Photoinduced change of dielectric permittivity in molecular doped polymer layer

Heisuke Sakai, Hideyuki Murata, Motonobu Murakami, Kei Ohkubo, Shunichi Fukuzumi

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We demonstrate a large photoinduced change of dielectric permittivity due to the charge separated (CS) state of an electron donor-acceptor linked molecule, 6- [4′ -(N,N -diphenylamino)phenyl]-3-ethoxycarbonylcoumarin (DPA-CM), doped in a polymethylmethacryrate (PMMA) matrix. Dielectric permittivity of DPA-CM in PMMA film increases from 4.1 to 7.5 under photoirradiation. Electron spin resonance spectra of the films measured under photoirradiation clearly show the formation of the CS state of DPA-CM in PMMA matrix. The origin of the photoinduced change of the dielectric permittivity is ascribed to the realignment of dipole of the CS state of DPA-CM.

Original languageEnglish
Article number252901
JournalApplied Physics Letters
Issue number25
StatePublished - 2009

Bibliographical note

Funding Information:
This work was partially supported by a Grant-in-Aid (Grant Nos. 1920509 and 19750034) and Scientific Research on Innovative Areas (“pi-Space”) (Grant Nos. 20108012 and 21750146) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan, a Seeds Innovation program “Practicability Verification Stage” from Japan Science and Technology Agency (JST), and KOSEF/MEST through WCU project (Grant No. R31-2008-000-10010-0). H.S. and M.M. gratefully acknowledge financial support by Research Fellowships of the Japan Society for the Promotion of Science (JSPS) for Young Scientists (doctoral course). M.M. expresses his special thanks for The Global COE (center of excellence) program “Global Education and Research Center for Bio-Environmental Chemistry” of Osaka University.


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