TY - JOUR
T1 - Exciton-exciton annihilation in organic polariton microcavities
AU - Akselrod, G. M.
AU - Tischler, Y. R.
AU - Young, E. R.
AU - Nocera, D. G.
AU - Bulovic, V.
PY - 2010/9/27
Y1 - 2010/9/27
N2 - We investigate the incoherent diffusion of excitons in thin films (5.1±0.1nm thick) of a highly absorbing J-aggregated cyanine dye material (106 cm-1 absorption constant) as the excitonic component of a polariton microcavity. Under high-intensity pulsed laser excitation, the J-aggregated molecular films exhibit significant exciton-exciton annihilation, indicating a large exciton diffusion radius of more than 100 nm. When the material is strongly coupled to a cavity, the polaritonic structure also shows exciton-exciton annihilation, which is a competing process against the establishment of a threshold population of polaritons needed for polariton lasing. This study suggests that exciton-exciton annihilation is a loss process which can significantly increase the lasing threshold in polariton microcavities.
AB - We investigate the incoherent diffusion of excitons in thin films (5.1±0.1nm thick) of a highly absorbing J-aggregated cyanine dye material (106 cm-1 absorption constant) as the excitonic component of a polariton microcavity. Under high-intensity pulsed laser excitation, the J-aggregated molecular films exhibit significant exciton-exciton annihilation, indicating a large exciton diffusion radius of more than 100 nm. When the material is strongly coupled to a cavity, the polaritonic structure also shows exciton-exciton annihilation, which is a competing process against the establishment of a threshold population of polaritons needed for polariton lasing. This study suggests that exciton-exciton annihilation is a loss process which can significantly increase the lasing threshold in polariton microcavities.
UR - http://www.scopus.com/inward/record.url?scp=77957551492&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.82.113106
DO - 10.1103/PhysRevB.82.113106
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AN - SCOPUS:77957551492
SN - 1098-0121
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 11
M1 - 113106
ER -