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Applied Nanophotonics || Energy transfer processes
摘要： In this chapter, we introduce the general phenomenon of excitation energy transfer, explain radiative and nonradiative types of energy transfer, and derive the basic processes of energy transfer. We look at the F?rster resonance energy transfer (FRET) in particular. We also describe Dexter energy transfer, charge transfer, exciton diffusion, and exciton dissociation. Finally, we summarize the modifications of FRET when using nanostructures with mixed dimensionalities and in different assemblies.
关键词： F?rster resonance energy transfer,nanostructures,FRET,charge transfer,exciton diffusion,energy transfer,Dexter energy transfer,exciton dissociation
更新于2025-09-10 09:29:36
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Energy Transfer from CdSe/ZnS Nanocrystals to Tetraphenyl Porphyrin
摘要： CdSe/ZnS nanocrystals (NCs) and Tetraphenyl Porphyrin (TPP) are mixed uniformly to prepare CdSe/ZnS NCs/TPP complex. TPP can quench the fluorescent signal of CdSe/ZnS NCs. UV-Vis absorption spectra and fluorescence spectra are employed to analysis the energy transfer. The mechanism of energy transfer is the F?rster resonance energy transfer from CdSe/ZnS to TPP.
关键词： Tetraphenyl Porphyrin,energy transfer,CdSe/ZnS nanocrystals,F?rster resonance energy transfer
更新于2025-09-10 09:29:36
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[IEEE 2018 EMF-Med 1st World Conference on Biomedical Applications of Electromagnetic Fields (EMF-Med) - Split, Croatia (2018.9.10-2018.9.13)] 2018 EMF-Med 1st World Conference on Biomedical Applications of Electromagnetic Fields (EMF-Med) - Design of an Experimental Setup for Freely Positionable Coil Pairs for Transcutaneous Energy Transfer Systems
摘要： Mechanical circulatory support systems (MCSS), such as the left ventricular assist device (LVAD), still employ percutaneous drive-lines for the power supply of implanted components. Transcutaneous energy transfer (TET) offers the possibility to reduce drive-line related infections, but also improve patients’ every day life. In this paper, an experimental setup is presented, that allows the determination of the coupling factor and the verification of positioning tolerant approaches of coil systems. The setup is developed with the particular requirements for the application regarding the positioning of the coils. Measurements show a very good agreement against an analytical approach for the calculation of the coupling factor.
关键词： Transcutaneous energy transfer,Coupled coil modeling,Inductive power transfer
更新于2025-09-10 09:29:36
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Design of Novel Pyrene-Bodipy Dyads: Synthesis, Characterization, Optical Properties, and FRET Studies
摘要： A new series of dendronized bodipys containing pyrene units was synthesized and characterized. Their optical and photophysical properties were determined by absorption and ?uorescence spectroscopy. This series includes three different compounds. The ?rst one has an anisole group linked to the bodipy unit, which was used as the reference compound. In the second, the bodipy core is linked to a zero generation dendron with one pyrene unit. The third In this compound contains a ?rst generation Fréchet-type dendron bearing two pyrene units. work, the combination pyrene-bodipy was selected as the donor-acceptor pair for this ?uorescence resonance energy transfer (FRET) study. Doubtless, these two chromophores exhibit high quantum yields, high extinction coef?cients, and both their excitation and emission wavelengths are located in the visible region. This report presents a FRET study of a novel series of pyrene-bodipy dendritic molecules bearing ?exible spacers. We demonstrated via spectroscopic studies that FRET phenomena occur in these dyads.
关键词： ?uorescence resonance energy transfer (FRET),pyrene,bodipy
更新于2025-09-10 09:29:36
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A multicolor large Stokes shift fluorogen-activating RNA aptamer with cationic chromophores
摘要： Large Stokes shift (LSS) fluorescent proteins (FPs) exploit excited state proton transfer pathways to enable fluorescence emission from the phenolate intermediate of 4-hydroxybenzylidene imidazolone (HBI) chromophore. An RNA aptamer named Chili mimics LSS FPs by inducing highly Stokes-shifted emission from several new green and red HBI analogs that are non-fluorescent when free in solution. The ligands are bound by the RNA in their protonated phenol form and feature a cationic aromatic side chain for increased RNA affinity and reduced magnesium dependence. In combination with oxidative functionalization at the C2 position of the imidazolone, this strategy yielded DMHBO+, which binds to the Chili aptamer with a low-nanomolar KD. Because of its highly red-shifted fluorescence emission at 592 nm, the Chili–DMHBO+ complex is an ideal fluorescence donor for F?rster resonance energy transfer (FRET) to the rhodamine dye Atto 590 and will therefore find applications in FRET-based analytical RNA systems.
关键词： RNA aptamer,fluorescence,fluorescence resonance energy transfer,fluorescent protein,large Stokes shift
更新于2025-09-10 09:29:36
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Multiplexed determination of intracellular messenger RNA by using a graphene oxide nanoprobe modified with target-recognizing fluorescent oligonucleotides
摘要： A multiplexed graphene oxide (GO) fluorescent nanoprobe is described for quantification and imaging of messenger RNAs (mRNAs) in living cells. The recognizing oligonucleotides (with sequences complementary to those of target the fluorescence of the recognizing mRNAs) were labeled with different fluorescent dyes. If adsorbed on GO, oligonucleotides is quenched. After having penetrated living cells, the oligonucleotides bind to target mRNAs and dissociate from GO. This leads to the recovery of fluorescence. Using different fluorescent dyes, various intracellular mRNAs can be simultaneously imaged and quantified by a high content analysis within a short period of time. Actin mRNA acts as the internal control. This GO-based nanoprobe allows mRNA mimics to be determined within an analytical range from 1 to 400 nM and a detection limit as low as 0.26 nM. Up to 3 intracellular mRNAs (C-myc, TK1, and actin) can be detected simultaneously in a single living cell. Hence, this nanoprobe enables specific distinction of intracellular mRNA expression levels in cancerous and normal cells. It can be potentially applied as a tool for detection of cancer progression and diagnosis.
关键词： Fluorescence resonance energy transfer (FRET),Cancer biomarker,Actin mRNA,Fluorometric detection,High content analysis,Cancer diagnosis
更新于2025-09-10 09:29:36
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A ratiometric fluorescent probe for lysosomal hypochlorous acid based on through-bond energy transfer strategy
摘要： In this paper, we synthesized a ratiometric fluorescence probe (IRh-Ly) for lysosomal hypochlorous acid (HOCl) by adopting a through-bond energy transfer (TBET) strategy on rhodamine-imidazo[1,5-a]pyridine platform. IRh-Ly showed brilliant selectivity, rapid response for HOCl. The probe also exhibited high sensitivity with the detection limit calculated to be 10.2 nM. Moreover, we demonstrated its successful application of detecting lysosomal HOCl in living RAW264.7 cells. Notably, the morpholine was integrated into the fluorescent probe IRh-Ly and the results revealed that IRh-Ly could target lysosome and detect the lysosomal HOCl. All the unique features made IRh-Ly particularly suitable for ratiometric HOCl detection and bio-imaging applications.
关键词： Through-bond energy transfer,HOCl,Lysosomal,Ratiometric,Fluorescent probe
更新于2025-09-10 09:29:36
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A novel protein binding strategy for energy-transfer-based photoelectrochemical detection of enzymatic activity of botulinum neurotoxin A
摘要： In this work, we propose a novel energy-transfer-based photoelectrochemical (PEC) platform for probing of protein-protein interaction, which associates intimately with zinc-dependent cleavage and substrate specificities in the enzymatic activities of botulinum neurotoxin (BoNT). Specifically, by using substrate protein SNAP-25 as the energy-transfer nanoprobe, an exciton-plasmon interaction (EPI) based strategy between CdS quantum dots (QDs) and Au nanoparticles (NPs) in a PEC system is constructed with the photocurrent declining. Interestingly, the EPI effect is then interrupted by the target botulinum neurotoxin serotype A light chain (BoNT-LCA) special cleavage of the probe SNAP-25, leading to the photocurrent recovery. Therefore, the enzymatic activity of BoNT-LCA could be sensitively detected with a detection limit of 1 pg/mL. Unlike conventional DNA-programable assembly, a protein probe is used to bridge the excitons and plasmons in this work, which provides a new route for the investigation of the EPI-based bioassay.
关键词： CdS QDs,Exciton–plasmon interaction,Energy transfer,Botulinum neurotoxin A,Photoelectrochemical detection
更新于2025-09-10 09:29:36
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Effect of linear energy transfer on the scintillation properties of Ce:Gd3Al2Ga3O12
摘要： We analyzed the scintillation properties of Ce:Gd3Al2Ga3O12 (GAGG), which are dependent on linear energy transfer (LET). The rise in the scintillation temporal profiles was slow at high LET, whereas the decay did not significantly depend on LET. The slow rise at high LET could be explained as follows. Competition among multiple excited states for energy transfer to a nearby Ce3+ ion led to failure in energy transfer for some of the excited states. Subsequent competition occurred among the residual excited states for energy transfer to the Ce3+ ions located far from the original position of the excited states, followed by quenching.
关键词： Excitation density,Energy transfer,Quenching,Scintillation
更新于2025-09-10 09:29:36
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Efficient blue phosphorescent organic light emitting diodes based on exciplex and ultrathin Firpic sandwiched layer
摘要： The high efficient blue phosphorescent organic light emitting diodes (PHOLEDs) employing ultrathin Firpic layer sandwiched between electron donor mCP and electron acceptor TmPyPB layers were fabricated, and the dependence of the electroluminescence (EL) performance on the ultrathin Firpic layer thickness were investigated. It was found that the Firpic layer thickness imposed vital influence on the OLEDs EL efficiency and the one with the 0.3nm Firpic demonstrated the optimal power efficiency (PE) of 50 lm/w and the external quantum efficiency (EQE) close to 18%. The sandwiched ultrathin Firpic layer would not impede the formation of the exciplex between mCP and TmPyPB, and the balance between the exciplex formation and exciplex decaying showed strong dependence on Firpic layer thickness and imposed vital influence on the energy transfer, fluorescence and phosphorescence inside the emissive layer. There were three radiative decaying processes involved, i.e. the prompt and delayed fluorescence (PF and DF) of the exciplex as well as the phosphorescence (PH) of the Firpic, and the final EL relied on the competition of those processes. The optimal EL performance might be attributed to the combining benefits of the balanced PF, DF and PH decaying, alleviated Dexter-transfer-based triplet-triplet annihilation (TTA) and the triplets diffusion suppressed architecture.
关键词： ultrathin,energy transfer,exciplex,TTA
更新于2025-09-10 09:29:36