Plasmon-enhanced homogeneous and heterogeneous triplet–triplet annihilation by gold nanoparticles

Chen, Xian; Hu, Bo; Ding, Rui; Zhang, Peng

doi:10.1039/c5cp01876e

Cited by 32 publications

(24 citation statements)

References 31 publications

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“…As a consequence of both the above processes, the singlet oxygen generation yields increase by about 10%. Our results are consistent with that reported by Cao et al 39 who have shown that the presence of Au-NPs enhanced the singlet oxygen generation of a dye conjugated with NPs relative to that in the system with a nonconjugated dye. The value of f D obtained in this study is lower than that of the rose bengal (RB) dye-Au-NP investigated system, 39 but we have a physical mixture of dyes and NPs whereas Au-NPs were conjugated with RB which influence the mechanism of ET and the possibility of the photoinduced electron transfer.…”

Section: Resultssupporting

confidence: 93%

“…It corresponds well to the course of quenching fluorescence and energy transfer dependencies. The value of f D obtained in this study is lower than that of the rose bengal (RB) dye-Au-NP investigated system, 39 but we have a physical mixture of dyes and NPs whereas Au-NPs were conjugated with RB which influence the mechanism of ET and the possibility of the photoinduced electron transfer. However, the results suggest that the perturbation to the local electromagnetic field in the system containing Au-NPs could enhance the spin-orbit coupling, i.e.…”

Section: Resultsmentioning

confidence: 56%

“…5 we can observe a gradual increase in f D with increasing concentration of Au-NPs. 39 who have shown that the presence of Au-NPs enhanced the singlet oxygen generation of a dye conjugated with NPs relative to that in the system with a nonconjugated dye. It seems that the Pheide-NPs interaction in the region of the Q y band could be neglected, when looking for the localization of NP absorption and Pheide emission bands.…”

Section: Resultsmentioning

confidence: 99%

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Multiwavelength excitation of photosensitizers interacting with gold nanoparticles and its impact on optical properties of their hybrid mixtures

Kotkowiak

Dudkowiak

2015

Phys. Chem. Chem. Phys.

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In a hybrid mixture of organic (dye) and inorganic (metallic nanoparticles) components, the optical properties of a dye can be easily controlled by tailoring the shape or the concentration of the noble metal nanoparticles (NPs). The influences of multiexcitation (multiwavelength excitation) of photosensitizers (pheophorbide a and hematoporphyrin) on the interactions with pegylated Au-NPs and on the photophysical parameters of the dyes are studied. Detailed, systematic fluorescence quenching studies were performed in the mixtures of different contents of Au-NPs, and interpreted together with the results of quantum singlet oxygen yield examinations. According to the results, the fluorescence of the two dyes studied was effectively quenched in the presence of Au-NPs, mainly because of the resonance energy transfer between the donor (dye) and the acceptor (Au-NPs). Stern-Volmer quenching constants were determined by a few orders of magnitude higher than those describing the photochemical quenching process. In hybrid mixtures analyzed, the mechanism of energy transfer between the donor and the acceptor was nanometal surface energy transfer. Furthermore, different behavior of the mixtures on excitation with the wavelengths from the Soret and Q bands of the dyes and with those corresponding to the surface plasmon resonance band of Au-NPs was analyzed. Moreover, for certain concentrations of Au-NPs and for certain excitation wavelengths, an increase in singlet oxygen generation was observed. The results obtained indicate the significance of further studies of photosensitizers in hybrid mixtures with NPs.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

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Multiwavelength excitation of photosensitizers interacting with gold nanoparticles and its impact on optical properties of their hybrid mixtures

Kotkowiak

Dudkowiak

2015

Phys. Chem. Chem. Phys.

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“…65 Alternatively, the excitation rate of the sensitizer and even the emission rate of the emitter may be enhanced by the presence of plasmonic resonances locally increasing the electric field. 66,67 The TTA-UC enhancement by plasmonic effect has been realized by Poorkazem et al , 68 Baluschev et al 69 and Xian et al 70 with significant increase in TTA-UC achieved.…”

Section: Discussionmentioning

confidence: 95%

Increased upconversion performance for thin film solar cells: a trimolecular composition

et al. 2016

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“…The fluorescence enhancement can be explained mainly by the acceleration of the radiative decay rate from the excited state by plasmon–exciton coupling as well as the photoexcitation enhancement. Recently, the emission generated via the TTA-UC phenomenon was successfully enhanced by the effect of the LSP resonance of noble metal nanoparticles. − Although the enhancement of the photoexcitation efficiency of sensitizer is expected to enhance the emission, the mechanism for the enhancement in the case of the TTA-UC systems is still unclear. The effect of LSP resonance on TTA-UC can be quite complex because TTA-UC includes complicated multiple photoinduced processes.…”

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confidence: 99%

Precise Control of Localized Surface Plasmon Wavelengths Is Needed for Effective Enhancement of Triplet–Triplet Annihilation-Based Upconversion Emission

et al. 2018

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In this study, we demonstrate that the localized surface plasmon (LSP) resonance of metal nanoparticles, depending strictly on the generating wavelength of LSP resonance, can have both beneficial enhancement and harmful quenching effects on a triplet–triplet annihilation-based upconversion (TTA-UC) emission. When the LSP resonance band of anisotropic silver nanoprisms spectrally overlapped with the photoexcitation wavelength of a sensitizer and the fluorescence of an emitter, an increase in the photoexcitation efficiency and an acceleration of the radiative decay rate were respectively induced, resulting in an effective enhancement in the TTA-UC emission. Furthermore, the overlapping with the photoexcitation wavelength led to a significant decrease (93%) in the threshold light excitation intensity, which greatly enhances the figure-of-merit in TTA-UC systems. However, when the LSP resonance band overlapped with the phosphorescence band of the sensitizer, the TTA-UC emission was extremely quenched, accompanied by the enhanced phosphorescence and the decreased phosphorescence lifetime. These results suggest that the decrease in the TTA-UC emission is a result of the competition between the triplet–triplet energy transfer to the emitter and the LSP-induced nonradiative energy transfer to the silver nanoprisms from the triplet-excited sensitizer. This discovery of the conflicting effects of LSP resonance provides an important guideline: a precise adjustment of LSP resonance wavelengths is needed for the efficient enhancement of TTA-UC emission. This requirement is different from those of other fluorescence systems such as single downconverted fluorophores and lanthanide-based upconversion nanoparticles.

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Plasmon-enhanced homogeneous and heterogeneous triplet–triplet annihilation by gold nanoparticles

Cited by 32 publications

References 31 publications

Multiwavelength excitation of photosensitizers interacting with gold nanoparticles and its impact on optical properties of their hybrid mixtures

Multiwavelength excitation of photosensitizers interacting with gold nanoparticles and its impact on optical properties of their hybrid mixtures

Increased upconversion performance for thin film solar cells: a trimolecular composition

Precise Control of Localized Surface Plasmon Wavelengths Is Needed for Effective Enhancement of Triplet–Triplet Annihilation-Based Upconversion Emission

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