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

Nakabayashi, Takakazu; Ohshima, Ruriko; Ohta, Nobuhiro

doi:10.3390/cryst4020152

Cited by 14 publications

(3 citation statements)

References 46 publications

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“…Therefore, the modulation of photoresponse could be attributed to the effects of light illumination and the lateral electric field that is simultaneously applied to the PCBM-doped BLMs. It has been reported that the photoluminescence and absorption of CdSe nanoparticles that are incorporated into a polymer film would be changed due to the external electric field . Similar behaviors have also been observed in other systems that comprise nanoparticles. − Therefore, we conclude that the electrical field introduced by the lateral Al electrodes in our experimental setup may have altered the optical characteristics of the PCBM molecules in the BLMs, leading to a phototransistor-like transmembrane current response that is regulated by the lateral bias.…”

Section: Results and Discussionsupporting

confidence: 82%

Modulation of Photoinduced Transmembrane Currents in a Fullerene-Doped Freestanding Lipid Bilayer by a Lateral Bias

Ma¹,

Feng²,

Ohori³

et al. 2019

ACS Omega

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We report on a novel lipid bilayer system, in which a lateral bias can be applied in addition to a conventional transmembrane voltage. Freestanding bilayer lipid membranes (BLMs) doped with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were formed in a microaperture, around which metal electrodes were deposited. Using this system, it was possible to modulate and amplify photoinduced transmembrane currents by applying a lateral bias along the BLM. The results indicate that the microfabricated Si chip with embedded electrodes is a promising platform for the formation of transistor-like devices based on PCBM-doped BLMs and have potential for use in a wide variety of nanohybrid devices.

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Section: Results and Discussionsupporting

confidence: 82%

Modulation of Photoinduced Transmembrane Currents in a Fullerene-Doped Freestanding Lipid Bilayer by a Lateral Bias

Ma¹,

Feng²,

Ohori³

et al. 2019

ACS Omega

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“…The result supports the formation of nanoparticles and hence an increase in band gap compared to bulk CdSe.Akey et al (2012) [115] have studied anomalous photoluminescence Stokes shift in CdSe nanoparticle and carbon nanotube hybrids. Nakabayashi et al [116] have investigated the external electric field effects on spectra and decay of photoluminescence (PL) as well as on absorption spectra of 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.…”

Section: Nanomaterialsmentioning

confidence: 99%

Luminescence of II-VI Semiconductor Nanoparticles

Chandra

Chandra²,

Jha

2014

SSP

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Nanoparticle or an ultrafine particle is a small solid whose physical dimension lies between 1 to 100 nanometers. Nanotechnology is the coming revolution in molecular engineering, and therefore, it is curiosity-driven and promising area of technology. The field of nanoscience and nanotechnology is interdisciplinary in nature and being studied by physicists, chemists, material scientists, biologists, engineers, computer scientists, etc. Research in the field of nanoparticles has been triggered by the recent availability of revolutionary instruments and approaches that allow the investigation of material properties with a resolution close to the atomic level. Strongly connected to such technological advances are the pioneering studies that have revealed new physical properties of matter at a level intermediate between atomic/molecular and bulk. Quantum confinement effect modifies the electronic structure of nanoparticles when their sizes become comparable to that of their Bohr excitonic radius. When the particle radius falls below the excitonic Bohr radius, the band gap energy is widened, leading to a blue shift in the band gap emission spectra, etc. On the other hand, the surface states play a more important role in the nanoparticles, due to their large surface-to-volume ratio with a decrease in particle size (surface effects). From the last few years, nanoparticles have been a common material for the development of new cutting-edge applications in communications, energy storage, sensing, data storage, optics, transmission, environmental protection, cosmetics, biology, and medicine due to their important optical, electrical, and magnetic properties.

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“…External electric field effects on optical spectra have been extensively used in molecular spectroscopy to examine electronic structures in the excited states. − The so-called electroabsorption (E-A) spectra provide unique information about the difference in electric dipole moment (μ) and molecular polarizability (α) between the ground state and the excited state. E-A measurements have been used by many research groups to investigate the electric-field effects on the electronic states in II–VI semiconductor QDs across the visible spectral range (400–800 nm), such as CdS, CdSe, ZnSe, CdS x Se 1– x , etc. − E-A spectra in the near-infrared region were also reported for PbS and PbSe. , Narrow transition line widths inherent in QDs, coupled with large Stark shift, should result in electro-optic modulation devices with even greater efficiency. In addition to possible device applications, the quantum-confined Stark effect (QCSE) can be used to prove the nature of the excited states of QDs.…”

Section: Introductionmentioning

confidence: 99%

Electroabsorption Spectra of Quantum Dots of PbS and Analysis by the Integral Method

2015

Self Cite

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Electroabsorption (E-A) spectra of semiconductor quantum dots (QDs) of PbS have been analyzed by the integral method, which is powerful not only to determine the change in electric dipole moment and/or polarizability following absorption precisely but also to confirm the weak absorption bands buried under other strong absorption bands. In the results, two weak absorption bands which induce blue-shift and red-shift, respectively, with application of electric fields have been newly confirmed in PbS QDs to be located just above the intense first exciton band. The energy separation between these two bands becomes smaller, as the applied field strength becomes stronger, suggesting that the interaction between the states excited by these transitions becomes weaker by application of electric fields. The QD size dependence has been reported both for the transition energy and for the magnitude of the change in electric dipole moment and molecular polarizability following the absorption of each band. The assignment of the absorption bands has also been discussed.

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

Cited by 14 publications

References 46 publications

Modulation of Photoinduced Transmembrane Currents in a Fullerene-Doped Freestanding Lipid Bilayer by a Lateral Bias

Modulation of Photoinduced Transmembrane Currents in a Fullerene-Doped Freestanding Lipid Bilayer by a Lateral Bias

Luminescence of II-VI Semiconductor Nanoparticles

Electroabsorption Spectra of Quantum Dots of PbS and Analysis by the Integral Method

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