TY - JOUR
T1 - Pressure-induced delocalization of photoexcited states in a semiconducting polymer
AU - Albert-Seifried, Sebastian
AU - Hodgkiss, Justin M.
AU - Laquai, Frédéric
AU - Bronstein, Hugo A.
AU - Williams, Charlotte K.
AU - Friend, Richard H.
PY - 2010/11/2
Y1 - 2010/11/2
N2 - We present broadband transient absorption spectroscopy on the fluorescent copolymer poly(9,9-dioctylfluorene-co-benzothiadiazole) under hydrostatic pressure of up to 75 kbar. We observe a strong reduction of the stimulated emission intensity under pressure, coupled with slower decay kinetics and reduced fluorescence intensity. These observations indicate increased delocalization of photogenerated singlet excitons, facilitated by an increased dielectric constant at high pressure. Spin triplet excitons, generated via an iridium complex-F8BT oligomer, show reduced lifetimes under pressure.
AB - We present broadband transient absorption spectroscopy on the fluorescent copolymer poly(9,9-dioctylfluorene-co-benzothiadiazole) under hydrostatic pressure of up to 75 kbar. We observe a strong reduction of the stimulated emission intensity under pressure, coupled with slower decay kinetics and reduced fluorescence intensity. These observations indicate increased delocalization of photogenerated singlet excitons, facilitated by an increased dielectric constant at high pressure. Spin triplet excitons, generated via an iridium complex-F8BT oligomer, show reduced lifetimes under pressure.
UR - http://www.scopus.com/inward/record.url?scp=78149311800&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.105.195501
DO - 10.1103/PhysRevLett.105.195501
M3 - Article
C2 - 21231181
AN - SCOPUS:78149311800
SN - 0031-9007
VL - 105
JO - Physical Review Letters
JF - Physical Review Letters
IS - 19
M1 - 195501
ER -