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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 3.0).

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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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