The Experts below are selected from a list of 4818 Experts worldwide ranked by ideXlab platform
Yoshihiko Kanemitsu - One of the best experts on this subject based on the ideXlab platform.
-
photoluminescence enhancement and quenching of single cdse zns nanocrystals on metal surfaces dominated by plasmon Resonant Energy transfer
Applied Physics Letters, 2008Co-Authors: Kazunari Matsuda, Yuichi Ito, Yoshihiko KanemitsuAbstract:We studied the mechanism of the photoluminescence (PL) enhancement and quenching of single CdSe∕ZnS nanocrystals on rough Au surfaces. Single nanocrystal spectroscopy revealed that the PL enhancement depends strongly on the excitation wavelength and liner-polarization angle due to the localized plasmon excitation and is also sensitive to the nanocrystal size. The polarization- and size-dependent PL enhancement and quenching are determined by the balance between the Resonant Energy transfer from the nanocrystal to the Au surface and the electric field enhancement.
-
Photoluminescence enhancement and quenching of single CdSe∕ZnS nanocrystals on metal surfaces dominated by plasmon Resonant Energy transfer
Applied Physics Letters, 2008Co-Authors: Kazunari Matsuda, Yuichi Ito, Yoshihiko KanemitsuAbstract:We studied the mechanism of the photoluminescence (PL) enhancement and quenching of single CdSe∕ZnS nanocrystals on rough Au surfaces. Single nanocrystal spectroscopy revealed that the PL enhancement depends strongly on the excitation wavelength and liner-polarization angle due to the localized plasmon excitation and is also sensitive to the nanocrystal size. The polarization- and size-dependent PL enhancement and quenching are determined by the balance between the Resonant Energy transfer from the nanocrystal to the Au surface and the electric field enhancement.
Kazunari Matsuda - One of the best experts on this subject based on the ideXlab platform.
-
photoluminescence enhancement and quenching of single cdse zns nanocrystals on metal surfaces dominated by plasmon Resonant Energy transfer
Applied Physics Letters, 2008Co-Authors: Kazunari Matsuda, Yuichi Ito, Yoshihiko KanemitsuAbstract:We studied the mechanism of the photoluminescence (PL) enhancement and quenching of single CdSe∕ZnS nanocrystals on rough Au surfaces. Single nanocrystal spectroscopy revealed that the PL enhancement depends strongly on the excitation wavelength and liner-polarization angle due to the localized plasmon excitation and is also sensitive to the nanocrystal size. The polarization- and size-dependent PL enhancement and quenching are determined by the balance between the Resonant Energy transfer from the nanocrystal to the Au surface and the electric field enhancement.
-
Photoluminescence enhancement and quenching of single CdSe∕ZnS nanocrystals on metal surfaces dominated by plasmon Resonant Energy transfer
Applied Physics Letters, 2008Co-Authors: Kazunari Matsuda, Yuichi Ito, Yoshihiko KanemitsuAbstract:We studied the mechanism of the photoluminescence (PL) enhancement and quenching of single CdSe∕ZnS nanocrystals on rough Au surfaces. Single nanocrystal spectroscopy revealed that the PL enhancement depends strongly on the excitation wavelength and liner-polarization angle due to the localized plasmon excitation and is also sensitive to the nanocrystal size. The polarization- and size-dependent PL enhancement and quenching are determined by the balance between the Resonant Energy transfer from the nanocrystal to the Au surface and the electric field enhancement.
Akshay Rao - One of the best experts on this subject based on the ideXlab platform.
-
Resonant Energy transfer of triplet excitons from pentacene to pbse nanocrystals
Nature Materials, 2014Co-Authors: Maxim Tabachnyk, Bruno Ehrler, Simon Gélinas, Marcus L. Böhm, Brian J. Walker, Kevin P. Musselman, Neil C. Greenham, Richard H. Friend, Akshay RaoAbstract:The efficient transfer of Energy between organic and inorganic semiconductors is a widely sought after property, but has so far been limited to the transfer of spin-singlet excitons. Here we report efficient Resonant-Energy transfer of molecular spin-triplet excitons from organic semiconductors to inorganic semiconductors. We use ultrafast optical absorption spectroscopy to track the dynamics of triplets, generated in pentacene through singlet exciton fission, at the interface with lead selenide (PbSe) nanocrystals. We show that triplets transfer to PbSe rapidly (<1 ps) and efficiently, with 1.9 triplets transferred for every photon absorbed in pentacene, but only when the bandgap of the nanocrystals is close to resonance (±0.2 eV) with the triplet Energy. Following triplet transfer, the excitation can undergo either charge separation, allowing photovoltaic operation, or radiative recombination in the nanocrystal, enabling luminescent harvesting of triplet exciton Energy in light-emitting structures.
-
Resonant Energy transfer of triplet excitons from pentacene to PbSe nanocrystals
Nature materials, 2014Co-Authors: Maxim Tabachnyk, Bruno Ehrler, Simon Gélinas, Marcus L. Böhm, Brian J. Walker, Kevin P. Musselman, Neil C. Greenham, Richard H. Friend, Akshay RaoAbstract:The efficient transfer of Energy between organic and inorganic semiconductors is a widely sought after property, but has so far been limited to the transfer of spin-singlet excitons. Here we report efficient Resonant-Energy transfer of molecular spin-triplet excitons from organic semiconductors to inorganic semiconductors. We use ultrafast optical absorption spectroscopy to track the dynamics of triplets, generated in pentacene through singlet exciton fission, at the interface with lead selenide (PbSe) nanocrystals. We show that triplets transfer to PbSe rapidly (
Yuichi Ito - One of the best experts on this subject based on the ideXlab platform.
-
photoluminescence enhancement and quenching of single cdse zns nanocrystals on metal surfaces dominated by plasmon Resonant Energy transfer
Applied Physics Letters, 2008Co-Authors: Kazunari Matsuda, Yuichi Ito, Yoshihiko KanemitsuAbstract:We studied the mechanism of the photoluminescence (PL) enhancement and quenching of single CdSe∕ZnS nanocrystals on rough Au surfaces. Single nanocrystal spectroscopy revealed that the PL enhancement depends strongly on the excitation wavelength and liner-polarization angle due to the localized plasmon excitation and is also sensitive to the nanocrystal size. The polarization- and size-dependent PL enhancement and quenching are determined by the balance between the Resonant Energy transfer from the nanocrystal to the Au surface and the electric field enhancement.
-
Photoluminescence enhancement and quenching of single CdSe∕ZnS nanocrystals on metal surfaces dominated by plasmon Resonant Energy transfer
Applied Physics Letters, 2008Co-Authors: Kazunari Matsuda, Yuichi Ito, Yoshihiko KanemitsuAbstract:We studied the mechanism of the photoluminescence (PL) enhancement and quenching of single CdSe∕ZnS nanocrystals on rough Au surfaces. Single nanocrystal spectroscopy revealed that the PL enhancement depends strongly on the excitation wavelength and liner-polarization angle due to the localized plasmon excitation and is also sensitive to the nanocrystal size. The polarization- and size-dependent PL enhancement and quenching are determined by the balance between the Resonant Energy transfer from the nanocrystal to the Au surface and the electric field enhancement.
Terttu I. Hukka - One of the best experts on this subject based on the ideXlab platform.
-
Intermolecular Resonant Energy transfer of oligo(p-phenylenevinylene)–fullerene dyads: A theoretical study
Chemical Physics Letters, 2008Co-Authors: Teemu L.j. Toivonen, Terttu I. HukkaAbstract:Abstract Intermolecular Resonant Energy transfer (RET) of three different oligo( p -phenylenevinylene)–fullerene dyads (OPV n –MPC 60 ; n = 2–4) has been studied by using semiempirical computational methods. Sub-picosecond intermolecular Energy transfer comparable to intramolecular Energy transfer has been found to take place in horizontal and vertical directions between adjacent dyads. The results do not rule out the possibility that Energy transfer could precede charge separation in thin films made of OPV n –MPC 60 .
-
Intramolecular and intermolecular Resonant Energy transfer of a free-base tetraphenylporphyrin–fullerene dyad: A DFT and TDDFT study
Chemical Physics Letters, 2007Co-Authors: Teemu L.j. Toivonen, Terttu I. HukkaAbstract:Abstract Intramolecular and intermolecular Resonant Energy transfer (RET) of a free-base tetraphenylporphyrin– N -methyl-pyrrolidinofullerene (TPP–MPC 60 ) molecular dyad are studied by using the density functional theory (DFT) and the time-dependent DFT. The Fermi golden rule is used along with the extended dipole model to describe the electronic coupling in calculating the Energy transfer rates. Among the PBE, PBE0, and B3LYP functionals the PBE is observed to predict the experimentally observed intramolecular RET rate the best, as well as the spectroscopic properties of TPP. The PBE calculated intramolecular RET rate is of the same order of magnitude as the experimentally observed rate and is observed to be also almost the same as the intermolecular Energy transfer between two adjacent molecules.
-
A density functional theory (DFT) and time-dependent density functional theory (TDDFT) study on optical transitions in oligo(p-phenylenevinylene)-fullerene dyads and the applicability to Resonant Energy transfer.
The journal of physical chemistry. A, 2007Co-Authors: Teemu L.j. Toivonen, Terttu I. HukkaAbstract:The optical transitions of three different size oligo(p-phenylenevinylene)-fullerene dyads (OPV n -MPC 60 ; n = 2-4) and of the corresponding separate molecules are studied using density functional theory (DFT) and time-dependent density functional theory. The DFT is used to determine the geometries and the electronic structures of the ground states. Transition energies and excited-state structures are obtained from the TDDFT calculations. Resonant Energy transfer from OPV n to MPC 60 is also studied and the Fermi golden rule is used, along with two simple models to describe the electronic coupling to calculate the Energy transfer rates. The hybrid-type PBE0 functional is used with a split-valence basis set augmented with a polarization function (SV(P)) in calculations and the calculated results are compared to the corresponding experimental results. The calculated PBE0 spectra of the OPV n -MPC 60 dyads correspond to the experimental spectra very well and are approximately sums of the absorption spectra of the separate OPV n and MPC 60 molecules. Also, the absorption energies of OPV n and MPC 60 and the emission energies of OPV n are predicted well with the PBE0 functional. The PBE0 calculated Resonant Energy transfer rates are in a good agreement with the experimental rates and show the existence of many possible pathways for Energy transfer from the first excited singlet states of the OPV n molecules to the MPC 60 molecule.
