Imaging the polariton relaxation bottleneck in strongly coupled organic semiconductor microcavities

David M. Coles, Richard T. Grant, David G. Lidzey, Caspar Clark, Pavlos G. Lagoudakis

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We use angular-resolved photoluminescence excitation spectroscopy to probe energy relaxation towards the lowest lying states (k â̂¥=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 kâ̂¥=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 â̂¥=0, constituting an effective relaxation bottleneck.

Original languageEnglish
Article number121303
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number12
DOIs
Publication statusPublished - 30 Sep 2013
Externally publishedYes

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