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Crystals 2014, 4(2), 152-167; doi:10.3390/cryst4020152

Electric Field Effects on Photoluminescence of CdSe Nanoparticles in a PMMA Film

Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 001-0020, Japan Current address: Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
* Author to whom correspondence should be addressed.
Received: 8 April 2014 / Revised: 4 June 2014 / Accepted: 6 June 2014 / Published: 23 June 2014
(This article belongs to the Special Issue Semiconductor Nanocrystals)
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External electric field effects on spectra and decay of photoluminescence (PL) as well as on absorption spectra were measured for CdSe nanoparticles in a poly(methyl methacrylate) (PMMA) film. Electrophotoluminescence (E-PL) spectra as well as electroabsorption spectra show a remarkable Stark shift which depends on the particle size, indicating a large electric dipole moment in the first exciton state. The E-PL spectra also show that PL of CdSe is quenched by application of electric fields, and the magnitude of the field-induced quenching becomes larger with increasing size. The PL decay profiles observed in the absence and presence of electric field show that the field-induced quenching of PL mainly originates from the field-induced decrease in population of the emitting state prepared through the relaxation from the photoexcited state.
Keywords: CdSe; electric field effects; photoluminescence; field-induced quenching CdSe; electric field effects; photoluminescence; field-induced quenching
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nakabayashi, T.; Ohshima, R.; Ohta, N. Electric Field Effects on Photoluminescence of CdSe Nanoparticles in a PMMA Film. Crystals 2014, 4, 152-167.

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