effective relaxation bottleneck.

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Published date: 30 September 2013

Identifiers

Local EPrints ID: 430554
URI: http://eprints.soton.ac.uk/id/eprint/430554
ISSN: 1098-0121
PURE UUID: 4d02fe8f-13b0-458b-97e8-36c279c53db8

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Date deposited: 03 May 2019 16:30
Last modified: 03 May 2019 16:30

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