TY - JOUR
T1 - Temperature independent exciton relaxation in poly(di-n-hexylsilane) confined in nanoporous silica
AU - Kazlauskas, K.
AU - Dementjev, A.
AU - Gulbinas, V.
AU - Valkunas, L.
AU - Vitta, P.
AU - Žukauskas, A.
AU - Ostapenko, N.
AU - Suto, S.
N1 - Funding Information:
This research was partly supported by the Lithuanian State Science and Studies Foundation. The authors also express gratitude to Prof. A. Watanabe for synthesis of PDHS and Dr. G. Telbiz for preparation of the composite.
PY - 2008/11/13
Y1 - 2008/11/13
N2 - Exciton relaxation kinetics of poly(di-n-hexylsilane) (PDHS) confined within 10-nm size pores of silica matrix SBA-15 was investigated by frequency domain fluorometry in the 10-300 K temperature range. Temperature independent exciton lifetimes of 0.66 ns and 0.28 ns were determined for the PDHS in the aggregated form (up to 300 K) and in trans form (up to 200 K), respectively, indicating the constant luminescence quantum yield and the temperature insensitive nonradiative relaxation upon confinement of PDHS into nanopores. The absence of thermal activation of nonradiative decay is most likely caused by severely restricted exciton migration towards quenching centers in low-dimensional structures.
AB - Exciton relaxation kinetics of poly(di-n-hexylsilane) (PDHS) confined within 10-nm size pores of silica matrix SBA-15 was investigated by frequency domain fluorometry in the 10-300 K temperature range. Temperature independent exciton lifetimes of 0.66 ns and 0.28 ns were determined for the PDHS in the aggregated form (up to 300 K) and in trans form (up to 200 K), respectively, indicating the constant luminescence quantum yield and the temperature insensitive nonradiative relaxation upon confinement of PDHS into nanopores. The absence of thermal activation of nonradiative decay is most likely caused by severely restricted exciton migration towards quenching centers in low-dimensional structures.
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U2 - 10.1016/j.cplett.2008.09.065
DO - 10.1016/j.cplett.2008.09.065
M3 - Article
AN - SCOPUS:55549126246
SN - 0009-2614
VL - 465
SP - 261
EP - 264
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 4-6
ER -