TY - JOUR
T1 - Exciplex emission from amphiphilic polysilanes bearing ammonium moieties
AU - Yamaki, Tetsuya
AU - Nakashiba, Yukio
AU - Asai, Keisuke
AU - Ishigure, Kenkichi
AU - Seki, Shuhei
AU - Tagawa, Seiichi
AU - Shibata, Hiromi
N1 - Funding Information:
The authors would like to thank Mr M. Narui and Mr T. Omata at the Research Center for Nuclear Science and Technology, The University of Tokyo, for their technical support. This work was supported in part by a Grant-in-aid from the Ministry of Education, Science and Culture, Japan.
PY - 1997/9/1
Y1 - 1997/9/1
N2 - We were the first to observe two emission bands in the visible region for some kinds of ammonium-type amphiphilic polysilanes both in solutions and in thin films. One, a broad emission band at 400-500 nm not due to a σ * → σ transition, was observed only for methylphenylsilane-based polymer solutions. The appearance of this low-energy emission is reasonably explained by considering the intramolecular exciplex formation between a Si-conjugated main chain and an ammonium site in the same monomer unit. The other, an emission band at the longer wavelength (around 560 nm), was found in the solvent-cast films where each molecule is randomly located, in addition to that observed for the solutions. This emission, which was not observed for the oriented LB films, is considered to originate from an inter molecular interaction.
AB - We were the first to observe two emission bands in the visible region for some kinds of ammonium-type amphiphilic polysilanes both in solutions and in thin films. One, a broad emission band at 400-500 nm not due to a σ * → σ transition, was observed only for methylphenylsilane-based polymer solutions. The appearance of this low-energy emission is reasonably explained by considering the intramolecular exciplex formation between a Si-conjugated main chain and an ammonium site in the same monomer unit. The other, an emission band at the longer wavelength (around 560 nm), was found in the solvent-cast films where each molecule is randomly located, in addition to that observed for the solutions. This emission, which was not observed for the oriented LB films, is considered to originate from an inter molecular interaction.
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U2 - 10.1016/S0022-3115(97)00193-1
DO - 10.1016/S0022-3115(97)00193-1
M3 - Article
AN - SCOPUS:0031234196
SN - 0022-3115
VL - 248
SP - 369
EP - 373
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -