TY - JOUR
T1 - Exciton-exciton scattering in disordered linear chains of poly(di-(formula presented)-hexylsilane)
AU - Shimizu, Makoto
AU - Suto, Shozo
AU - Yamamoto, Aishi
AU - Goto, Takenari
AU - Kasuya, Atsuo
AU - Watanabe, Akira
AU - Matsuda, Minoru
PY - 2001
Y1 - 2001
N2 - We have measured the time response of photoluminescence intensity in poly(di-(formula presented)-hexylsilane) films at 2 K with excitation densities from (formula presented) to (formula presented) excitons (formula presented) At the highest density, the photoluminescence has a rise time of 1.4 ps, which is ascribed to the exciton-exciton scattering time between initially photogenerated excitons. The inverse of rise times are sublinear to the excitation densities. The decay profiles are explained by the exciton-exciton annihilation with a rate constant of (formula presented) These processes are discussed in terms of exciton wave functions obtained by the one-dimensional Frenkel exciton model with disorder. We propose directional relaxation of excitons toward interacting points between different polymer chains as a mechanism for the efficient exciton-exciton annihilation.
AB - We have measured the time response of photoluminescence intensity in poly(di-(formula presented)-hexylsilane) films at 2 K with excitation densities from (formula presented) to (formula presented) excitons (formula presented) At the highest density, the photoluminescence has a rise time of 1.4 ps, which is ascribed to the exciton-exciton scattering time between initially photogenerated excitons. The inverse of rise times are sublinear to the excitation densities. The decay profiles are explained by the exciton-exciton annihilation with a rate constant of (formula presented) These processes are discussed in terms of exciton wave functions obtained by the one-dimensional Frenkel exciton model with disorder. We propose directional relaxation of excitons toward interacting points between different polymer chains as a mechanism for the efficient exciton-exciton annihilation.
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U2 - 10.1103/PhysRevB.64.115417
DO - 10.1103/PhysRevB.64.115417
M3 - Article
AN - SCOPUS:85038268314
SN - 1098-0121
VL - 64
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 11
ER -