TY - JOUR
T1 - Low-Threshold Exciton-Polariton Condensation via Fast Polariton Relaxation in Organic Microcavities
AU - Ishii, Tomohiro
AU - Miyata, Kiyoshi
AU - Mamada, Masashi
AU - Bencheikh, Fatima
AU - Mathevet, Fabrice Dominique
AU - Onda, Ken
AU - Kéna-Cohen, Stéphane
AU - Adachi, Chihaya
N1 - Funding Information:
This work was financially supported by JST ERATO Grant Number JPMJER1305, JSPS KAKENHI Grant Number 19H02790, 20K21227, JP17H06375, JP20H05106, JSPS Core to Core program, the Murata Science Foundation, and the Inamori Foundation. S.K.C. acknowledges support from the NSERC Discovery Grant Program and Canada Research Chairs. Part of this work was also supported by the CNRS (PICS N° 8085), France.
Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021
Y1 - 2021
N2 - In organic microcavities, a macroscopic condensate of exciton-polaritons can be formed at high-exciton polariton densities. The threshold for forming this condensate is proportional to the relaxation rate from initially excited excitons to these polaritons and the lifetime of the lowest energy polariton states. Although the influence of the lower polariton (LP) lifetime on the threshold has been studied, the relationship between the polariton relaxation rate and the threshold has not been fully explored. In this study, a room-temperature polariton condensate is demonstrated at a threshold pump fluence of 9.7 ± 0.1 µJ cm−2, in a microcavity containing 4,4″-bis((E)-4-(3,6-bis(2-ethylhexyl)-(9H-carbazol-9-yl))styryl)-1,1″-biphenyl (BSBCz-EH). By using a semiclassical model to describe the polariton kinetics, it is revealed that this low threshold results from the rapid relaxation rate from the dark exciton reservoir to the set of the LP states forming the condensate, with an effective rate Wep ≈ 2.0 × 10−5 cm3 s−1. These results show that accelerating polariton relaxation is possible and is an important factor for realizing low-threshold polariton condensates.
AB - In organic microcavities, a macroscopic condensate of exciton-polaritons can be formed at high-exciton polariton densities. The threshold for forming this condensate is proportional to the relaxation rate from initially excited excitons to these polaritons and the lifetime of the lowest energy polariton states. Although the influence of the lower polariton (LP) lifetime on the threshold has been studied, the relationship between the polariton relaxation rate and the threshold has not been fully explored. In this study, a room-temperature polariton condensate is demonstrated at a threshold pump fluence of 9.7 ± 0.1 µJ cm−2, in a microcavity containing 4,4″-bis((E)-4-(3,6-bis(2-ethylhexyl)-(9H-carbazol-9-yl))styryl)-1,1″-biphenyl (BSBCz-EH). By using a semiclassical model to describe the polariton kinetics, it is revealed that this low threshold results from the rapid relaxation rate from the dark exciton reservoir to the set of the LP states forming the condensate, with an effective rate Wep ≈ 2.0 × 10−5 cm3 s−1. These results show that accelerating polariton relaxation is possible and is an important factor for realizing low-threshold polariton condensates.
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U2 - 10.1002/adom.202102034
DO - 10.1002/adom.202102034
M3 - Article
AN - SCOPUS:85120081210
SN - 2195-1071
JO - Advanced Optical Materials
JF - Advanced Optical Materials
ER -